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WO2025070507A1 - Condensateur électrolytique - Google Patents

Condensateur électrolytique Download PDF

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Publication number
WO2025070507A1
WO2025070507A1 PCT/JP2024/034217 JP2024034217W WO2025070507A1 WO 2025070507 A1 WO2025070507 A1 WO 2025070507A1 JP 2024034217 W JP2024034217 W JP 2024034217W WO 2025070507 A1 WO2025070507 A1 WO 2025070507A1
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solvent
acid
electrolytic capacitor
chemical conversion
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Japanese (ja)
Inventor
健太 茶城
達治 青山
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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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
    • H01G9/035—Liquid electrolytes, e.g. impregnating materials
    • 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
    • H01G9/07—Dielectric layers
    • 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
    • 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

Definitions

  • This disclosure relates to electrolytic capacitors.
  • Hybrid electrolytic capacitors which contain a solid electrolyte and an electrolyte solution, are considered promising as small, large-capacity capacitors with low ESR (equivalent series resistance).
  • the electrolyte solution used is a solution in which a solute or acid component is dissolved in a non-aqueous solvent, or a liquid component such as a non-aqueous solvent.
  • Patent Document 1 discloses an electrolytic capacitor including a capacitor element and an electrolyte, the capacitor element comprises an anode body having a chemical conversion coating and a solid electrolyte in contact with the chemical conversion coating;
  • the electrolyte solution includes a solvent, a polymer component, and a solute, the solvent contains at least one selected from the group consisting of a lactone compound, a glycol compound, and a sulfone compound;
  • the concentration of the polymer component in the electrolyte solution is 15% by mass or less
  • the solute includes at least one of benzenedicarboxylic acid and its derivative as a first acid component, and at least one of amines and amidines as a base component;
  • the concentration of the solute in the electrolyte is 15% by mass or more and 40% by mass or less,
  • the electrolytic capacitor proposed has a ratio of a conversion voltage V applied to the anode body for forming the conversion coating to a rated voltage Vw of the electrolytic capacitor: V/V
  • an electrolytic capacitor including a capacitor element and a liquid component
  • the capacitor element comprises an anode body having a chemical conversion coating and a solid electrolyte in contact with the chemical conversion coating; a ratio (V/Vw) of a chemical conversion voltage (V volts) applied to the anode body for forming the chemical conversion coating to a rated voltage (Vw volts) of the electrolytic capacitor is 1.80 or less;
  • the liquid component includes a solvent having a melting point and a freezing point of 60° C.
  • the solvent includes a first solvent having a hydroxy group
  • the acid component includes a carboxylic acid compound, the number of moles of the hydroxyl group per 100 g of the solvent is greater than 0.10 and equal to or less than 1.00 moles.
  • V/Vw ratio when the V/Vw ratio is equal to or less than a predetermined value and the electrolytic capacitor is exposed to a high-temperature environment (e.g., a temperature of 100°C or higher and 200°C or lower) for a long period of time, fluctuations in ESR can be suppressed.
  • a high-temperature environment e.g., a temperature of 100°C or higher and 200°C or lower
  • FIG. 1 is a schematic cross-sectional view of an electrolytic capacitor according to an embodiment of the present disclosure.
  • 2 is a schematic diagram showing a portion of a capacitor element of the electrolytic capacitor of FIG. 1 in an expanded form.
  • 1 is a graph showing ⁇ cap in Examples, Comparative Examples, and Reference Examples.
  • 1 is a graph showing ⁇ ESR in Examples, Comparative Examples, and Reference Examples.
  • the thickness of the conversion film tends to decrease. This is expected to result in a high capacity in electrolytic capacitors.
  • the conversion film and the solid electrolyte are in contact, so as the thickness of the conversion film decreases, leakage current becomes more likely to occur.
  • the V/Vw ratio is generally set to a relatively large value (e.g., a value greater than 1.80) to form a conversion film of a certain thickness and suppress leakage current.
  • Patent Document 1 teaches that even when the V/Vw ratio is below a specified value, the rate of change in capacitance and ESR when an electrolytic capacitor is used for a long period of time may be kept relatively small.
  • the evaluation of each rate of change in Patent Document 1 is based on the rate of change in capacitance and ESR after 2,500 hours of aging at 90°C while applying the rated voltage, compared to the initial capacitance and ESR.
  • the V/Vw ratio is below a specified value
  • performing a long-term reliability test in a high-temperature environment for example, a temperature of 100°C to 200°C
  • a high-temperature environment for example, a temperature of 100°C to 200°C
  • the first solvent has little effect on repairing the film, and the amount of water generated by esterification of the first solvent with the carboxylic acid compound is small, so the film repair effect of this water is also small. Therefore, when V/Vw ⁇ 1.80, leakage current is likely to be significant. In particular, a large current flows through the solid electrolyte in the early stages, causing the solid electrolyte to become locally insulated and reducing its conductivity, resulting in a decrease in the initial capacitance.
  • the solvent contained in the liquid component has a melting point and a freezing point of 60°C or less.
  • the melting point and the freezing point of the first solvent, which is included in the category of the solvent, are also 60°C or less.
  • the liquid component includes a solvent and an acid component.
  • the liquid component may further include a base component.
  • solvent examples of the solvent contained in the liquid component include an organic solvent.
  • the organic solvent is preferably a non-aqueous solvent. It may be a protic solvent.
  • the solvent may contain one type of organic solvent (e.g., a non-aqueous solvent) or a combination of two or more types.
  • dialkyl ethers of PEG include diethylene glycol dimethyl ether (DEGDM), hexaethylene glycol dimethyl ether (HEGDM), and ethyl methyl ether of PEG240 (PEGDEM240).
  • the solvent may contain one type of the second ether compound, or may contain two or more types in combination.
  • the liquid component may contain water.
  • the water content in the liquid component contained in the electrolytic capacitor may be 0.1% by mass or more and 6.0% by mass or less, 0.2% by mass or more and 4.0% by mass or less, or 0.5% by mass or more and 2.0% by mass or less.
  • the acid component includes a carboxylic acid compound (first acid component).
  • the liquid component may include an acid component (second acid component) other than the carboxylic acid compound.
  • the liquid component contains a carboxylic acid compound, so that the pH of the liquid component can be kept low.
  • carboxylic acid compounds although esterification of carboxylic acid compounds is likely to proceed, in the present disclosure, the number of moles of hydroxyl groups is within a specific range, so that the progress of esterification can be suppressed and a low pH can be maintained, and therefore, the fluctuation of ESR and the decrease in capacitance can be suppressed when the electrolytic capacitor is exposed to a high-temperature environment for a long period of time.
  • the above carboxylic acids include aliphatic carboxylic acids, alicyclic carboxylic acids, aromatic carboxylic acids, etc.
  • the carboxylic acids may be monocarboxylic acids or polycarboxylic acids.
  • the above acid anhydrides include anhydrides of polycarboxylic acids.
  • the aliphatic carboxylic acids and alicyclic carboxylic acids may be saturated or unsaturated.
  • the number of carbon atoms in the aliphatic carboxylic acids may be 1 to 30 or 2 to 30.
  • the alicyclic carboxylic acids may be 4 to 10 or 5 to 8.
  • the number of carbon atoms in the aromatic carboxylic acids may be 7 to 15 or 7 to 12.
  • the aliphatic ring in the alicyclic carboxylic acids may be a crosslinked ring or a condensed ring in which an aromatic ring is condensed to an aliphatic ring.
  • the aromatic ring may be condensed to an aliphatic ring.
  • the aliphatic ring or aromatic ring may be a heterocycle containing a heteroatom (oxygen atom, sulfur atom, etc.) as a constituent atom of the ring.
  • Aliphatic monocarboxylic acids include, for example, saturated monocarboxylic acids (formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, lauric acid, myristic acid, stearic acid, behenic acid, etc.), and unsaturated monocarboxylic acids (acrylic acid, methacrylic acid, oleic acid, etc.).
  • saturated monocarboxylic acids formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, lauric acid, myristic acid, stearic acid, behenic acid, etc.
  • unsaturated monocarboxylic acids acrylic acid, methacrylic acid, oleic acid, etc.
  • the above-mentioned coordination compounds include, for example, coordination compounds having at least one central atom selected from the group consisting of boron, aluminum, and silicon, and an acid having a carbonyloxy bond bound to this central atom.
  • coordination compounds include borodisalicylic acid, borodisalic acid, borodiglycolic acid, and borodigallic acid.
  • the acid component may contain one type of carboxylic acid compound, or two or more types.
  • carboxylic acid compounds at least one selected from the group consisting of aromatic carboxylic acids (phthalic acid, salicylic acid, benzoic acid, nitrobenzoic acid, etc.) and aliphatic carboxylic acids is preferred. From the viewpoint of easily obtaining high heat resistance, aromatic carboxylic acids are preferred. In addition, the above-mentioned coordination compounds (borodisalicylic acid, borodisalic acid, borodiglycolic acid, etc.) are also preferred.
  • the carboxy group and other acid groups (sulfonic acid group, phosphoric acid group, phosphonic acid group, etc.) of the carboxylic acid compound may each be in any of the following forms: free form, salt form, anion form, or form interacting (complexed, etc.) with the conductive polymer.
  • the carboxy group of the carboxylic acid compound and other acid groups each include all of these forms.
  • the acid component may contain an acid (second acid component) other than a carboxylic acid compound.
  • examples of such other acids include acids having a carbonyloxy bond other than carboxylic acid (oxocarbonic acid, Meldrum's acid, etc.) or a coordination compound thereof, phenolic compounds (picric acid, p-nitrophenol, hydroquinone, pyrogallol, catechol, resorcinol, phloroglucin, etc.) or a coordination compound thereof, sulfur-containing acids (sulfuric acid, sulfonic acids (aromatic sulfonic acids such as benzenesulfonic acid and naphthalenesulfonic acid), oxyaromatic sulfonic acids (phenol-2-sulfonic acid, etc.), etc.), compounds having a sulfonylimide bond, boron-containing acids (boric acid, halogenated boric acids (hydrofluoric boric acid, te
  • Compounds with sulfonylimide bonds include saccharin, 1,2-benzenedisulfonimide, cyclohexafluoropropane-1,3-bis(sulfonyl)imide, 4-methyl-N-[(4-methylphenyl)sulfonyl]benzenesulfonamide, dibenzenesulfonimide, trifluoromethanesulfonanilide, N-[(4-methylphenyl)sulfonyl]acetamide, benzenesulfonanilide, and N,N'-diphenylsulfamide.
  • the acid component may contain one or more of the above-mentioned second acid components.
  • the ratio of the carboxylic acid compound in the acid component may be 30% by mass or more, or may be 50% by mass or more. In this case, the variation in ESR and the decrease in capacitance when the electrolytic capacitor is exposed to a high-temperature environment for a long period of time can be further suppressed.
  • the ratio of the carboxylic acid compound in the acid component is 100% by mass or less. From the viewpoint of improving the film repairability of the chemical conversion film, the ratio of the carboxylic acid compound in the acid component may be 80% by mass or less.
  • the ratio of the carboxylic acid compound in the acid component may be 30% by mass or more (or 50% by mass or more) and 100% by mass or less, or 30% by mass or more (or 50% by mass or more) and 80% by mass or less.
  • the concentration of the carboxylic acid compound contained in the liquid component may be 1% by mass or more and 30% by mass or less, or 1% by mass or more and 20% by mass or less.
  • the liquid component may be an electrolyte solution containing a solute.
  • the solute may contain an acid component and a base component, or may contain a salt of the acid component and the base component.
  • the base component examples include ammonia, amines (specifically, primary amines, secondary amines, and tertiary amines), quaternary ammonium compounds, and amidinium compounds.
  • the liquid component may contain one type of base component, or two or more types.
  • the amine may be aliphatic, aromatic, or heterocyclic.
  • the amine include dialkylamines (such as diethylamine), trialkylamines (such as trimethylamine, ethyldimethylamine, triethylamine (TEA), tri-n-butylamine (TBA), dimethyl-n-octylamine (DMOA)), alkylenediamines (such as ethylenediamine), aromatic amines (such as aniline), and heterocyclic amines (pyrrolidine, imidazole compounds (such as imidazole (Imd), 1,2,3,4-tetramethylimidazolinium), pyridine (Pyr), 4-dimethylaminopyridine, diazabicycloundecene (DBU), N-methylmorpholine (MMP), N-butylmorpholine, and N-isobutylmorpholine).
  • Each of the aromatic amines and heterocyclic amines may be monocyclic or polycycl
  • the equivalent ratio of the carboxylic acid compound to the base component may be 0.5 or more and 10 or less, 1.0 or more and 9.0 or less, or 1.3 or more and 8.9 or less. In this case, a high degree of dissociation of the carboxylic acid compound can be ensured and corrosion of the electrode can be suppressed.
  • the equivalent ratio of the carboxylic acid compound to the base component is the ratio of (the total number of carboxy groups per molecule of the carboxylic acid compound)/(the total number of moles of OH- that can be generated per molecule of the base component).
  • the equivalent ratio of the acid component to the base component may be 0.5 or more and 15 or less, or 1.0 or more and 10 or less.
  • the equivalent ratio of the acid component/base component may be selected from the above numerical range described for the equivalent ratio of the carboxylic acid compound/base component.
  • the equivalent ratio of the acid component to the base component is the ratio of (the total number of acid groups per one molecule of the acid component)/(the total number of moles of OH -- that can be generated per one molecule of the base component).
  • the capacitor element of the electrolytic capacitor includes an anode body having a chemical conversion coating and a solid electrolyte in contact with the chemical conversion coating.
  • the solid electrolyte includes a conductive polymer and constitutes at least a part of the cathode body of the capacitor element.
  • the cathode body may further include a cathode extraction layer (e.g., a cathode foil).
  • the anode body may contain a valve metal, an alloy containing a valve metal, a compound containing a valve metal, etc. These materials may be used alone or in combination of two or more.
  • the valve metal include aluminum, tantalum, niobium, and titanium.
  • Anode foil is suitable as the anode body. It is preferable that the anode body has a porous portion with pores at least on the surface layer.
  • Anode bodies other than anode foil include porous sintered bodies or porous molded bodies of particles containing valve metal.
  • Anode foils having a porous portion can be obtained, for example, by roughening the surface of a substrate (such as a foil-shaped or plate-shaped substrate) containing a valve metal.
  • the roughening can be performed by etching (for example, electrolytic etching or chemical etching).
  • the chemical conversion coating is also called a dielectric layer.
  • the dielectric layer is formed, for example, so as to cover at least a portion of the surface of the anode body.
  • the chemical conversion coating contains, for example, an oxide of a valve metal.
  • the chemical conversion coating when tantalum is used as the valve metal, the chemical conversion coating contains Ta 2 O 5 , and when aluminum is used as the valve metal, the chemical conversion coating contains Al 2 O 3.
  • the chemical conversion coating is not limited to these, and may be any material that functions as a dielectric.
  • the chemical conversion coating is usually formed on the surface of the anode body.
  • the chemical conversion coating is formed on the surface of the porous part of the anode body, it is formed along the inner wall surfaces of the holes in the porous part and the depressions (pits) on the surface of the anode body.
  • the conductive polymer constituting the solid electrolyte includes, for example, a conjugated polymer and a dopant.
  • the solid electrolyte covers, for example, at least a part of the chemical conversion film. This embodiment includes the case where the solid electrolyte is in contact with at least a part of the chemical conversion film.
  • the capacitor element includes an anode foil and a cathode foil
  • the solid electrolyte may be interposed between these foils.
  • the solid electrolyte may be impregnated into a separator interposed between the anode foil and the cathode foil.
  • the solid electrolyte may be in contact with at least a part of the cathode foil in addition to at least a part of the chemical conversion film.
  • the solid electrolyte may form a layer.
  • the solid electrolyte may further include an additive in addition to the conductive polymer, as necessary.
  • Conjugated polymers include known conjugated polymers used in electrolytic capacitors, such as ⁇ -conjugated polymers.
  • Conjugated polymers include, for example, polymers having a basic skeleton of polypyrrole, polythiophene, polyaniline, polyfuran, polyacetylene, polyphenylene, polyphenylenevinylene, polyacene, and polythiophenevinylene.
  • the above polymers may contain at least one monomer unit constituting the basic skeleton.
  • the above polymers include homopolymers, copolymers of two or more monomers, and derivatives thereof (such as substitutes having a substituent).
  • polythiophenes include poly(3,4-ethylenedioxythiophene) (PEDOT).
  • the conjugated polymer may be used alone or in combination of two or more types.
  • the weight average molecular weight (Mw) of the conjugated polymer is not particularly limited and is, for example, 1,000 or more and 1,000,000 or less.
  • the dopant may be a relatively low molecular anion or a polymer anion.
  • the anion include sulfate ion, nitrate ion, phosphate ion, borate ion, organic sulfonate ion, and carboxylate ion.
  • Compounds that generate these anions are used as dopants.
  • dopants that generate sulfonate ions include aromatic sulfonic acid compounds (such as paratoluenesulfonic acid and naphthalenesulfonic acid).
  • the aromatic sulfonic acid compound may have at least one group selected from the group consisting of a carboxy group and a hydroxy group.
  • polymeric anions examples include polyvinyl sulfonic acid, polystyrene sulfonic acid (PSS), polyallylsulfonic acid, polyacrylic sulfonic acid, polymethacrylic sulfonic acid, poly(2-acrylamido-2-methylpropanesulfonic acid), polyisoprene sulfonic acid, polyester sulfonic acid (such as aromatic polyester sulfonic acid), phenolsulfonic acid novolac resin, and polyacrylic acid.
  • the polymeric anion may be a polymer of a single monomer, a copolymer of two or more monomers, or a substituted product having a substituent.
  • polyanions derived from polystyrene sulfonic acid are preferred.
  • dopants are merely examples and are not limited to these.
  • One dopant may be used alone, or two or more dopants may be used in combination.
  • the conductive polymer may be formed, for example, by carrying out at least one of chemical polymerization and electrolytic polymerization of a precursor of a conjugated polymer on a chemical film in the presence of a dopant.
  • a solution in which a conductive polymer is dissolved or a dispersion in which a conductive polymer is dispersed may be brought into contact with a chemical film to form a conductive polymer (e.g., a solid electrolyte layer).
  • the conductive polymer used in these solutions or dispersions can be obtained by polymerizing a precursor of a conjugated polymer in the presence of a dopant.
  • precursors of conjugated polymers include raw monomers of conjugated polymers, and oligomers and prepolymers in which multiple molecular chains of raw monomers are linked together. One type of precursor may be used, or two or more types may be used in combination.
  • the Mw of the dopant is not particularly limited and is, for example, 1,000 or more and 1,000,000 or less.
  • the amount of dopant contained in the conductive polymer is, for example, 10 parts by mass or more and 1,000 parts by mass or less, and may be 20 parts by mass or more and 500 parts by mass or less, relative to 100 parts by mass of the conjugated polymer.
  • the cathode extraction layer may include, for example, a first layer covering at least a part of the solid electrolyte.
  • the cathode extraction layer may include a first layer and a second layer covering the first layer.
  • Examples of the first layer include a layer containing conductive particles, a metal foil (cathode foil), and the like.
  • Examples of the conductive particles include at least one selected from conductive carbon and metal powder.
  • the cathode extraction layer may be formed of a layer containing conductive carbon (such as graphite) (also referred to as a carbon layer) as the first layer and a layer containing metal powder or a metal foil as the second layer. When a metal foil is used as the first layer, the cathode extraction layer may be formed of this metal foil.
  • the cathode extraction layer may be formed by a known method depending on the layer configuration.
  • the layer containing metal powder as the second layer can be formed, for example, by laminating a composition containing metal powder onto the surface of the first layer.
  • a second layer can be, for example, a metal paste layer (such as a silver paste layer) formed using a composition containing metal powder such as silver particles and a resin (binder resin).
  • the resin can be a thermosetting resin such as an imide resin or an epoxy resin, or a thermoplastic resin.
  • the type of metal is not particularly limited, but it is preferable to use a valve metal such as aluminum, tantalum, or niobium, or an alloy containing a valve metal. If necessary, the surface of the metal foil may be roughened.
  • the surface of the metal foil may be provided with a chemical conversion coating, or may be provided with a coating of a metal (heterogeneous metal) different from the metal constituting the metal foil, or a nonmetal.
  • heterogeneous metals and nonmetals include metals such as titanium and nonmetals such as carbon (e.g., conductive carbon).
  • the coating of the dissimilar metal or nonmetal may be the first layer, and the metal foil may be the second layer.
  • a separator may be disposed between the cathode body (e.g., cathode foil) and the anode body (e.g., anode foil).
  • the separator is not particularly limited, and may be, for example, a nonwoven fabric containing fibers of cellulose, polyethylene terephthalate, vinylon, or polyamide (e.g., aliphatic polyamide, aromatic polyamide such as aramid).
  • the solid electrolyte may be impregnated into the separator.
  • the conductive polymer may be interposed between the anode body (e.g., anode foil) and the cathode body (e.g., cathode foil) and may be in contact with at least a portion of the conversion coating and at least a portion of the cathode body.
  • a liquid component was prepared by dissolving the salt of phthalic acid and TEA, and phthalic acid in the resulting mixed solvent. The amounts of each component were adjusted so that the salt concentration in the liquid component was 13% by mass, and the total acid component concentration was approximately 10% by mass. The pH of the prepared liquid component was approximately 4.0 ⁇ 0.5.
  • the capacitor element impregnated with the liquid component was placed inside a bottomed case with the lead wires positioned on the open side of the bottomed case.
  • a sealing member (elastic material containing butyl rubber as a rubber component) formed so that the lead wires could pass through was placed above the capacitor element.
  • the bottomed case was then drawn near the open end, and the open end was then curled to adhere to the sealing member. In this way, the capacitor element and liquid component were sealed inside the bottomed case.
  • An electrolytic capacitor as shown in Figure 1 was completed by placing a seat plate on the curled portion. A total of 40 electrolytic capacitors were made for each example.
  • the produced electrolytic capacitors were aged for 90 minutes at 95°C while applying the rated voltage Vw.
  • the moisture content in the liquid components determined using the procedure described above was 0.5% to 2.0% by mass.
  • Table 1 The evaluation results for each electrolytic capacitor are shown in Table 1.
  • A1 to A13 are working examples
  • B1 to B4 are comparative examples
  • R1 to R17 are reference examples.
  • the results of ⁇ cap and ⁇ ESR in Table 1 are shown in Figures 3 and 4, respectively.
  • the solvents in Table 1 are as follows: (First Solvent) (Polyol Compound) PEG300: polyethylene glycol Mw300 PEG400: Polyethylene glycol Mw400 PEG200: Polyethylene glycol Mw200 EOPO1700: Polyoxyethylene-polyoxypropylene copolymer (Mw 1700) EG: Ethylene glycol DEG: Diethylene glycol TEG: Triethylene glycol GLY: Glycerin (first ether compound) DEGMM: diethylene glycol monomethyl ether PEGMM400: monomethyl ether of polyethylene glycol (Mw400) HEGMM: hexaethylene glycol monomethyl ether (second solvent) GBL: ⁇ -butyrolactone SL: sulfolane PEGDM240: dimethyl ether of polyethylene glycol (Mw240)
  • the electrolytic capacitor disclosed herein can be used as a hybrid electrolytic capacitor.
  • the electrolytic capacitor exhibits small fluctuations in ESR when exposed to high-temperature environments for long periods of time, suppresses capacitance loss, and has high reliability. Therefore, it is particularly suitable for applications requiring high reliability or long life.
  • the applications of the electrolytic capacitor are not limited to these.
  • Electrolytic capacitor 101 Case with bottom 102: Sealing member 103: Seat plate 104A, 104B: Lead wire 105A, 105B: Lead tab 10: Capacitor element 11: Anode foil 12: Cathode foil 13: Separator 14: Stop tape

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Abstract

La présente invention concerne un condensateur électrolytique qui comprend un élément de condensateur et un composant liquide. L'élément de condensateur comprend un corps d'anode ayant un revêtement de conversion chimique, et un électrolyte solide en contact avec le revêtement de conversion chimique. Le rapport V/Vw d'une tension de conversion chimique de V volts appliquée au corps d'anode pour former le revêtement de conversion chimique et une tension nominale de Vw volts du condensateur électrolytique est inférieur ou égal à 1,80. Le composant liquide comprend un solvant ayant un point de fusion et un point de congélation de 60°C ou moins et un composant acide. Le solvant comprend un premier solvant ayant un groupe hydroxy. Le composant acide comprend un composé d'acide carboxylique. Le nombre de moles du groupe hydroxy pour 100 g du solvant est supérieur à 0,10 moles mais inférieur ou égal à 1,00 mole.
PCT/JP2024/034217 2023-09-28 2024-09-25 Condensateur électrolytique Pending WO2025070507A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143414A (ja) * 1985-12-18 1987-06-26 日本電信電話株式会社 長寿命アルミニュウム電解コンデンサの製造方法
WO2019065951A1 (fr) * 2017-09-29 2019-04-04 パナソニックＩｐマネジメント株式会社 Condensateur électrolytique
JP2023072839A (ja) * 2021-11-15 2023-05-25 ルビコン株式会社 電解コンデンサ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143414A (ja) * 1985-12-18 1987-06-26 日本電信電話株式会社 長寿命アルミニュウム電解コンデンサの製造方法
WO2019065951A1 (fr) * 2017-09-29 2019-04-04 パナソニックＩｐマネジメント株式会社 Condensateur électrolytique
JP2023072839A (ja) * 2021-11-15 2023-05-25 ルビコン株式会社 電解コンデンサ

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