WO2020137674A1 - アルミニウム電解コンデンサ用セパレータおよびアルミニウム電解コンデンサ - Google Patents
アルミニウム電解コンデンサ用セパレータおよびアルミニウム電解コンデンサ Download PDFInfo
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- WO2020137674A1 WO2020137674A1 PCT/JP2019/049318 JP2019049318W WO2020137674A1 WO 2020137674 A1 WO2020137674 A1 WO 2020137674A1 JP 2019049318 W JP2019049318 W JP 2019049318W WO 2020137674 A1 WO2020137674 A1 WO 2020137674A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
- H01G9/151—Solid electrolytic capacitors with wound foil electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/02—Diaphragms; Separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/52—Separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
- H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/145—Liquid electrolytic capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Definitions
- the present invention relates to a separator for an aluminum electrolytic capacitor and an aluminum electrolytic capacitor using the separator.
- An aluminum electrolytic capacitor using a conductive polymer as a cathode material (hereinafter referred to as “solid electrolytic capacitor”) is an electrolytic solution containing a cathode material.
- solid electrolytic capacitor is an electrolytic solution containing a cathode material.
- ESR equivalent series resistance
- the conduction mechanism of a non-solid electrolytic capacitor using an electrolytic solution is ionic conduction, but the conduction mechanism of a solid electrolytic capacitor is electronic conduction, which is higher in conductivity than ionic conduction. In other words, since it has a good responsiveness to release the stored electrons, it has a low ESR characteristic and is advantageous as a capacitor used around the CPU in the power supply circuit.
- hybrid electrolytic capacitor a conductive polymer hybrid aluminum electrolytic capacitor that uses both a conductive polymer and an electrolytic solution as a cathode material has been put on the market by capacitor maker companies. It has also been used for automotive electrical equipment applications where low ESR characteristics and absence of short-circuit defects are essential requirements.
- a solid electrolytic capacitor is formed by stacking an electrode foil and a separator and winding them to form an element winding, then repairing the defective portion of the aluminum oxide film of the electrode foil, and cutting surface of the electrode foil and unformed portions such as tabs. After conducting chemical conversion to form a conductive polymer layer, the conductive polymer layer is inserted and sealed in a case.
- the hybrid electrolytic capacitor is manufactured by forming a conductive polymer layer, further impregnating it with an electrolytic solution, inserting it into a case, and sealing it.
- a solution containing a monomer and an oxidant hereinafter referred to as a “polymerization solution”
- a polymerization solution a solution containing a monomer and an oxidant
- a layer is formed within the capacitor element.
- the capacitor element is impregnated with a suspension of the conductive polymer in water (hereinafter referred to as “dispersion liquid”), which is then heated and dried to reduce the conductivity.
- a polymer layer is formed within the capacitor element.
- the formation state of the conductive polymer layer inside the capacitor element is not good, that is, the impregnating property of the separator for the polymerization liquid and the dispersion liquid is the electric potential of the solid electrolytic capacitor and the hybrid electrolytic capacitor. It will determine the characteristics.
- ECUs electronice control units
- parts used in automobiles may be subject to external vibration or shock as compared with parts used in personal computers and home-use game consoles, and capacitors used there may be exposed to harsh environments for long periods of time. It is required to have short-circuit resistance so that it can withstand all over. Therefore, the separator used in those capacitors is required to have a high shielding property between both electrodes.
- Patent Document 1 one or more kinds of natural fiber pulp or regenerated cellulose fiber is used as a raw material, and by using an electrolytic paper having a two-layer structure of a high density layer and a low density layer, a high withstand voltage is maintained.
- an electrolytic capacitor having improved impedance characteristics is disclosed.
- Patent Document 2 has a two-layer structure consisting of a long-net or short-net paper-making fiber layer A and a cylinder-paper making fiber layer B containing 70% by mass or more of a beating regenerated cellulose fiber.
- a separator that has been proposed is proposed. There is disclosed a technique of providing an electricity storage device capable of improving productivity without adversely affecting internal resistance and leakage current characteristics by using this separator.
- Patent Document 3 by incorporating acrylic short fibers and fibrillated cellulose, it is possible to improve the impregnation property of the conductive polymer polymerization liquid, and as a result, a solid that can achieve low ESR.
- a technique for providing a separator for an electrolytic capacitor is disclosed.
- Patent Document 4 proposes a solid electrolytic capacitor using a nonwoven fabric containing a polyester resin or its derivative produced by a wet method. Since this separator has excellent solid electrolyte adhesion and adhesiveness, and has high physical strength and heat resistance, a technique for providing a solid electrolytic capacitor having excellent impedance characteristics and leakage current characteristics by using this separator is disclosed. ing.
- Patent Document 5 discloses a non-woven fabric layer (I layer) made of ultrafine fibers having a fiber diameter of 0.1 to 4 ⁇ m and a fiber layer (II layer) made of thermoplastic resin fibers having a fiber diameter of 6 to 30 ⁇ m. ), and the non-woven fabric layer (II layer) is present between two non-woven fabric layers (I layer).
- a technique for providing a higher performance solid electrolytic capacitor by using this separator is disclosed.
- the separator as disclosed in Patent Document 1 is composed of only cellulose fibers, and when impregnated with a polymerization liquid or a dispersion liquid of a conductive polymer used in a solid electrolytic capacitor, the cellulose fibers are gradually decomposed under acidic conditions. Therefore, the mechanical strength of the separator may be significantly reduced, or the polymerization of the conductive polymer may be hindered by the reaction between the cellulose fiber and the oxidizing agent of the polymerization liquid.
- the high-density layer was extremely dense, making it difficult to impregnate the conductive polymer polymerization liquid or dispersion liquid. Therefore, when the mechanical strength of the separator is reduced, short-circuit failure of the solid electrolytic capacitor is increased, or the impregnating property of the conductive polymer polymerization liquid or dispersion liquid is deteriorated. Was sometimes worse.
- the separator of Patent Document 1 is blended with synthetic fibers in order to prevent the mechanical strength of the conductive polymer against a polymerization liquid or a dispersion liquid from falling, the synthetic fibers intervene between the cellulose fibers to cause the cellulose By inhibiting hydrogen bonding between the fibers, the mechanical strength of the separator may be reduced, which may cause a problem such as breakage during separator formation or during capacitor element formation.
- the gap between the fibers constituting the separator becomes excessively wide, resulting in a denseness. In some cases, the number of short circuits increased and the number of short circuit defects increased.
- a separator containing regenerated cellulose fibers having fibrils having a small fiber diameter as in Patent Document 2 has very high denseness and high shielding property, and thus has excellent short-circuit resistance, but high denseness.
- regenerated cellulose is a fiber obtained by dissolving and spinning cellulose, and the degree of polymerization of cellulose is lower than that of natural cellulose fiber, so that the resistance to the conductive polymer polymerization liquid or dispersion is further reduced, The decrease in mechanical strength of the separator may increase short-circuit failure of the capacitor.
- the separator of Patent Document 2 If the density of the separator of Patent Document 2 is lowered and the amount of the non-fibrillated fiber is increased for the purpose of reducing ESR and improving electrostatic capacity, the separator becomes less dense, resulting in an electrode foil. Burr or the like easily penetrates the separator, and the solid electrolytic capacitor using this separator has low short-circuit resistance.
- the synthetic fibers when synthetic fibers are blended in order to avoid a decrease in the mechanical strength of the polymer or the dispersion liquid of the conductive polymer, the synthetic fibers intervene between the cellulose fibers to prevent hydrogen bonds between the cellulose fibers. Due to the inhibition, the mechanical strength of the separator may be lowered, and a problem such as breakage may occur during the formation of the separator or the formation of the capacitor element.
- the separator containing acrylic short fibers as in Patent Document 3 has a high impregnation property, but has a low denseness, and thus is excellent in low ESR, but has a problem of low short resistance. If the density of the separator of Patent Document 3 is increased and the amount of fibrillated fibers is increased for the purpose of improving short-circuit resistance, the density of the separator is increased, resulting in a polymerization liquid of a conductive polymer. In addition, the impregnation property of the dispersion liquid is deteriorated, and the ESR characteristics and the electrostatic capacity cannot be improved.
- the separator of Patent Document 5 is made high in density and the non-woven fabric layer composed of ultrafine fibers having a fiber diameter of 0.1 to 4 ⁇ m is used for the purpose of improving short-circuit resistance, the separator is It becomes too dense and impregnates the polymerization liquid or dispersion liquid of the conductive polymer, making it impossible to reduce ESR and improve electrostatic capacity.
- the conventional separator cannot maintain the high short-circuit resistance in the solid electrolytic capacitor and the hybrid electrolytic capacitor, and cannot meet further demands for further reduction of ESR and improvement of electrostatic capacitance. There's a problem.
- the present invention has been made in view of the above problems, and a separator that can be used in a solid electrolytic capacitor and a hybrid electrolytic capacitor to reduce ESR and improve capacitance while maintaining high short-circuit resistance.
- Another object of the present invention is to provide a solid electrolytic capacitor and a hybrid electrolytic capacitor using the separator.
- the embodiment according to the present invention has the following configuration, for example. That is, a separator for an aluminum electrolytic capacitor interposed between a pair of electrodes, containing a synthetic fiber, the droplet disappearance time on one surface and the opposite surface is 10 to 350 seconds, and the ratio of the droplet disappearance times is It is characterized by being 1.0 to 2.0.
- the synthetic fiber is a polyamide fiber.
- the polyamide fiber is a fibrillated polyamide fiber.
- the synthetic fiber is composed only of fibrillated fibers.
- the synthetic fiber is characterized by containing 20 to 80% by mass of fibrillated polyamide fiber and 20 to 80% by mass of fibrillated natural cellulose fiber.
- the cathode material is made of a conductive polymer.
- the present invention it is possible to obtain a separator having a high impregnation property with respect to a conductive polymer polymerization liquid or dispersion liquid while maintaining a high shielding property.
- this separator in a solid electrolytic capacitor and a hybrid electrolytic capacitor, it is possible to reduce ESR and improve electrostatic capacitance while maintaining short-circuit resistance.
- the droplet disappearance time of one side surface and the opposite side surface of the separator is constant.
- the gap between the fibers forming the separator can be appropriately formed, and thus the impregnating property of the conductive polymer polymerization liquid or dispersion liquid can be enhanced while maintaining the shielding property. Therefore, as the separator, the ESR can be reduced and the capacitance can be improved while maintaining the short-circuit resistance.
- the airtightness of the separator described above the average pore diameter within a certain range, it is possible to control the denseness of the separator, without impairing the impregnating property of the conductive polymer polymerization liquid or dispersion liquid, High short resistance can be maintained. Further, by using the above-mentioned synthetic fiber as a polyamide fiber, the heat resistance and chemical resistance of the separator can be improved.
- the homogeneity of the separator can be increased and the short-circuit resistance can be improved. Furthermore, by configuring the above-described separator with only fibrillated fibers, the denseness of the entire separator can be increased and the short-circuit resistance can be improved.
- the separator described above contains 20 to 80% by mass of fibrillated polyamide fiber and 20 to 80% by mass of fibrillated natural cellulose fiber, so that the conductive polymer is polymerized or dispersed in the dispersion liquid. It is possible to achieve both resistance and mechanical strength.
- a separator according to an embodiment of the present invention is a separator for an aluminum electrolytic capacitor interposed between a pair of electrodes, the separator containing synthetic fibers and droplets on one surface and the other surface of the separator. Particularly good results are obtained by controlling the disappearance time to 10 to 350 seconds and the ratio of the droplet disappearance times to 1.0 to 2.0.
- Droplet disappearance time on one side surface and the opposite side surface of the separator indicates the wettability and spreadability of the conductive polymer polymerization liquid or dispersion liquid of the separator.
- the droplet disappearance time on one surface and the opposite surface of the separator is preferably in the range of 10 to 350 seconds, more preferably in the range of 10 to 250 seconds, and further preferably in the range of 10 to 200 seconds.
- the conductive polymer layer serving as an electron conduction path is not uniformly formed.
- the gap between the fibers is excessively dense, and therefore the conductive polymer polymerization liquid or dispersion liquid is not impregnated into the separator, and the conductive polymer becomes an electron conduction path. No layers can be formed. Therefore, in both cases where the liquid droplet disappearance time on one surface and the other surface of the separator is less than 10 seconds and more than 350 seconds, the ESR is reduced and the electrostatic capacity is improved when the solid electrolytic capacitor and the hybrid electrolytic capacitor are used. I can't let you do it.
- the ratio of the drop disappearance times of the separator indicates the homogeneity of the fibrous structure on the surface and inside the separator.
- the ratio of the liquid droplet disappearance time of the separator is preferably in the range of 1.0 to 2.0, more preferably in the range of 1.0 to 1.5. If the ratio of droplet disappearance times exceeds 2.0, the gaps between the fibers that form the surface of the separator and the inside of the separator become sparse, the homogeneity of the entire separator is low, and the polymerization liquid or dispersion liquid of the conductive polymer is low. Impregnation becomes uneven, and the conductive polymer layer serving as an electron conduction path is not uniformly formed. For this reason, when the ratio of the liquid droplet disappearance time is more than 2.0, it is impossible to reduce the ESR and improve the capacitance when the solid electrolytic capacitor and the hybrid electrolytic capacitor are used.
- the acid resistance and oxidation resistance of the separator can be improved, and the decrease in mechanical strength of the separator due to the polymerization liquid or dispersion liquid of the conductive polymer can be suppressed. Furthermore, since synthetic fibers do not develop hydrogen bonds between fibers like natural cellulose fibers, it is possible to prevent the gap between fibers from being excessively blocked, so that the conductive polymer layer is uniformly formed over the entire separator. be able to.
- the separator of the embodiment for carrying out the present invention preferably has a separator airtightness in the range of 10 to 350 seconds/100 ml, considering the impregnation property of the conductive polymer polymerization liquid and the dispersion liquid and the short resistance.
- the range is preferably 10 to 250 seconds/100 ml, and more preferably 10 to 200 seconds/100 ml.
- the average pore size of the separator is preferably in the range of 0.1 to 15.0 ⁇ m, more preferably 0.1 to 10 ⁇ m.
- the denseness of the separator can be controlled. If the airtightness of the separator is less than 10 seconds/100 ml and the average pore size exceeds 15.0 ⁇ m, the separator may not have sufficient denseness, and burrs or the like of the electrode foil may easily penetrate the separator. is there. If the separator has an airtightness of more than 350 seconds/100 ml and an average pore size of less than 0.1 ⁇ m, the separator is excessively dense, which makes it difficult to impregnate the polymer with the conductive polymer polymerization liquid or the dispersion liquid. When it is used as a hybrid electrolytic capacitor, it may not be possible to reduce the ESR and improve the electrostatic capacity.
- the synthetic fiber type constituting the separator is preferably polyamide fiber. Furthermore, by using fibrillated polyamide fiber as the polyamide fiber, the homogeneity of the separator can be enhanced.
- the binder effect of the fibrillated polyamide fiber is not particularly limited as long as the droplet disappearance time and the droplet disappearance time ratio between the one surface and the opposite surface of the separator can be satisfied.
- the separator is composed of only fibrillated fibers capable of enhancing the denseness of the entire separator.
- the fibrillated fibers constituting the separator preferably contain 20 to 80% by mass of fibrillated polyamide fibers and 20 to 80% by mass of fibrillated natural cellulose fibers.
- the fibrillated polyamide fiber By containing 20 to 80% by mass of the fibrillated polyamide fiber, acid resistance and oxidation resistance of the separator are improved, and it is possible to suppress a decrease in mechanical strength of the separator due to a polymerization liquid or dispersion liquid of a conductive polymer.
- the content of the fibrillated polyamide fiber is less than 20% by mass, that is, when the content of the fibrillated natural cellulose fiber exceeds 80% by mass, the acid resistance and the oxidation resistance of the separator are deteriorated, and the conductive polymer is polymerized.
- the mechanical strength of the separator after impregnation with the dispersion liquid may decrease, and the short-circuit defect rate of the capacitor may increase.
- the content of the fibrillated polyamide fiber is more than 80% by mass, that is, when the content of the fibrillated natural cellulose fiber is less than 20% by mass, a polymerization liquid or a dispersion liquid of the conductive polymer of the separator due to the action of the hydroxyl group. Affinity with the conductive polymer layer is reduced, the conductive polymer layer cannot be formed uniformly inside the capacitor element, and the ESR cannot be reduced and the electrostatic capacity cannot be improved.
- the mechanical strength of the separator is reduced by the fibrillated polyamide fiber which is a synthetic fiber to inhibit hydrogen bonding between the cellulose fibers, and when a winding failure such as a separator cut in the capacitor element winding step occurs, or The burrs of the electrode foil may easily penetrate the separator, which may increase the short-circuit defect rate of the capacitor.
- fibrillated polyamide fibers constituting the separator fibrillated aramid fibers are preferable from the viewpoint of heat resistance.
- the fibrillated natural cellulose fiber material is not particularly limited, and for example, a chemical pulp for papermaking which is obtained by digesting wood or non-wood with a sulfate (craft) method, a sulfite method, or an alkali method, and extracting it can be used. .. Among them, jute pulp, sisal hemp pulp, and Manila hemp pulp are preferable as the natural cellulose fiber from the viewpoint of the mechanical strength of the separator and the impregnation property of the polymerization liquid or dispersion liquid of the conductive polymer.
- a chemical pulp for papermaking which is obtained by digesting wood or non-wood with a sulfate (craft) method, a sulfite method, or an alkali method, and extracting it can be used. .. Among them, jute pulp, sisal hemp pulp, and Manila hemp pulp are preferable as the natural cellulose fiber from the viewpoint of the mechanical strength of the separator and the impregnation property of the polymerization liquid
- the fibrils are, for example, whisker-like filaments that are thinner than the original fibers and are generated when the fibers are processed by a mechanical external force or the like.
- means for fibrillating fibers include beating treatment.
- the equipment used for beating the fibers is not particularly limited. Generally, a beater, a conical refiner, a disc refiner, a high pressure homogenizer and the like can be mentioned.
- the fibers used in the present embodiment may be beaten independently and mixed before papermaking, or the mixed fibers may be beaten.
- the CSF value of the fibers constituting the separator was set in the range of 0 to 500 ml.
- the CSF value of the fibers constituting the separator is not particularly limited as long as sufficient mechanical strength can be imparted to the separator and uniform formation can be achieved.
- a wet heat fusion resin such as polyvinyl alcohol or a paper strengthening agent such as polyacrylamide
- the content of the binder material is not particularly limited as long as the desired droplet disappearance time between the one surface and the opposite surface of the separator and the ratio of the droplet disappearance time can be satisfied. It is unlikely to affect the impregnation properties of the molecular polymerization liquid or dispersion liquid.
- the thickness and density of the separator can be any thickness and density in consideration of the droplet disappearance time and the ratio of the droplet disappearance time between the one surface and the opposite surface of the separator.
- the thickness is 20 to 70 ⁇ m and the density is about 0.200 to 0.600 g/cm 3
- the ratio of the droplet disappearance time and the droplet disappearance time between the one surface and the opposite surface of the separator is preferable. It is easy to set the range, but it is not limited to this range.
- the separator of the present embodiment preferably has a tensile strength of 7.0 N/15 mm or more. If the tensile strength is lower than 7.0 N/15 mm, the separator is likely to break during the formation of the separator and the formation of the capacitor. In addition, burrs of the electrode foil easily penetrate the separator, and the short-circuit resistance is also reduced.
- the separator employs a wet non-woven fabric formed by a papermaking method.
- the paper making format of the separator is not particularly limited as long as it can satisfy the droplet disappearance time between the one side surface and the opposite side surface of the separator, and the ratio of the droplet disappearance time.
- papermaking methods can be used, for example, by having a multilayer structure such as stacking layers formed by these papermaking methods, the gap between the fibers can be more appropriately formed, while maintaining the shielding property, It is possible to further enhance the impregnation property of the conductive polymer polymerization liquid or dispersion liquid.
- the CSF value of the fibers constituting the fiber layer A is set to 0 to 100 ml to obtain the conductive property. It is possible to enhance the shielding property while maintaining the impregnation property of the polymer liquid or the dispersion liquid of the functional polymer. Further, by setting the CSF value of the fibers constituting the fiber layer B to 100 ml or more and 500 ml or less, it is possible to enhance the impregnating property of the conductive polymer polymerization liquid or dispersion liquid while maintaining the shielding property.
- the strain at the interface between the fiber layers A and B is small, and the fibers are formed inside the separator.
- the conductive polymer layer can be formed more uniformly.
- an additive such as a dispersant, a defoaming agent, or a paper strengthening agent may be added as long as the content of impurities is such that the separator for capacitors is not affected.
- Post-processing such as enhancement processing, lyophilic processing, calendar processing, embossing processing may be performed.
- the method is not limited to the wet non-woven fabric produced by the papermaking method, and there is no problem in the method of forming a film by casting the fiber dispersion liquid as used in the film forming method.
- the separator having the above structure is used as the separator, the separator is interposed between the pair of electrodes, and the conductive polymer is used as the cathode material.
- the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator according to the embodiment of the present invention having the above-described configuration have a high impregnation property with respect to the polymer liquid or the dispersion liquid of the conductive polymer while maintaining the high shielding property.
- CSF The CSF is "JIS P8121-2 "Pulp-Freeness Test Method-Part 2: Canadian Standard Freeness Method”” (ISO5267-2 "Pulps-Determination of drainability-Part 2: “Canadian Standard” freeness method”). Was measured according to.
- the ratio of the droplet disappearance time was calculated by dividing the value of the larger one of the droplet disappearance times of the one surface and the other surface of the separator by the smaller value of the separators.
- the droplet disappearance time was measured at room temperature of 20° C. and relative humidity of 65%.
- the average pore size of the separator was determined from the pore size distribution measured by the bubble point method (ASTMF316-86, JIS K3832) using PMI's Parm-Porometer. GALWICK (Porous Materials, Inc.) was used as a test solution for the measurement of the average pore diameter.
- a hybrid electrolytic capacitor with a rated voltage of 16V After impregnating the capacitor element with the conductive polymer polymerization liquid, heat and polymerize it and dry the solvent to form the conductive polymer layer.
- a conductive polymer layer is formed by impregnating the capacitor element with the conductive polymer dispersion, followed by heating and drying. Then, the capacitor element was impregnated with a driving electrolytic solution, the capacitor element was placed in a predetermined case, the opening was sealed, and then aging was performed to obtain each hybrid electrolytic capacitor.
- ESR ESR of the manufactured capacitor element was measured using an LCR meter under the conditions of a temperature of 20° C. and a frequency of 100 kHz.
- Capacitance The electrostatic capacity was determined by the method of "4.7 electrostatic capacity" specified in "JIS C 5101-1 "Fixed capacitors for electronic devices Part 1: General rules for each item"".
- the short-circuit defect rate is obtained by counting the number of short-circuit defects that occurred during aging using wound capacitor elements, dividing the number of short-circuit failure elements by the number of capacitor elements that have been aged, and performing a short circuit with a percentage. It was defined as a defective rate.
- Table 1 shows the raw materials and formulations of the separators of Examples 1 to 7, Reference Examples 1 to 4, Comparative Examples 1 to 3 and Conventional Examples 1 to 5, and Table 2 shows the evaluation results of each separator alone. .. Further, Table 3 shows the performance evaluation results of the solid electrolytic capacitors using the separators shown in Tables 1 and 2, and Table 4 shows the performance evaluation results of the hybrid electrolytic capacitors using the separators shown in Tables 1 and 2.
- Example 1 A CSF value of 400 ml obtained by mixing 80% by mass of fibrillated aramid fiber and 20% by mass of fibrillated natural cellulose fiber as a raw material having a CSF value of 0 ml, and 80% by mass of fibrillated aramid fiber and 20% by mass of fibrillated natural cellulose fiber. The raw materials of and were used to make a cylinder net paper to prepare a two-layer separator of Example 1.
- the thickness of the completed separator of Example 1 is 20 ⁇ m, the density is 0.500 g/cm 3 , the tensile strength is 9.8 N/15 mm, the droplet disappearance time is 17 seconds on one side surface, 10 seconds on the opposite side surface, and the droplet is The disappearance time ratio was 1.7, the airtightness was 280 seconds/100 ml, and the average pore size was 0.1 ⁇ m.
- Example 2 A CSF value of 300 ml obtained by mixing 20% by mass of fibrillated aramid fiber and 80% by mass of fibrillated natural cellulose fiber as a raw material having a CSF value of 20 ml, and 20% by mass of fibrillated aramid fiber and 80% by mass of fibrillated natural cellulose fiber. Using the raw materials of and, a cylinder-net braided paper was made to prepare a two-layer separator of Example 2.
- the thickness of the completed separator of Example 2 was 70 ⁇ m, the density was 0.300 g/cm 3 , the tensile strength was 14.3 N/15 mm, the drop disappearance time was 200 seconds on one side surface, 150 seconds on the opposite side surface, and the droplet was The disappearance time ratio was 1.3, the airtightness was 350 seconds/100 ml, and the average pore size was 0.5 ⁇ m.
- Example 3 A CSF value of 250 ml obtained by mixing 50% by mass of fibrillated aramid fibers and 50% by mass of fibrillated natural cellulose fibers with a CSF value of 40 ml, and 50% by mass of fibrillated aramid fibers and 50% by mass of fibrillated natural cellulose fibers. Using the above raw materials and, the cylinder net paper was made to prepare a two-layer separator of Example 3.
- the thickness of the completed separator of Example 3 was 40 ⁇ m, the density was 0.250 g/cm 3 , the tensile strength was 7.0 N/15 mm, the droplet disappearance time was 250 seconds on one side surface, 200 seconds on the other side surface, and the droplet was The disappearance time ratio was 1.3, the airtightness was 200 seconds/100 ml, and the average pore size was 3.0 ⁇ m.
- Example 4 Raw material in which 30% by mass of polyvinyl alcohol as a binder material is mixed with a raw material having a CSF value of 40 ml in which 35% by mass of fibrillated aramid fiber and 35% by mass of fibrillated natural cellulose fiber are mixed, and 50% by mass of fibrillated aramid fiber and fibrillated A two-layer separator of Example 4 was produced by using a raw material having a CSF value of 250 ml mixed with 50% by mass of natural cellulose fiber to form a cylinder net.
- the thickness of the completed separator of Example 4 was 35 ⁇ m, the density was 0.600 g/cm 3 , the tensile strength was 12.5 N/15 mm, the droplet disappearance time was 350 seconds on one side surface, 200 seconds on the opposite side surface, and droplets were The disappearance time ratio was 1.8, the airtightness was 50 seconds/100 ml, and the average pore size was 15.0 ⁇ m.
- Example 5 Raw material having a CSF value of 60 ml obtained by mixing 40% by mass of fibrillated aramid fiber and 60% by mass of fibrillated natural cellulose fiber, and 200 ml of CSF value obtained by mixing 60% by mass of fibrillated aramid fiber and 40% by mass of fibrillated natural cellulose fiber. Using the raw materials of and, a cylinder-net web was made to prepare a two-layer separator of Example 5.
- the thickness of the completed separator of Example 5 is 60 ⁇ m, the density is 0.200 g/cm 3 , the tensile strength is 11.7 N/15 mm, the droplet disappearance time is 150 seconds on one side surface, 150 seconds on the opposite side surface, and the droplet is The disappearance time ratio was 1.0, the airtightness was 10 seconds/100 ml, and the average pore size was 13.0 ⁇ m.
- Example 6 A CSF value of 250 ml obtained by mixing 30% by mass of fibrillated aramid fiber and 70% by mass of fibrillated natural cellulose fiber as a raw material having a CSF value of 80 ml, and 70% by mass of fibrillated aramid fiber and 30% by mass of fibrillated natural cellulose fiber. The raw materials of and were used to make a cylinder net paper to prepare a two-layer separator of Example 6.
- the thickness of the completed separator of Example 6 is 30 ⁇ m, the density is 0.400 g/cm 3 , the tensile strength is 13.1 N/15 mm, the droplet disappearance time is 120 seconds on one side surface, 80 seconds on the opposite side surface, and the droplets are The disappearance time ratio was 1.5, the airtightness was 250 seconds/100 ml, and the average pore size was 1.0 ⁇ m.
- Example 7 A CSF value of 150 ml obtained by mixing 20% by mass of fibrillated aramid fiber and 80% by mass of fibrillated natural cellulose fiber with a CSF value of 100 ml, and 80% by mass of fibrillated aramid fiber and 20% by mass of fibrillated natural cellulose fiber. The raw materials of and were used to make cylinder net paper to prepare a two-layer separator of Example 7.
- the thickness of the completed separator of Example 7 is 50 ⁇ m, the density is 0.350 g/cm 3 , the tensile strength is 10.5 N/15 mm, the droplet disappearance time is 100 seconds on one side surface, 50 seconds on the opposite side surface, and the droplet is The disappearance time ratio was 2.0, the airtightness was 150 seconds/100 ml, and the average pore size was 10.0 ⁇ m.
- the thickness of the completed separator of Reference Example 1 was 30 ⁇ m, the density was 0.300 g/cm 3 , the tensile strength was 12.0 N/15 mm, the droplet disappearance time was 280 seconds on one side surface, 250 seconds on the opposite side, and droplets The disappearance time ratio was 1.1, the airtightness was 400 seconds/100 ml, and the average pore size was 0.5 ⁇ m.
- the thickness of the completed separator of Reference Example 2 was 50 ⁇ m, the density was 0.350 g/cm 3 , the tensile strength was 16.0 N/15 mm, the droplet disappearance time was 330 seconds on one surface, 300 seconds on the opposite surface, and droplets were The disappearance time ratio was 1.1, the airtightness was 340 seconds/100 ml, and the average pore diameter was 0.08 ⁇ m.
- Reference Example 3 A raw material having a CSF value of 200 ml obtained by mixing 20% by mass of fibrillated aramid fiber and 80% by mass of fibrillated natural cellulose fiber, and a CSF value of 500 ml obtained by mixing 20% by mass of fibrillated aramid fiber and 80% by mass of fibrillated natural cellulose fiber.
- the thickness of the completed separator of Reference Example 3 was 35 ⁇ m, the density was 0.500 g/cm 3 , the tensile strength was 9.9 N/15 mm, and the droplet disappearance time was 50 seconds on one side surface, 40 seconds on the opposite side surface, and droplets.
- the disappearance time ratio was 1.3, the airtightness was 15 seconds/100 ml, and the average pore size was 18.0 ⁇ m.
- Reference Example 4 A raw material having a CSF value of 200 ml obtained by mixing 80% by mass of fibrillated aramid fiber and 20% by mass of fibrillated natural cellulose fiber, and a CSF value of 500 ml obtained by mixing 80% by mass of fibrillated aramid fiber and 20% by mass of fibrillated natural cellulose fiber. The raw materials of and were used to make a cylinder net paper to produce a two-layer separator of Reference Example 4.
- the thickness of the completed separator of Reference Example 4 was 40 ⁇ m, the density was 0.400 g/cm 3 , the tensile strength was 8.5 N/15 mm, the droplet disappearance time was one side surface 120 seconds, the other side surface 100 seconds, and the droplets The disappearance time ratio was 1.2, the airtightness was 5 seconds/100 ml, and the average pore size was 14.0 ⁇ m.
- Comparative Example 1 A raw material having a CSF value of 300 ml obtained by mixing 10% by mass of fibrillated aramid fiber and 90% by mass of fibrillated natural cellulose fiber, and a CSF value of 600 ml obtained by mixing 10% by mass of fibrillated aramid fiber and 90% by mass of fibrillated natural cellulose fiber. Using the raw materials of No. 1 and No. 2 to make a cylinder net, a two-layer separator of Comparative Example 1 was produced.
- the thickness of the completed separator of Comparative Example 1 was 50 ⁇ m, the density was 0.300 g/cm 3 , the tensile strength was 10.5 N/15 mm, the droplet disappearance time was 10 seconds on one surface, 7 seconds on the opposite surface, and droplets were The disappearance time ratio was 1.4, the airtightness was 12 seconds/100 ml, and the average pore size was 17.0 ⁇ m.
- Comparative Example 2 Raw material obtained by mixing 40 mass% of fibrillated aramid fiber and 30 mass% of fibrillated natural cellulose fiber with 40 mass% of polyvinyl alcohol as a binder material in a raw material having a CSF value of 0 ml, and 50 mass% of fibrillated aramid fiber and fibrillation. A raw material having a CSF value of 50 ml mixed with 50% by mass of natural cellulose fiber was used to make a cylinder net paper to prepare a two-layer separator of Comparative Example 2.
- the thickness of the completed separator of Comparative Example 2 was 40 ⁇ m, the density was 0.350 g/cm 3 , the tensile strength was 16.8 N/15 mm, the droplet disappearance time was 400 seconds on one side surface, 220 seconds on the opposite side surface, and droplets were The disappearance time ratio was 1.8, the airtightness was 110 seconds/100 ml, and the average pore size was 0.09 ⁇ m.
- Comparative Example 3 A CSF value of 500 ml obtained by mixing 90% by mass of fibrillated aramid fiber and 10% by mass of fibrillated natural cellulose fiber as a raw material having a CSF value of 50 ml, and mixing 90% by mass of fibrillated aramid fiber and 10% by mass of fibrillated natural cellulose fiber. The raw materials of and were used to make a cylinder net paper to prepare a two-layer separator of Comparative Example 3.
- the thickness of the completed separator of Comparative Example 3 was 30 ⁇ m, the density was 0.400 g/cm 3 , the tensile strength was 5.8 N/15 mm, the droplet disappearance time was 240 seconds on one side surface, 80 seconds on the opposite side surface, and droplets were The disappearance time ratio was 3.0, the airtightness was 9 seconds/100 ml, and the average pore size was 11.0 ⁇ m.
- a separator manufactured by a method similar to the method described in Example 3 of Patent Document 1 was produced and used as a separator of Conventional Example 1.
- the separator of Conventional Example 1 is a fourdrinier two-layer separator composed of a raw material of fibrillated natural cellulose fiber 100% by mass (CSF value 0 ml) and a raw material of fibrillated natural cellulose fiber 100% by mass (CSF value 700 ml).
- the thickness is 50 ⁇ m
- the density is 0.639 g/cm 3
- the tensile strength is 55.0 N/15 mm
- the drop disappearance time is 1100 seconds on one side surface, 60 seconds on the opposite side
- the drop disappearance time ratio is It was 18.3.
- the airtightness and the average pore diameter could not be measured because the separator was very dense.
- a separator manufactured by a method similar to the method described in Example 7 of Patent Document 2 was produced and used as a separator of Conventional Example 2.
- the separator of Conventional Example 2 is 100% by mass of lyocell fiber which is regenerated cellulose fiber, and 100% by mass of lyocell fiber which is regenerated cellulose fiber (CSF value 200 ml*value after CSF value once decreased to 0 ml).
- CSF value 100 ml is a long-net cylinder double-layer separator composed of a raw material and a thickness of 40 ⁇ m, a density of 0.400 g/cm 3 , a tensile strength of 12.7 N/15 mm, and a droplet disappearance time.
- the surface on one side was 160 seconds, the surface on the other side was 60 seconds, the ratio of droplet disappearance time was 2.7, the airtightness was 200 seconds/100 ml, and the average pore diameter was 0.5 ⁇ m.
- a separator manufactured by a method similar to the method described in Example 1 of Patent Document 3 was produced and used as a separator of Conventional Example 3.
- the separator of Conventional Example 3 is a single-layered net separator made of a raw material having a CSF value of 600 ml, which is a mixture of acrylic short fibers 99.5% by mass and fibrillated cellulose fibers 0.5% by mass, and has a thickness of 40 ⁇ m and a density of 40 ⁇ m.
- a separator manufactured by a method similar to the method described in Example 1 of Patent Document 4 was produced and used as a separator of Conventional Example 4.
- the separator of Conventional Example 4 is a single-layer separator made of a PET fiber 100% by mass by a wet method, and has a thickness of 40 ⁇ m, a density of 0.630 g/cm 3 , a tensile strength of 17.6 N/15 mm, and a liquid.
- Droplet disappearance time was 8 seconds on one surface, 7 seconds on the opposite side, the ratio of droplet disappearance times was 1.1, airtightness was 1.0 second/100 ml, and average pore diameter was 17.0 ⁇ m.
- a separator manufactured by a method similar to the method described in Example 1 of Patent Document 5 was produced and used as a separator of Conventional Example 5.
- the separator of Conventional Example 5 has a PET fiber layer A spun by the melt-blown method, a PET fiber layer B spun by the spunbond method, and a PET fiber 100 spun by a PET fiber layer A spun by the melt-blown method.
- % Dry type three-layer separator having a thickness of 39 ⁇ m, a density of 0.510 g/cm 3 , a tensile strength of 24.0 N/15 mm, a droplet disappearance time of 9 seconds on one side, and 8 on the other side.
- the ratio of droplet disappearance time was 1.1
- the airtightness was 2.0 seconds/100 ml
- the average pore diameter was 6.7 ⁇ m.
- Table 1 shows the raw materials and blends of the separators of Examples 1 to 7, Reference Examples 1 to 4, Comparative Examples 1 to 3 and Conventional Examples 1 to 5.
- Table 2 shows the evaluation results of each separator alone.
- Aluminum electrolytic capacitors produced by using the separators of the above-mentioned respective examples, respective reference examples, respective comparative examples, and respective conventional examples are solid electrolytic capacitors having a rated voltage of 6.3 V for low voltage and rated voltage for high voltage. 50V solid electrolytic capacitor. Further, as a hybrid electrolytic capacitor manufactured by using the separators of the above-mentioned respective examples, respective reference examples, respective comparative examples, and respective conventional examples, a capacitor having a rated voltage of 16V for low voltage and a capacitor having a rated voltage of 80V for high voltage. And were made.
- Example 1 The solid electrolytic capacitor using the separator of Example 1 and having a rated voltage of 6.3 V had an ESR of 9 m ⁇ , a capacitance of 720 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 1 and having a rated voltage of 16 V had an ESR of 10 m ⁇ , a capacitance of 415 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 18 m ⁇ , a capacitance of 40 ⁇ F, and a short circuit failure rate of 0.0%.
- Example 2 The solid electrolytic capacitor using the separator of Example 2 and having a rated voltage of 6.3 V had an ESR of 12 m ⁇ , an electrostatic capacity of 675 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 2 and having a rated voltage of 16 V had an ESR of 13 m ⁇ , an electrostatic capacity of 375 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 23 m ⁇ , a capacitance of 38 ⁇ F, and a short circuit failure rate of 0.0%.
- Example 3 The solid electrolytic capacitor using the separator of Example 3 and having a rated voltage of 6.3 V had an ESR of 14 m ⁇ , a capacitance of 630 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 3 and having a rated voltage of 16 V had an ESR of 16 m ⁇ , a capacitance of 360 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 28 m ⁇ , a capacitance of 35 ⁇ F, and a short circuit failure rate of 0.0%.
- Example 4 The solid electrolytic capacitor using the separator of Example 4 and having a rated voltage of 6.3 V had an ESR of 16 m ⁇ , a capacitance of 585 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 4 and having a rated voltage of 16 V had an ESR of 18 m ⁇ , a capacitance of 325 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 32 m ⁇ , a capacitance of 33 ⁇ F, and a short circuit failure rate of 0.0%.
- Example 5 The solid electrolytic capacitor using the separator of Example 5 and having a rated voltage of 6.3 V had an ESR of 10 m ⁇ , a capacitance of 720 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 5 and having a rated voltage of 16 V had an ESR of 9 m ⁇ , a capacitance of 400 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 19 m ⁇ , a capacitance of 41 ⁇ F, and a short circuit failure rate of 0.0%.
- Example 6 The solid electrolytic capacitor using the separator of Example 6 and having a rated voltage of 6.3 V had an ESR of 14 m ⁇ , a capacitance of 630 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 6 and having a rated voltage of 16 V had an ESR of 16 m ⁇ , a capacitance of 350 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 27 m ⁇ , a capacitance of 36 ⁇ F, and a short circuit failure rate of 0.0%.
- Example 7 The solid electrolytic capacitor using the separator of Example 7 and having a rated voltage of 6.3 V had an ESR of 16 m ⁇ , a capacitance of 585 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Example 7 and having a rated voltage of 16 V had an ESR of 18 m ⁇ , a capacitance of 325 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 32 m ⁇ , a capacitance of 33 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor using the separator of Reference Example 1 and having a rated voltage of 6.3 V had an ESR of 17 m ⁇ , a capacitance of 563 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 25 m ⁇ , a capacitance of 43 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Reference Example 1 and having a rated voltage of 16 V had an ESR of 21 m ⁇ , a capacitance of 313 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 34 m ⁇ , a capacitance of 31 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor using the separator of Reference Example 2 and having a rated voltage of 6.3 V had an ESR of 18 m ⁇ , a capacitance of 540 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 25 m ⁇ , a capacitance of 42 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Reference Example 2 and having a rated voltage of 16 V had an ESR of 21 m ⁇ , a capacitance of 310 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 35 m ⁇ , a capacitance of 30 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor using the separator of Reference Example 3 and having a rated voltage of 6.3 V had an ESR of 13 m ⁇ , a capacitance of 650 ⁇ F, and a short circuit failure rate of 0.1%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 19 m ⁇ , a capacitance of 50 ⁇ F, and a short circuit failure rate of 0.2%.
- the hybrid electrolytic capacitor using the separator of Reference Example 3 and having a rated voltage of 16 V had an ESR of 15 m ⁇ , a capacitance of 360 ⁇ F, and a short circuit failure rate of 0.1%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 25 m ⁇ , an electrostatic capacity of 36 ⁇ F, and a short circuit failure rate of 0.1%.
- the solid electrolytic capacitor using the separator of Reference Example 4 and having a rated voltage of 6.3 V had an ESR of 14 m ⁇ , an electrostatic capacity of 660 ⁇ F, and a short circuit failure rate of 0.2%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 20 m ⁇ , a capacitance of 51 ⁇ F, and a short circuit failure rate of 0.1%.
- the hybrid electrolytic capacitor having a rated voltage of 16 V using the separator of Reference Example 4 had an ESR of 13 m ⁇ , an electrostatic capacity of 355 ⁇ F, and a short circuit failure rate of 0.1%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 26 m ⁇ , a capacitance of 36 ⁇ F, and a short circuit failure rate of 0.1%.
- the solid electrolytic capacitor having a rated voltage of 6.3 V using the separator of Comparative Example 1 had an ESR of 20 m ⁇ , an electrostatic capacity of 500 ⁇ F, and a short circuit failure rate of 0.3%.
- the solid electrolytic capacitor with a rated voltage of 50 V had an ESR of 29 m ⁇ , a capacitance of 39 ⁇ F, and a short circuit failure rate of 0.4%.
- the hybrid electrolytic capacitor using the separator of Comparative Example 1 and having a rated voltage of 16 V had an ESR of 22 m ⁇ , an electrostatic capacity of 290 ⁇ F, and a short circuit failure rate of 0.4%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 38 m ⁇ , a capacitance of 28 ⁇ F, and a short circuit failure rate of 0.3%.
- the solid electrolytic capacitor using the separator of Comparative Example 2 and having a rated voltage of 6.3 V had an ESR of 21 m ⁇ , a capacitance of 505 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 28 m ⁇ , a capacitance of 38 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor using the separator of Comparative Example 2 and having a rated voltage of 16 V had an ESR of 23 m ⁇ , an electrostatic capacity of 292 ⁇ F, and a short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 37 m ⁇ , a capacitance of 28 ⁇ F, and a short circuit failure rate of 0.0%.
- the solid electrolytic capacitor using the separator of Comparative Example 3 and having a rated voltage of 6.3 V had an ESR of 20 m ⁇ , a capacitance of 500 ⁇ F, and a short circuit failure rate of 0.5%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 28 m ⁇ , a capacitance of 38 ⁇ F, and a short circuit failure rate of 0.4%.
- the hybrid electrolytic capacitor using the separator of Comparative Example 3 and having a rated voltage of 16 V had an ESR of 22 m ⁇ , an electrostatic capacity of 290 ⁇ F, and a short circuit failure rate of 0.4%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 38 m ⁇ , a capacitance of 28 ⁇ F, and a short circuit failure rate of 0.5%.
- the solid electrolytic capacitor using the separator of Conventional Example 1 and having a rated voltage of 6.3 V had an ESR of 24 m ⁇ , a capacitance of 450 ⁇ F, and a short circuit failure rate of 0.7%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 33 m ⁇ , a capacitance of 34 ⁇ F, and a short circuit failure rate of 0.8%.
- the hybrid electrolytic capacitor having a rated voltage of 16 V and using the separator of Conventional Example 1 had an ESR of 26 m ⁇ , an electrostatic capacity of 250 ⁇ F, and a short circuit failure rate of 0.8%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 45 m ⁇ , a capacitance of 25 ⁇ F, and a short circuit failure rate of 0.8%.
- the solid electrolytic capacitor using the separator of Conventional Example 2 and having a rated voltage of 6.3 V had an ESR of 23 m ⁇ , an electrostatic capacity of 495 ⁇ F, and a short circuit failure rate of 0.8%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 31 m ⁇ , a capacitance of 35 ⁇ F, and a short circuit failure rate of 0.6%.
- the hybrid electrolytic capacitor using the separator of Conventional Example 2 and having a rated voltage of 16 V had an ESR of 25 m ⁇ , an electrostatic capacity of 275 ⁇ F, and a short circuit failure rate of 0.8%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 41 m ⁇ , a capacitance of 26 ⁇ F, and a short circuit failure rate of 0.7%.
- the solid electrolytic capacitor using the separator of Conventional Example 3 and having a rated voltage of 6.3 V had an ESR of 23 m ⁇ , a capacitance of 480 ⁇ F, and a short circuit failure rate of 0.3%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 30 m ⁇ , a capacitance of 36 ⁇ F, and a short circuit failure rate of 0.3%.
- the hybrid electrolytic capacitor using the separator of Conventional Example 3 and having a rated voltage of 16 V had an ESR of 25 m ⁇ , an electrostatic capacity of 275 ⁇ F, and a short circuit failure rate of 0.4%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 41 m ⁇ , a capacitance of 25 ⁇ F, and a short circuit failure rate of 0.3%.
- the solid electrolytic capacitor using the separator of Conventional Example 4 and having a rated voltage of 6.3 V had an ESR of 22 m ⁇ , a capacitance of 495 ⁇ F, and a short circuit failure rate of 0.4%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 31 m ⁇ , a capacitance of 37 ⁇ F, and a short circuit failure rate of 0.3%.
- the hybrid electrolytic capacitor using the separator of Conventional Example 4 and having a rated voltage of 16 V had an ESR of 25 m ⁇ , a capacitance of 280 ⁇ F, and a short circuit failure rate of 0.3%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 41 m ⁇ , a capacitance of 25 ⁇ F, and a short circuit failure rate of 0.3%.
- the solid electrolytic capacitor using the separator of Conventional Example 5 and having a rated voltage of 6.3 V had an ESR of 22 m ⁇ , a capacitance of 518 ⁇ F, and a short circuit failure rate of 0.3%.
- the solid electrolytic capacitor having a rated voltage of 50 V had an ESR of 30 m ⁇ , a capacitance of 38 ⁇ F, and a short circuit failure rate of 0.4%.
- the hybrid electrolytic capacitor using the separator of Conventional Example 5 and having a rated voltage of 16 V had an ESR of 24 m ⁇ , an electrostatic capacity of 288 ⁇ F, and a short circuit failure rate of 0.3%.
- the hybrid electrolytic capacitor having a rated voltage of 80 V had an ESR of 40 m ⁇ , an electrostatic capacity of 27 ⁇ F, and a short circuit failure rate of 0.4%.
- Table 3 shows the performance evaluation results of the solid electrolytic capacitors.
- Table 4 shows the performance evaluation results of the hybrid electrolytic capacitor.
- the solid electrolytic capacitors having a rated voltage of 6.3 V using the separators of Examples 1 to 7 have a low ESR of 9 to 16 m ⁇ , a high capacitance of 585 to 720 ⁇ F, and a short circuit failure rate. It can be seen that it is as low as 0.0%. Also, it can be seen that the solid electrolytic capacitor using the same separator and having a rated voltage of 50 V has a low ESR of 13 to 23 m ⁇ , a high capacitance of 44 to 55 ⁇ F, and a low short circuit failure rate of 0.0%.
- the hybrid electrolytic capacitor with a rated voltage of 16 V using the same separator also has a low ESR of 9-18 m ⁇ , a high capacitance of 325-415 ⁇ F, and a short circuit failure rate of 0.0%. Furthermore, a hybrid electrolytic capacitor using the same separator and having a rated voltage of 80 V has a low ESR of 18 to 32 m ⁇ , a high capacitance of 33 to 41 ⁇ F, and a low short circuit failure rate of 0.0%.
- the separator of the present embodiment since it is possible to appropriately form the gap between the fibers constituting the separator, while maintaining the shielding property, to enhance the impregnation of the conductive polymer polymerization liquid or dispersion liquid. You can Therefore, as the separator, it is possible to reduce the ESR and improve the capacitance while maintaining the short-circuit resistance.
- the performances of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Reference Example 1 are slightly higher in ESR and slightly lower in electrostatic capacity than the performance of each example. This is because the separator of Reference Example 1 had a high airtightness of 400 seconds/100 ml, and the separator was excessively dense, and thus the impregnation property of the conductive polymer polymerization liquid or dispersion liquid was lowered. Conceivable. From the comparison between Reference Example 1 and Example 2, it is understood that the airtightness of the separator is preferably 350 seconds/100 ml or less.
- the performances of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Reference Example 2 are slightly higher in ESR and slightly lower in electrostatic capacity than the performance of each example. It is considered that this is because the separator of Reference Example 2 had a small average pore size of 0.08 ⁇ m, and the separator was excessively dense, so that the impregnating property of the conductive polymer polymerization liquid or dispersion liquid was reduced.
- the average pore diameter of the separator is preferably 0.1 ⁇ m or more.
- the short circuit defective rate is slightly higher than that of each example. It is considered that this is because the separator of Reference Example 3 had a large average pore diameter of 18.0 ⁇ m, the separator was insufficient in denseness, and burrs of the electrode foil easily penetrated through the separator. From the comparison between Reference Example 3 and Example 4, it can be seen that the average pore diameter of the separator is preferably 15.0 ⁇ m or less.
- the short-circuit defect rate is slightly higher than that of each example. It is considered that this is because the separator of Reference Example 3 has a low airtightness of 5 seconds/100 ml, the separator is not dense enough, and burrs of the electrode foil easily penetrate the separator. From the comparison between Reference Example 4 and Example 5, it is understood that the airtightness of the separator is preferably 10 seconds/100 ml or more.
- the performances of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Comparative Example 1 are higher in ESR and lower in electrostatic capacitance than the performance of each Example. This is because the time required for the liquid droplets to disappear in the separator of Comparative Example 1 was as short as 7 seconds, the gap between the fibers forming the separator was excessively wide, and the capillary phenomenon was difficult to work during the impregnation of the conductive polymer polymerization liquid or dispersion liquid. It is considered that this is because the wettability and spreadability deteriorated, unevenness of impregnation occurred, and the conductive polymer layer serving as an electron conduction path was not uniformly formed. From the comparison between Comparative Example 1 and Example 1, it can be seen that the droplet disappearance time of the separator is preferably 10 seconds or more.
- the solid electrolytic capacitor using the separator of Comparative Example 1 and the hybrid electrolytic capacitor have a higher short-circuit defect rate than the performance of each Example. It is considered that this is because the average pore diameter of the separator of Comparative Example 1 was as large as 17.0 ⁇ m, the denseness of the separator was insufficient, and the burr of the electrode foil easily penetrated the separator.
- the performances of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Comparative Example 2 are higher in ESR and lower in electrostatic capacitance than the performance of each Example.
- the reason for this is that the liquid droplet disappearance time of the separator of Comparative Example 2 is as long as 400 seconds, and the gap between the fibers forming the separator is excessively dense, so that the separator is impregnated with the conductive polymer polymerization liquid or dispersion liquid. It is considered that the reason is that the conductive polymer layer serving as the electron conduction path could not be formed. From the comparison between Comparative Example 2 and Example 4, it can be seen that the droplet disappearance time of the separator is preferably 350 seconds or less.
- the performances of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Comparative Example 3 are higher in ESR and lower in electrostatic capacitance than the performance of each Example. This is because the separator of Comparative Example 3 has a high droplet disappearance time ratio of 3.0, the gaps between the fibers forming the separator surface and the inside of the separator become sparse, and the homogeneity of the entire separator is low, and the conductivity is low. It is considered that this is because the impregnation unevenness of the polymer polymerization liquid or the dispersion liquid occurred, and the conductive polymer layer serving as the electron conduction path was not uniformly formed.
- the ratio of the droplet disappearance time of the separator is preferably 2.0 or less.
- the performance of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Comparative Example 3 is higher in the short circuit defective rate than the performance of each Example. This is because the separator of Comparative Example 3 has a low airtightness of 9 seconds/100 ml and a tensile strength of 5.8 N/15 mm, and due to lack of compactness of the separator and lack of strength of the separator, burrs of the electrode foil, etc. It is considered that the reason is that it became easier to penetrate the separator. From the comparison between Comparative Example 3 and Example 3, it can be seen that the tensile strength of the separator is preferably 7.0 N/15 mm or more.
- each embodiment Comparing the performance of the solid electrolytic capacitor and the hybrid electrolytic capacitor using the separator of Conventional Example 1 with the performance of each embodiment, each embodiment has low ESR and high capacitance. This is because the separator of Conventional Example 1 has a long droplet disappearance time on one surface of the separator of 1100 seconds, and thus the separator of Conventional Example 1 has an excessively dense gap between fibers, and thus the conductive polymer is polymerized. It is considered that the impregnation property of the liquid or the dispersion liquid is poor and the conductive polymer layer serving as the electron conduction path cannot be formed.
- the separator of Conventional Example 1 could not reduce the ESR and improve the capacitance.
- the short defect rate is low in each embodiment. This is because the separator of Conventional Example 1 is composed of only fibrillated natural cellulose fibers, and the cellulose fibers are gradually decomposed under acidic conditions, so that the mechanical strength of the separator is reduced and the electrode foil is reduced. It is considered that the burr and the like easily penetrated the separator, and the short-circuit defect rate increased.
- each embodiment has low ESR and high capacitance. This is because the separator of Conventional Example 2 has a high droplet disappearance time ratio of 2.7, so that the homogeneity of the separator as a whole is low, resulting in uneven impregnation of the conductive polymer polymerization liquid or dispersion liquid. It is conceivable that the conductive polymer layer serving as the conduction path is not uniformly formed. Therefore, the separator of Conventional Example 2 could not reduce the ESR and improve the capacitance.
- the short defect rate is low in each embodiment. This is because the separator of Conventional Example 2 is composed only of regenerated cellulose fibers, so that the regenerated cellulose fibers are gradually decomposed under acidic conditions, so that the mechanical strength of the separator decreases and It is considered that burrs and the like were more likely to penetrate the separator and the short-circuit defect rate was increased.
- each embodiment has low ESR and high capacitance. This is because the separator of Conventional Example 3 has a short drop time of 6 seconds on one surface of the separator and a short drop time of 5 seconds on the opposite surface of the separator, so that the gap between the fibers is excessively wide and the capillary tube during impregnation is large. It is considered that the phenomenon became difficult to work and the wettability and spreadability deteriorated, which resulted in uneven impregnation of the conductive polymer polymerization liquid or dispersion liquid, and the conductive polymer layer serving as the electron conduction path was not uniformly formed. .. Therefore, the separator of Conventional Example 3 could not reduce the ESR and the capacitance.
- the defective rate of short circuit is low in each example.
- the separator of Conventional Example 3 uses synthetic short fibers that are non-fibrillated fibers as fibers constituting the separator, so that the separator has low compactness, and burrs and the like of the electrode foil easily penetrate through the separator. Therefore, it is considered that the short-circuit defect rate increased.
- each embodiment has a low ESR and a high capacitance. This is because the separator of Conventional Example 4 has a short droplet erasing time of 8 seconds on one surface of the separator and 7 seconds of the droplet erasing on the opposite surface of the separator. It is considered that the phenomenon became difficult to work and the wettability and spreadability deteriorated, which resulted in uneven impregnation of the conductive polymer polymerization liquid or dispersion liquid, and the conductive polymer layer serving as the electron conduction path was not uniformly formed. .. Therefore, the separator of Conventional Example 4 could not reduce the ESR and the electrostatic capacity.
- the short circuit defective rate is low in each example. This is because the separator of Conventional Example 4 is composed of only synthetic short fibers that are non-fibrillated fibers, so that the separator has low density, and burrs or the like of the electrode foil easily penetrate through the separator, resulting in a short circuit. It is considered that the defect rate has increased.
- each embodiment has a low ESR and a high capacitance. This is because the separator of Conventional Example 5 has a short drop time of 9 seconds on one surface of the separator and a short drop time of 8 seconds on the opposite surface of the separator. It is considered that the phenomenon became difficult to work and the wettability and spreadability deteriorated, which resulted in uneven impregnation of the conductive polymer polymerization liquid or dispersion liquid, and the conductive polymer layer serving as the electron conduction path was not uniformly formed. .. Therefore, the separator of Conventional Example 5 could not reduce the ESR and improve the capacitance.
- the separator of Conventional Example 5 is a dry non-woven fabric composed of long fibers, and the texture of the separator is poorer than that of the wet non-woven fabric, so that burrs or the like of the electrode foil are more likely to penetrate the separator and the short-circuit failure rate Is thought to have increased.
- the droplet disappearance time on one surface and the opposite surface of the separator is preferably in the range of 10 to 350 seconds, more preferably in the range of 10 to 250 seconds, and further preferably in the range of 10 to 200 seconds. It can be seen that the range is. Further, from the comparison of Examples 5 to 7, it is found that the ratio of the droplet disappearance time is preferably in the range of 1.0 to 2.0, more preferably in the range of 1.0 to 1.5.
- a separator containing a synthetic fiber, the droplet disappearance time on one surface and the opposite surface of the separator is 10 to 350 seconds,
- the ratio to 1.0 to 2.0 the gap between the fibers constituting the separator can be appropriately formed, so that the conductive polymer polymerization liquid can be maintained while maintaining a high shielding property in the separator.
- the impregnating property of the dispersion liquid can be enhanced.
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Abstract
Description
また、パソコン等ではCPUの高速化・高機能化が求められており、動作周波数が一段と高周波化している。
固体電解コンデンサは、電極箔とセパレータとを重ね合わせて巻回して素子巻を形成した後、電極箔のアルミニウム酸化皮膜の欠損部分の修復、および電極箔の切断面やタブ等の未化成部分の化成をおこない、導電性高分子層を形成した後、ケースに挿入、封口して作製している。ハイブリッド電解コンデンサにおいては、導電性高分子層を形成した後に、さらに電解液を含浸し、ケースに挿入、封口して作製している。
あらかじめ重合した導電性高分子を含浸させる場合、導電性高分子を水に分散させた懸濁液(以下、「分散液」と称す。)をコンデンサ素子に含浸後、加熱・乾燥し、導電性高分子層をコンデンサ素子内に形成させる。
これまでにセパレータとして、合成繊維からなるセパレータや天然セルロース繊維からなるセパレータ、合成繊維と天然セルロース繊維とをともに含有したセパレータが用いられており、アルミニウム電解コンデンサや固体電解コンデンサ、電気二重層キャパシタ等の耐ショート性とESRの低減等を目的として、例えば、特許文献1乃至5に記載された技術が開示されている。
仮に、特許文献3のセパレータの緻密性を高くして、耐ショート性の向上を目的にフィブリル化繊維の配合を多くした場合、セパレータの緻密性が高くなることで、導電性高分子の重合液や分散液の含浸性が悪化し、ESR特性および静電容量を向上させることができない。
仮に、特許文献4のセパレータの緻密性を高くして、耐ショート性の向上を目的にフィブリル化繊維を配合した場合、セパレータの緻密性が高くなることで、導電性高分子の重合液や分散液の含浸性が悪化し、ESRの低減および静電容量を向上させることができない。
即ち、一対の電極の間に介在する、アルミニウム電解コンデンサ用セパレータであって、合成繊維を含有し、片側表面および反対側表面の液滴消失時間が10~350秒、液滴消失時間の比が1.0~2.0であることを特徴とする。
更に例えば、前記合成繊維は、フィブリル化ポリアミド繊維を20~80質量%含有し、かつ、フィブリル化天然セルロース繊維を20~80質量%含有することを特徴とする。
そして、陰極材料に導電性高分子を用いたことを特徴とする。
本発明を実施するための形態のアルミニウム電解コンデンサによれば、セパレータとして、例えば、合成繊維を含有し、セパレータの片側表面と反対側表面との液滴消失時間、液滴消失時間の比を一定範囲に制御することで、セパレータを構成する繊維同士の間隙を適切に形成できるため、遮蔽性を維持したまま、導電性高分子の重合液や分散液の含浸性を高めることができる。このため、セパレータとして、耐ショート性を維持したまま、ESRの低減および静電容量を向上させることができる。
また、上記した合成繊維をポリアミド繊維とすることで、セパレータの耐熱性、耐薬品性を高めることができる。
さらにまた、上記したセパレータをフィブリル化繊維のみで構成することによって、セパレータ全体の緻密性を高めることができ、耐ショート性を向上させることができる。
セパレータの片側表面および反対側表面の液滴消失時間は10~350秒の範囲が好ましく、より好ましくは10~250秒の範囲、さらに好ましくは10~200秒の範囲である。
このため、セパレータの片側表面および反対側表面の液滴消失時間が10秒未満、350秒超の何れの場合も、固体電解コンデンサおよびハイブリッド電解コンデンサとしたときにESRの低減および静電容量を向上させることができない。
セパレータの液滴消失時間の比は1.0~2.0の範囲が好ましく、より好ましくは1.0~1.5の範囲である。液滴消失時間の比が2.0超では、セパレータ表面およびセパレータ内部を構成する繊維同士の間隙が疎らになり、セパレータ全体としての均質性が低く、導電性高分子の重合液や分散液の含浸ムラが生じ、電子伝導経路となる導電性高分子層が均一に形成されない。このため、液滴消失時間の比が2.0超の場合、固体電解コンデンサおよびハイブリッド電解コンデンサとしたときにESRの低減および静電容量を向上させることができない。
セパレータの気密度が10秒/100ml未満、平均孔径が15.0μm超では、セパレータの緻密性が不足し、電極箔のバリ等がセパレータを貫通しやすくなるため、ショート不良率を低減できない場合がある。
セパレータの気密度が350秒/100ml超、平均孔径が0.1μm未満では、セパレータが過度に緻密であるため、導電性高分子の重合液や分散液の含浸が困難になり、固体電解コンデンサおよびハイブリッド電解コンデンサとしたときにESRの低減および静電容量を向上させることができない場合がある。
さらに、ポリアミド繊維として、フィブリル化ポリアミド繊維とすることで、セパレータの均質性を高めることができる。ここで、セパレータの片側表面と反対側表面との液滴消失時間、液滴消失時間の比を満足できれば、フィブリル化ポリアミド繊維のバインダー効果は特に限定はない。
セパレータを構成するフィブリル化繊維として、フィブリル化ポリアミド繊維を20~80質量%含有し、かつ、フィブリル化天然セルロース繊維を20~80質量%含有することが好ましい。
フィブリル化ポリアミド繊維の含有量が20質量%未満、すなわち、フィブリル化天然セルロース繊維の含有量が80質量%を超過すると、セパレータの耐酸性、耐酸化性が低下し、導電性高分子の重合液や分散液含浸後のセパレータの機械的強度が低下することで、コンデンサのショート不良率が増加する場合がある。
また、フィブリル化ポリアミド繊維の含有量が80質量%超、すなわち、フィブリル化天然セルロース繊維の含有量が20質量%未満の場合は、水酸基の作用によるセパレータの導電性高分子の重合液や分散液との親和性が低下し、導電性高分子層をコンデンサ素子内部まで均一に形成できず、ESRの低減と静電容量の向上ができない。
セパレータを構成するフィブリル化ポリアミド繊維の中でも、耐熱性の観点から、フィブリル化アラミド繊維が好ましい。
繊維のフィブリル化の手段としては、例えば叩解処理を挙げることができる。繊維の叩解に用いる設備には特に限定はない。一般的にはビーター、コニカルリファイナー、ディスクリファイナー、高圧ホモジナイザーなどが挙げられる。また、本実施の形態で使用する各繊維は、単独で叩解したものを抄紙前に混合してもよく、混合したものを叩解してもよい。
ただし、抄紙法による湿式不織布に限定するものではなく、製膜法で用いられるような、繊維分散液をキャスティングにより製膜する等の方法でも問題はない。
本実施の形態のセパレータおよびアルミニウム電解コンデンサの各特性の具体的な測定は、以下の条件および方法で行った。
CSFは、「JIS P8121-2『パルプ-ろ水度試験法-第2部:カナダ標準ろ水度法』(ISO5267-2『Pulps-Determination of drainability-Part2:“Canadian Standard”freeness method』)」に従
って測定した。
「JIS C 2300-2 『電気用セルロース紙-第2部:試験方法』 5.1 厚さ」に規定された、「5.1.1 測定器および測定方法 a外側マイクロメータを用いる場合」のマイクロメータを用いて、「5.1.3 紙を折り重ねて厚さを測る場合」の10枚に折り重ねる方法で、セパレータの厚さを測定した。
「JIS C 2300-2 『電気用セルロース紙-第2部:試験方法』 7.0A 密度」のB法に規定された方法で、絶乾状態のセパレータの密度を測定した。
〔引張強さ〕
「JIS C 2300-2 『電気用セルロース紙-第2部:試験方法』 8 引張強さ及び伸び」に規定された方法でセパレータの縦方向の引張強さを測定した。
セパレータの液滴消失時間は、セパレータに純水50μlの液滴を測定面から10~50mmの位置から、一粒の水滴を落下させるように滴下する。この滴下された液滴がセパレータに染み込み、完全に消失するまでの時間を測定し、これを液滴消失時間とした。この測定は片側表面および反対側表面でそれぞれ行った。なお、測定中、セパレータと机面が接しないように、セパレータと机面の間に空間ができるように治具に保持して測定する。
「JIS P 8117 『紙および板紙‐透気度および透気抵抗度試験方法(中間領域)‐ガーレー法』」に規定された方法で、B形試験機を用いて100mlの空気が透過するのに適した時間をセパレータの透気抵抗度として測定した。但し、穴の部分の直径が6mmであるアダプタを使用した。
セパレータの平均孔径は、PMI社製Parm-Porometerを用いて、バブルポイント法(ASTMF316-86,JIS K3832)により測定される孔径分布から、その平均孔径(μm)を求めた。なお、平均孔径の測定には試験液としてGALWICK(Porous Materials,Inc社製)を用いた。
各実施例、各従来例のセパレータを用いて定格電圧6.3V、直径8.0mm×高さ7.0mmと、定格電圧50V、直径8.0mm×高さ10.0mmとの二種類の固体電解コンデンサを作製した。
具体的な固体電解コンデンサの作製方法は、以下の通りである。
エッチング処理および酸化皮膜形成処理を行った陽極箔と陰極箔とが接触しないようにセパレータを介在させて巻回し、コンデンサ素子を作製した。作製したコンデンサ素子は、再化成処理後、乾燥させた。
各実施例、各従来例のセパレータを用いて定格電圧16V、直径10.0mm×高さ10.5mmと、定格電圧80V、直径8.0mm×高さ10.0mmとの二種類のハイブリッド電解コンデンサを作製した。
具体的なハイブリッド電解コンデンサの作製方法は、以下の通りである。
エッチング処理および酸化皮膜形成処理を行った陽極箔と陰極箔とが接触しないようにセパレータを介在させて巻回し、コンデンサ素子を作製した。作製したコンデンサ素子は、再化成処理後、乾燥させた。
作製したコンデンサ素子のESRは、温度20℃、周波数100kHzの条件にてLCRメータを用いて測定した。
〔静電容量〕
静電容量は、「JIS C 5101-1 『電子機器用固定コンデンサー第1部:品目別通則』」に規定された、「4.7 静電容量」の方法により求めた。
ショート不良率は、巻回したコンデンサ素子を用いて、エージング中に生じたショート不良数を計数し、ショート不良となった素子数を、エージングを実施したコンデンサ素子数で除して、百分率をもってショート不良率とした。
以下、本発明の実施の形態に係るセパレータの具体的な実施例等について表1乃至表4も参照して説明する。
表1は、実施例1~7、参考例1~4、比較例1~3、従来例1~5の各セパレータの原料と配合とを示し、表2は、各セパレータ単体の評価結果を示す。また、表3は表1及び表2に示すセパレータを用いた固体電解コンデンサの性能評価結果を示し、表4は表1及び表2に示すセパレータを用いたハイブリッド電解コンデンサの性能評価結果を示す。
フィブリル化アラミド繊維80質量%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値0mlの原料と、フィブリル化アラミド繊維80質量%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値400mlの原料と、を用いて円網短網抄紙し、実施例1の二層セパレータを作製した。
完成した実施例1のセパレータの厚さは20μm、密度は0.500g/cm3、引張強さは9.8N/15mm、液滴消失時間は片側表面17秒、反対側表面10秒、液滴消失時間の比は1.7、気密度は280秒/100ml、平均孔径は0.1μmであった。
フィブリル化アラミド繊維20質量%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値20mlの原料と、フィブリル化アラミド繊維20質量%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値300mlの原料と、を用いて円網短網抄紙し、実施例2の二層セパレータを作製した。
完成した実施例2のセパレータの厚さは70μm、密度は0.300g/cm3、引張強さは14.3N/15mm、液滴消失時間は片側表面200秒、反対側表面150秒、液滴消失時間の比は1.3、気密度は350秒/100ml、平均孔径は0.5μmであった。
フィブリル化アラミド繊維50質量%とフィブリル化天然セルロース繊維50質量%とを混合したCSF値40mlの原料と、フィブリル化アラミド繊維50質量%とフィブリル化天然セルロース繊維50質量%とを混合したCSF値250mlの原料と、を用いて円網短網抄紙し、実施例3の二層セパレータを作製した。
完成した実施例3のセパレータの厚さは40μm、密度は0.250g/cm3、引張強さは7.0N/15mm、液滴消失時間は片側表面250秒、反対側表面200秒、液滴消失時間の比は1.3、気密度は200秒/100ml、平均孔径は3.0μmであった。
フィブリル化アラミド繊維35質量%とフィブリル化天然セルロース繊維35質量%とを混合したCSF値40mlの原料にバインダー材料としてポリビニルアルコール30質量%を混合した原料と、フィブリル化アラミド繊維50質量%とフィブリル化天然セルロース繊維50質量%とを混合したCSF値250mlの原料と、を用いて円網短網抄紙し、実施例4の二層セパレータを作製した。
完成した実施例4のセパレータの厚さは35μm、密度は0.600g/cm3、引張強さは12.5N/15mm、液滴消失時間は片側表面350秒、反対側表面200秒、液滴消失時間の比は1.8、気密度は50秒/100ml、平均孔径は15.0μmであった。
フィブリル化アラミド繊維40質量%とフィブリル化天然セルロース繊維60質量%とを混合したCSF値60mlの原料と、フィブリル化アラミド繊維60質量%とフィブリル化天然セルロース繊維40質量%とを混合したCSF値200mlの原料と、を用いて円網短網抄紙し、実施例5の二層セパレータを作製した。
完成した実施例5のセパレータの厚さは60μm、密度は0.200g/cm3、引張強さは11.7N/15mm、液滴消失時間は片側表面150秒、反対側表面150秒、液滴消失時間の比は1.0、気密度は10秒/100ml、平均孔径は13.0μmであった。
フィブリル化アラミド繊維30質量%とフィブリル化天然セルロース繊維70質量%とを混合したCSF値80mlの原料と、フィブリル化アラミド繊維70質量%とフィブリル化天然セルロース繊維30質量%とを混合したCSF値250mlの原料と、を用いて円網短網抄紙し、実施例6の二層セパレータを作製した。
完成した実施例6のセパレータの厚さは30μm、密度は0.400g/cm3、引張強さは13.1N/15mm、液滴消失時間は片側表面120秒、反対側表面80秒、液滴消失時間の比は1.5、気密度は250秒/100ml、平均孔径は1.0μmであった。
フィブリル化アラミド繊維20質量%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値100mlの原料と、フィブリル化アラミド繊維80質量%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値150mlの原料と、を用いて円網短網抄紙し、実施例7の二層セパレータを作製した。
完成した実施例7のセパレータの厚さは50μm、密度は0.350g/cm3、引張強さは10.5N/15mm、液滴消失時間は片側表面100秒、反対側表面50秒、液滴消失時間の比は2.0、気密度は150秒/100ml、平均孔径は10.0μmであった。
フィブリル化アラミド繊維質量80%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値0mlの原料と、フィブリル化アラミド繊維80質量%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値50mlの原料と、を用いて円網短網抄紙し、参考例1の二層セパレータを作製した。
完成した参考例1のセパレータの厚さは30μm、密度は0.300g/cm3、引張強さは12.0N/15mm、液滴消失時間は片側表面280秒、反対側表面250秒、液滴消失時間の比は1.1、気密度は400秒/100ml、平均孔径は0.5μmであった。
フィブリル化アラミド繊維質量20%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値0mlの原料と、フィブリル化アラミド繊維20質量%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値50mlの原料と、を用いて円網短網抄紙し、参考例2の二層セパレータを作製した。
完成した参考例2のセパレータの厚さは50μm、密度は0.350g/cm3、引張強さは16.0N/15mm、液滴消失時間は片側表面330秒、反対側表面300秒、液滴消失時間の比は1.1、気密度は340秒/100ml、平均孔径は0.08μmであった。
フィブリル化アラミド繊維20質量%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値200mlの原料と、フィブリル化アラミド繊維20質量%とフィブリル化天然セルロース繊維80質量%とを混合したCSF値500mlの原料と、を用いて円網短網抄紙し、参考例3の二層セパレータを作製した。
完成した参考例3のセパレータの厚さは35μm、密度は0.500g/cm3、引張強さは9.9N/15mm、液滴消失時間は片側表面50秒、反対側表面40秒、液滴消失時間の比は1.3、気密度は15秒/100ml、平均孔径は18.0μmであった。
フィブリル化アラミド繊維80質量%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値200mlの原料と、フィブリル化アラミド繊維80質量%とフィブリル化天然セルロース繊維20質量%とを混合したCSF値500mlの原料と、を用いて円網短網抄紙し、参考例4の二層セパレータを作製した。
完成した参考例4のセパレータの厚さは40μm、密度は0.400g/cm3、引張強さは8.5N/15mm、液滴消失時間は片側表面120秒、反対側表面100秒、液滴消失時間の比は1.2、気密度は5秒/100ml、平均孔径は14.0μmであった。
フィブリル化アラミド繊維10質量%とフィブリル化天然セルロース繊維90質量%とを混合したCSF値300mlの原料と、フィブリル化アラミド繊維10質量%とフィブリル化天然セルロース繊維90質量%とを混合したCSF値600mlの原料とを用いて円網短網抄紙し、比較例1の二層セパレータを作製した。
完成した比較例1のセパレータの厚さは50μm、密度は0.300g/cm3、引張強さは10.5N/15mm、液滴消失時間は片側表面10秒、反対側表面7秒、液滴消失時間の比は1.4、気密度は12秒/100ml、平均孔径は17.0μmであった。
フィブリル化アラミド繊維30質量%とフィブリル化天然セルロース繊維30質量%とを混合したCSF値0mlの原料にバインダー材料としてポリビニルアルコール40質量%を混合した原料と、フィブリル化アラミド繊維50質量%とフィブリル化天然セルロース繊維50質量%とを混合したCSF値50mlの原料と、を用いて円網短網抄紙し、比較例2の二層セパレータを作製した。
完成した比較例2のセパレータの厚さは40μm、密度は0.350g/cm3、引張強さは16.8N/15mm、液滴消失時間は片側表面400秒、反対側表面220秒、液滴消失時間の比は1.8、気密度は110秒/100ml、平均孔径は0.09μmであった。
フィブリル化アラミド繊維90質量%とフィブリル化天然セルロース繊維10質量%とを混合したCSF値50mlの原料と、フィブリル化アラミド繊維90質量%とフィブリル化天然セルロース繊維10質量%とを混合したCSF値500mlの原料と、を用いて円網短網抄紙し、比較例3の二層セパレータを作製した。
完成した比較例3のセパレータの厚さは30μm、密度は0.400g/cm3、引張強さは5.8N/15mm、液滴消失時間は片側表面240秒、反対側表面80秒、液滴消失時間の比は3.0、気密度は9秒/100ml、平均孔径は11.0μmであった。
特許文献1の実施例3に記載の方法と同様の方法で製造したセパレータを作製し、従来例1のセパレータとした。
従来例1のセパレータは、フィブリル化天然セルロース繊維100質量%(CSF値0ml)の原料と、フィブリル化天然セルロース繊維100質量%(CSF値700ml)の原料と、からなる長網円網二層セパレータであり、厚さは50μm、密度は0.639g/cm3、引張強さは55.0N/15mm、液滴消失時間は片側表面1100秒、反対側表面60秒、液滴消失時間の比は18.3、であった。なお、気密度、平均孔径は、セパレータの緻密性が非常に高く、測定できなかった。
特許文献2の実施例7に記載の方法と同様の方法で製造したセパレータを作製し、従来例2のセパレータとした。
従来例2のセパレータは、再生セルロース繊維であるリヨセル繊維100質量%(CSF値200ml*CSF値が一旦0mlまで低下した後、上昇した値)の原料と、再生セルロース繊維であるリヨセル繊維100質量%(CSF値100ml)の原料と、からなる長網円網二層セパレータであり、厚さは40μm、密度は0.400g/cm3、引張強さは12.7N/15mm、液滴消失時間は片側表面160秒、反対側表面60秒、液滴消失時間の比は2.7、気密度は200秒/100ml、平均孔径は0.5μmであった。
特許文献3の実施例1に記載の方法と同様の方法で製造したセパレータを作製し、従来例3のセパレータとした。
従来例3のセパレータは、アクリル短繊維99.5質量%とフィブリル化セルロース繊維0.5質量%とを混合したCSF値600mlの原料からなる円網一層セパレータであり、厚さは40μm、密度は0.300g/cm3、引張強さは8.5N/15mm、液滴消失時間は片側表面6秒、反対側表面5秒、液滴消失時間の比は1.2、気密度は2秒/100ml、平均孔径は16.0μmであった。
特許文献4の実施例1に記載の方法と同様の方法で製造したセパレータを作製し、従来例4のセパレータとした。
従来例4のセパレータは、PET繊維100質量%の原料からなる湿式法による単層セパレータであり、厚さは40μm、密度は0.630g/cm3、引張強さは17.6N/15mm、液滴消失時間は片側表面8秒、反対側表面7秒、液滴消失時間の比は1.1、気密度は1.0秒/100ml、平均孔径は17.0μmであった。
特許文献5の実施例1に記載の方法と同様の方法で製造したセパレータを作製し、従来例5のセパレータとした。
従来例5のセパレータは、メルトブロウン法により紡糸したPET繊維層Aにスパンボンド法により紡糸したPET繊維層Bを積層し、更に、メルトブロウン法により紡糸したPET繊維層Aを積層したPET繊維100%からなる乾式法による三層セパレータであり、厚さは39μm、密度は0.510g/cm3、引張強さは24.0N/15mm、液滴消失時間は片側表面9秒、反対側表面8秒、液滴消失時間の比は1.1、気密度は2.0秒/100ml、平均孔径は6.7μmであった。
〔実施例1〕
実施例1のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR9mΩ、静電容量720μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR13mΩ、静電容量55μF、ショート不良率0.0%であった。
実施例1のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR10mΩ、静電容量415μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR18mΩ、静電容量40μF、ショート不良率0.0%であった。
実施例2のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR12mΩ、静電容量675μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR17mΩ、静電容量51μF、ショート不良率0.0%であった。
実施例2のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR13mΩ、静電容量375μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR23mΩ、静電容量38μF、ショート不良率0.0%であった。
実施例3のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR14mΩ、静電容量630μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR20mΩ、静電容量48μF、ショート不良率0.0%であった。
実施例3のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR16mΩ、静電容量360μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR28mΩ、静電容量35μF、ショート不良率0.0%であった。
実施例4のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR16mΩ、静電容量585μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR23mΩ、静電容量44μF、ショート不良率0.0%であった。
実施例4のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR18mΩ、静電容量325μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR32mΩ、静電容量33μF、ショート不良率0.0%であった。
実施例5のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR10mΩ、静電容量720μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR13mΩ、静電容量54μF、ショート不良率0.0%であった。
実施例5のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR9mΩ、静電容量400μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR19mΩ、静電容量41μF、ショート不良率0.0%であった。
実施例6のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR14mΩ、静電容量630μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR20mΩ、静電容量49μF、ショート不良率0.0%であった。
実施例6のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR16mΩ、静電容量350μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR27mΩ、静電容量36μF、ショート不良率0.0%であった。
実施例7のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR16mΩ、静電容量585μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR23mΩ、静電容量44μF、ショート不良率0.0%であった。
実施例7のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR18mΩ、静電容量325μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR32mΩ、静電容量33μF、ショート不良率0.0%であった。
参考例1のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR17mΩ、静電容量563μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR25mΩ、静電容量43μF、ショート不良率0.0%であった。
参考例1のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR21mΩ、静電容量313μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR34mΩ、静電容量31μF、ショート不良率0.0%であった。
参考例2のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR18mΩ、静電容量540μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR25mΩ、静電容量42μF、ショート不良率0.0%であった。
参考例2のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR21mΩ、静電容量310μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR35mΩ、静電容量30μF、ショート不良率0.0%であった。
参考例3のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR13mΩ、静電容量650μF、ショート不良率0.1%であった。定格電圧50Vの固体電解コンデンサは、ESR19mΩ、静電容量50μF、ショート不良率0.2%であった。
参考例3のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR15mΩ、静電容量360μF、ショート不良率0.1%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR25mΩ、静電容量36μF、ショート不良率0.1%であった。
参考例4のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR14mΩ、静電容量660μF、ショート不良率0.2%であった。定格電圧50Vの固体電解コンデンサは、ESR20mΩ、静電容量51μF、ショート不良率0.1%であった。
参考例4のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR13mΩ、静電容量355μF、ショート不良率0.1%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR26mΩ、静電容量36μF、ショート不良率0.1%であった。
比較例1のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR20mΩ、静電容量500μF、ショート不良率0.3%であった。定格電圧50Vの固体電解コンデンサは、ESR29mΩ、静電容量39μF、ショート不良率0.4%であった。
比較例1のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR22mΩ、静電容量290μF、ショート不良率0.4%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR38mΩ、静電容量28μF、ショート不良率0.3%であった。
比較例2のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR21mΩ、静電容量505μF、ショート不良率0.0%であった。定格電圧50Vの固体電解コンデンサは、ESR28mΩ、静電容量38μF、ショート不良率0.0%であった。
比較例2のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR23mΩ、静電容量292μF、ショート不良率0.0%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR37mΩ、静電容量28μF、ショート不良率0.0%であった。
比較例3のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR20mΩ、静電容量500μF、ショート不良率0.5%であった。定格電圧50Vの固体電解コンデンサは、ESR28mΩ、静電容量38μF、ショート不良率0.4%であった。
比較例3のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR22mΩ、静電容量290μF、ショート不良率0.4%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR38mΩ、静電容量28μF、ショート不良率0.5%であった。
従来例1のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR24mΩ、静電容量450μF、ショート不良率0.7%であった。定格電圧50Vの固体電解コンデンサは、ESR33mΩ、静電容量34μF、ショート不良率0.8%であった。
従来例1のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR26mΩ、静電容量250μF、ショート不良率0.8%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR45mΩ、静電容量25μF、ショート不良率0.8%であった。
従来例2のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR23mΩ、静電容量495μF、ショート不良率0.8%であった。定格電圧50Vの固体電解コンデンサは、ESR31mΩ、静電容量35μF、ショート不良率0.6%であった。
従来例2のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR25mΩ、静電容量275μF、ショート不良率0.8%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR41mΩ、静電容量26μF、ショート不良率0.7%であった。
従来例3のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR23mΩ、静電容量480μF、ショート不良率0.3%であった。定格電圧50Vの固体電解コンデンサは、ESR30mΩ、静電容量36μF、ショート不良率0.3%であった。
従来例3のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR25mΩ、静電容量275μF、ショート不良率0.4%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR41mΩ、静電容量25μF、ショート不良率0.3%であった。
従来例4のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR22mΩ、静電容量495μF、ショート不良率0.4%であった。定格電圧50Vの固体電解コンデンサは、ESR31mΩ、静電容量37μF、ショート不良率0.3%であった。
従来例4のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR25mΩ、静電容量280μF、ショート不良率0.3%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR41mΩ、静電容量25μF、ショート不良率0.3%であった。
従来例5のセパレータを用いた定格電圧6.3Vの固体電解コンデンサは、ESR22mΩ、静電容量518μF、ショート不良率0.3%であった。定格電圧50Vの固体電解コンデンサは、ESR30mΩ、静電容量38μF、ショート不良率0.4%であった。
従来例5のセパレータを用いた定格電圧16Vのハイブリッド電解コンデンサは、ESR24mΩ、静電容量288μF、ショート不良率0.3%であった。定格電圧80Vのハイブリッド電解コンデンサは、ESR40mΩ、静電容量27μF、ショート不良率0.4%であった。
さらに、比較例3のセパレータを用いた固体電解コンデンサおよびハイブリッド電解コンデンサの性能は、各実施例の性能と比較して、ショート不良率が高くなっている。これは、比較例3のセパレータの気密度が9秒/100ml、引張強さが5.8N/15mmと低く、セパレータの緻密性が不足したことやセパレータの強度不足によって、電極箔のバリ等がセパレータを貫通しやすくなったことが原因であると考えられる。比較例3と実施例3との比較から、セパレータの引張強さは7.0N/15mm以上が好ましいとわかる。
また、実施例5~7の比較から、液滴消失時間の比は1.0~2.0の範囲が好ましく、より好ましくは1.0~1.5の範囲であることがわかる。
Claims (8)
- 一対の電極の間に介在する、アルミニウム電解コンデンサ用セパレータであって、
合成繊維を含有し、片側表面および反対側表面の液滴消失時間が10~350秒、液滴消失時間の比が1.0~2.0であることを特徴とするアルミニウム電解コンデンサ用セパレータ。 - 気密度が10~350秒/100ml、平均孔径が0.1~15.0μmであることを特徴とする請求項1記載のアルミニウム電解コンデンサ用セパレータ。
- 前記合成繊維は、ポリアミド繊維であることを特徴とする請求項1記載のアルミニウム電解コンデンサ用セパレータ。
- 前記ポリアミド繊維は、フィブリル化ポリアミド繊維であることを特徴とする請求項3記載のアルミニウム電解コンデンサ用セパレータ。
- 前記合成繊維は、フィブリル化繊維のみからなることを特徴とする請求項1乃至請求項4記載のアルミニウム電解コンデンサ用セパレータ。
- 前記合成繊維は、フィブリル化ポリアミド繊維を20~80質量%含有し、かつ、フィブリル化天然セルロース繊維を20~80質量%含有することを特徴とする請求項1乃至請求項5記載のアルミニウム電解コンデンサ用セパレータ。
- 請求項1乃至請求項6のいずれかに記載のセパレータを用いたことを特徴とするアルミニウム電解コンデンサ。
- 陰極材料に導電性高分子を用いたことを特徴とする請求項7記載のアルミニウム電解コンデンサ。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/417,653 US20220059291A1 (en) | 2018-12-26 | 2019-12-17 | Separator for aluminum electrolytic capacitor and aluminum electrolytic capacitor |
| KR1020217019442A KR20210102279A (ko) | 2018-12-26 | 2019-12-17 | 알루미늄 전해 콘덴서용 세퍼레이터 및 알루미늄 전해 콘덴서 |
| BR112021012568-0A BR112021012568A2 (pt) | 2018-12-26 | 2019-12-17 | Separador para capacitor eletrolítico de alumínio, e, capacitor eletrolítico de alumínio |
| CN201980085632.3A CN113228212B (zh) | 2018-12-26 | 2019-12-17 | 铝电解电容器用分隔件及铝电解电容器 |
| EP19905766.2A EP3905290A4 (en) | 2018-12-26 | 2019-12-17 | SEPARATOR FOR ALUMINUM ELECTROLYTE CAPACITOR AND ALUMINUM ELECTROLYTE CAPACITOR |
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| JP2018-243651 | 2018-12-26 | ||
| JP2018243651A JP2020107682A (ja) | 2018-12-26 | 2018-12-26 | アルミニウム電解コンデンサ用セパレータおよびアルミニウム電解コンデンサ |
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| US (1) | US20220059291A1 (ja) |
| EP (1) | EP3905290A4 (ja) |
| JP (1) | JP2020107682A (ja) |
| KR (1) | KR20210102279A (ja) |
| CN (1) | CN113228212B (ja) |
| BR (1) | BR112021012568A2 (ja) |
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| KR20220120540A (ko) * | 2019-12-25 | 2022-08-30 | 주식회사 쿠라레 | 전기 화학 소자용 세퍼레이터 |
| WO2025070417A1 (ja) * | 2023-09-29 | 2025-04-03 | 日本ケミコン株式会社 | 固体電解コンデンサ及び製造方法 |
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2018
- 2018-12-26 JP JP2018243651A patent/JP2020107682A/ja active Pending
-
2019
- 2019-12-17 EP EP19905766.2A patent/EP3905290A4/en not_active Withdrawn
- 2019-12-17 US US17/417,653 patent/US20220059291A1/en not_active Abandoned
- 2019-12-17 BR BR112021012568-0A patent/BR112021012568A2/pt not_active IP Right Cessation
- 2019-12-17 CN CN201980085632.3A patent/CN113228212B/zh active Active
- 2019-12-17 TW TW108146129A patent/TW202032595A/zh unknown
- 2019-12-17 KR KR1020217019442A patent/KR20210102279A/ko not_active Ceased
- 2019-12-17 WO PCT/JP2019/049318 patent/WO2020137674A1/ja not_active Ceased
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Also Published As
| Publication number | Publication date |
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| CN113228212B (zh) | 2022-12-23 |
| TW202032595A (zh) | 2020-09-01 |
| CN113228212A (zh) | 2021-08-06 |
| JP2020107682A (ja) | 2020-07-09 |
| KR20210102279A (ko) | 2021-08-19 |
| US20220059291A1 (en) | 2022-02-24 |
| EP3905290A1 (en) | 2021-11-03 |
| BR112021012568A2 (pt) | 2021-09-14 |
| EP3905290A4 (en) | 2022-09-21 |
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