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WO2021193212A1 - Élément condensateur et condensateur électrolytique - Google Patents

Élément condensateur et condensateur électrolytique Download PDF

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Publication number
WO2021193212A1
WO2021193212A1 PCT/JP2021/010467 JP2021010467W WO2021193212A1 WO 2021193212 A1 WO2021193212 A1 WO 2021193212A1 JP 2021010467 W JP2021010467 W JP 2021010467W WO 2021193212 A1 WO2021193212 A1 WO 2021193212A1
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Prior art keywords
solid electrolyte
electrolyte layer
capacitor element
layer
capacitor
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PCT/JP2021/010467
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English (en)
Japanese (ja)
Inventor
拓弥 栗本
斉 福井
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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
    • H01G9/025—Solid electrolytes
    • H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ

Definitions

  • This disclosure relates to capacitor elements and electrolytic capacitors.
  • an electrolytic capacitor having an anode forming a dielectric layer and a solid electrolyte layer covering at least a part of the dielectric layer is promising.
  • the solid electrolyte layer usually contains a conductive polymer and a dopant. By using a dopant, high conductivity is imparted to the conductive polymer.
  • Patent Document 1 proposes to use a naphthalene sulfonic acid derivative and sulfuric acid as dopants.
  • the capacitor element according to the first aspect of the present disclosure includes an anode, a dielectric layer formed on the surface of the anode, a solid electrolyte layer covering at least a part of the dielectric layer, and the solid electrolyte layer.
  • the solid electrolyte layer comprises a conductive polymer and a dopant
  • the dopant comprises a benzene skeleton and at least one sulfo group attached to the benzene skeleton.
  • the sulfate ion contained in the solid electrolyte layer is 1% by mass or less.
  • the electrolytic capacitor according to the second aspect of the present disclosure includes the above-mentioned capacitor element.
  • an electrolytic capacitor having a large capacitance and suppressed performance deterioration under high temperature and high humidity can be obtained.
  • FIG. 1 is a cross-sectional view schematically showing a capacitor element according to an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view schematically showing an electrolytic capacitor according to an embodiment of the present disclosure.
  • the dielectric layer has fine irregularities, and the conductive polymer is arranged along the irregularities. Since the sulfate ion has a small molecular size, it can be doped even in a conductive polymer that has entered the recess. Therefore, an improvement in capacitance can be expected. On the other hand, sulfate ions are easily dedoped under high temperature and high humidity, and exist as sulfate ions or sulfuric acid liberated in the solid electrolyte layer. Sulfate ions and sulfuric acid in the solid electrolyte layer may corrode the dielectric layer.
  • the concentration of sulfate ions contained in the solid electrolyte layer is set to 1% by mass or less. As a result, the generation of sulfuric acid in the solid electrolyte layer is suppressed, and the deterioration of the performance under high temperature and high humidity (hereinafter, may be referred to as moisture resistance characteristics) is suppressed.
  • a dopant having a benzene skeleton is used. Since the dopant having a benzene skeleton has a smaller molecular size than, for example, a dopant having a naphthalene skeleton, it is easy to dope the conductive polymer that has entered the recess of the dielectric layer. Therefore, an improvement in capacitance can be expected. Since the sulfo group bonded to the benzene skeleton is difficult to be desorbed, the dedoping of sulfate ions under high temperature and high humidity is suppressed.
  • the concentration of sulfate ions contained in the solid electrolyte layer is preferably 0.5% by mass or less, more preferably 0.1% by mass or less. However, the solid electrolyte layer may contain a small amount of sulfate ions.
  • the conductivity of the polymerization solution affects the polymerization rate of the raw material monomer. Sulfuric acid increases the conductivity of the polymerization solution, so that the polymerization rate of the raw material monomer can be increased. Therefore, it is desirable to add sulfuric acid to the polymerization solution from the viewpoint of productivity. In this case, the sulfuric acid added to the polymerization solution may be contained in the solid electrolyte layer. From the above viewpoint, sulfate ions may be contained in the solid electrolyte layer at a concentration of 0.01% by mass or more.
  • the sulfate ion concentration in the solid electrolyte layer can be calculated as follows.
  • the electrolytic capacitor is disassembled, the capacitor element is taken out, and a part of the solid electrolyte layer is taken out from this capacitor element by scraping or the like.
  • the obtained solid electrolyte layer (sample) is immersed in ion-exchanged water in a beaker and heated, and the ion-exchanged water is boiled for 10 minutes.
  • a sample is removed from the beaker, ion-exchanged water is analyzed by ion chromatography, and the sulfate ion concentration is measured.
  • the mass of sulfate ions contained in the sample is obtained from the measured sulfate ion concentration, and converted to the sulfate ion concentration in the solid electrolyte layer.
  • Capacitor element It includes an anode, a dielectric layer formed on the surface of the anode, a solid electrolyte layer covering at least a part of the dielectric layer, and a cathode extraction layer covering at least a part of the solid electrolyte layer.
  • a capacitor element is, for example, a sheet or a flat plate.
  • the dopant includes a compound having a benzene skeleton and at least one sulfo group bonded to the benzene skeleton (hereinafter, referred to as a first dopant compound).
  • the above sulfo group in addition to the SO 3 H group, include salts or esters of sulfo group.
  • the salt include a metal salt and an onium salt.
  • the metal salt include alkali metal salts such as sodium salt.
  • the onium salt include ammonium salt, sulfonium salt, phosphonium salt and the like. Sulfo groups, in the solid electrolyte layer, the anion (-SO 3 -), - SO 3 H, present in the form of a salt or ester.
  • the position of each sulfo group is not particularly limited.
  • the two sulfo groups may be in any of the ortho-position, meta-position and para-position positions.
  • the number of sulfo groups is preferably 3 or less. When the number of sulfo groups is 3 or less, the decomposition of the first dopant compound is likely to be suppressed.
  • the number of sulfo groups may be one.
  • the first dopant compound may have a substituent.
  • substituents include a nitro group, a hydroxy group, a hydrocarbon group, a methoxy group and a carboxy group.
  • the first dopant compound preferably has at least one substituent selected from the group consisting of a nitro group, a hydroxy group, a hydrocarbon group, a methoxy group and a carboxy group.
  • the first dopant compound preferably has one or more carboxy groups in that the interaction between the conductive polymer and the first dopant compound is enhanced and dedoping is easily suppressed.
  • the first dopant compound has one carboxy group, it is preferable that the sulfo group and the carboxy group are located at the meta position.
  • the first dopant compound has two carboxy groups, it is preferable that the sulfo group and each carboxy group are respectively located at the meta position.
  • the hydroxy group includes an ester of a hydroxy group in addition to an OH group.
  • Hydroxy groups, in the solid electrolyte layer, the anion (-O -), - are present in the form of OH or an ester.
  • the carboxy group includes a salt or ester of the carboxy group in addition to the COOH group. Examples of the salt include metal salts such as sodium salts (alkali metal salts and the like), ammonium salts, sulfonium salts, phosphonium salts and the like.
  • the hydrocarbon group a chain-like aliphatic hydrocarbon group is desirable because it is easy to dope the conductive polymer that covers the concave portion of the dielectric.
  • the chain aliphatic hydrocarbon group may be, for example, a saturated hydrocarbon group represented by ⁇ (CH 2 ) n H (n is an integer of 1 or more and 20 or less), and is an unsaturated hydrocarbon group. It's okay.
  • the aliphatic hydrocarbon group may have a substituent such as a hydroxyl group or an alkoxy group.
  • the first dopant compound may further have a polymerizable group.
  • the polymerizable group is preferably a radically polymerizable group.
  • Examples of the polymerizable group include a group having an intercarbon double bond and an intercarbon triple bond.
  • the first dopant compound may be present in the solid electrolyte layer in the form of a dimer, trimmer, oligomer, polymer or the like.
  • the first dopant compound examples include benzenesulfonic acid, 3-nitrosulfonic acid, 4-phenolsulfonic acid, 4-anisolesulfonic acid, paratoluenesulfonic acid, 2,4-dimethylbenzenesulfonic acid, 3-.
  • Sulfonic benzoic acid 5-sulfosalicylic acid, 5-sulfophthalic acid, 5-sulfoisophthalic acid, 5-sulfoterephthalic acid, 1,3-benzenedisulfonic acid, 3,5-nitrodisulfonic acid, 2,4-phenoldisulfonic acid, Examples thereof include 2,4-anisole disulfonic acid, 3,5-disulfobenzoic acid, 3,5-toluenedisulfonic acid, 1,3,5-benzenetrisulfonic acid and 2,4,6-trinitrobenzenesulfonic acid. Of these, 3-sulfobenzoic acid is preferable because it has a small molecular weight and has a carboxy group.
  • the number average molecular weight of the first dopant compound is not particularly limited.
  • the number average molecular weight of the first dopant compound is preferably 400 g / mol or less because the radius of gyration is small and it is easy to dope the conductive polymer that covers the recesses of the dielectric.
  • the number average molecular weight of the first dopant compound is more preferably 300 g / mol or less, and particularly preferably 250 g / mol or less.
  • the solid electrolyte layer may contain a dopant other than the first dopant compound (hereinafter, referred to as a second dopant compound).
  • a dopant other than the first dopant compound hereinafter, referred to as a second dopant compound.
  • the ratio of the second dopant compound to the total dopant is preferably 5% by mass or less.
  • the amount of the first dopant compound added is not particularly limited. From the viewpoint of improving conductivity, the ratio of the first dopant compound to the conductive polymer is, for example, 0.1% by mass or more and 50% by mass or less.
  • the second dopant compound may be a monomolecular anion or a polymer anion.
  • the monomolecular anion include naphthalene sulfonic acid and the like.
  • Specific examples of the high molecular weight anion include polyvinyl sulfonic acid, polystyrene sulfonic acid, polyallyl sulfonic acid, polyacrylic sulfonic acid, polymethacrylic sulfonic acid, poly (2-acrylamide-2-methylpropanesulfonic acid), and polyisoprene sulfonic acid. , Polyacrylic acid and the like. These may be used alone or in combination of two or more. Further, these may be polymers of a single monomer or may be a copolymer of two or more kinds of monomers.
  • the anode body includes a foil (metal foil) containing a valve acting metal as a conductive material or a porous sintered body containing a valve acting metal. Anode wires are planted from the porous sintered body. The anode wire is used for connection with the anode lead terminal.
  • the valve acting metal include titanium, tantalum, aluminum and niobium.
  • the anode body may contain one kind or two or more kinds of the above-mentioned valve action metals.
  • the anode body may contain the valve acting metal in the form of an alloy containing the valve acting metal, a compound containing the valve acting metal, or the like.
  • the thickness of the anode body, which is a metal foil, is not particularly limited, and is, for example, 15 ⁇ m or more and 300 ⁇ m or less.
  • the thickness of the anode body, which is a porous sintered body, is not particularly limited, and is, for example, 15 ⁇ m or more and 5 mm or less.
  • the dielectric layer is formed by anodizing the valve acting metal on the surface of the anode body by chemical conversion treatment or the like.
  • the dielectric layer may be formed so as to cover at least a part of the anode body.
  • the dielectric layer is usually formed on the surface of the anode. Since the dielectric layer is formed on the porous surface of the anode body, it is formed along the inner wall surface of the holes and pits on the surface of the anode body.
  • the dielectric layer contains an oxide of the valvening metal.
  • the dielectric layer when tantalum is used as the valve acting metal contains Ta 2 O 5
  • the dielectric layer when aluminum is used as the valve acting metal contains Al 2 O 3 .
  • the dielectric layer is not limited to this, and may be any one that functions as a dielectric.
  • the dielectric layer is formed along the surface of the anode, including the inner walls of holes and pits.
  • the solid electrolyte layer may be formed so as to cover at least a part of the dielectric layer, and may be formed so as to cover the entire surface of the dielectric layer.
  • the solid electrolyte layer contains a conductive polymer and a dopant.
  • the sulfate ion contained in the solid electrolyte layer is 1% by mass or less.
  • Examples of the conductive polymer include polypyrrole, polythiophene, polyfuran, polyaniline, polyacetylene, polyphenylene, polyphenylene vinylene, polyacene, polythiophene vinylene and the like. These may be used alone, in combination of two or more, or in a copolymer of two or more monomers.
  • polypyrrole, polythiophene, polyfuran, polyaniline, etc. mean macromolecules having polypyrrole, polythiophene, polyfuran, polyaniline, etc. as the basic skeleton, respectively. Therefore, polypyrrole, polythiophene, polyfuran, polyaniline and the like may also contain their respective derivatives.
  • polythiophene includes poly (3,4-ethylenedioxythiophene) and the like.
  • the solid electrolyte layer may be a single layer or may be composed of a plurality of layers.
  • the composition of the conductive polymer contained in each layer may be the same or different.
  • the cathode extraction layer may be formed so as to cover at least a part of the solid electrolyte layer, and may be formed so as to cover the entire surface of the solid electrolyte layer.
  • the cathode extraction layer has, for example, a carbon layer and a metal (for example, silver) paste layer formed on the surface of the carbon layer.
  • the carbon layer is composed of a carbon paste containing a conductive carbon material such as graphite.
  • the metal paste layer is composed of, for example, a composition containing silver particles and a resin.
  • the structure of the cathode extraction layer is not limited to this, and may be any structure having a current collecting function.
  • FIG. 1 is a cross-sectional view schematically showing a capacitor element according to the present embodiment.
  • the capacitor element 10 includes an anode body 11, a dielectric layer 12 covering at least a part of the anode body 11, a solid electrolyte layer 13 covering at least a part of the dielectric layer 12, and a cathode extraction layer 14.
  • the cathode extraction layer 14 includes a carbon layer 141 and a metal paste layer 142.
  • Such a capacitor element 10 has, for example, a sheet shape or a flat plate shape.
  • the electrolytic capacitor according to this embodiment includes the above-mentioned capacitor element.
  • the electrolytic capacitor may include a plurality of capacitor elements.
  • a plurality of capacitor elements are laminated.
  • the number of laminated capacitor elements is not particularly limited, and is, for example, 2 or more and 20 or less.
  • At least one of the plurality of capacitor elements may be the capacitor element according to the present embodiment.
  • Others may be conventionally known capacitor elements.
  • all of the plurality of capacitor elements arranged in the electrolytic capacitor are the capacitor elements according to the present embodiment.
  • the anode parts of the laminated capacitor elements are joined by welding and electrically connected.
  • the plurality of anode portions may be welded after being crimped by, for example, bent anode lead terminals.
  • An anode lead terminal is joined to the anode portion of at least one capacitor element.
  • the cathode layers of the laminated capacitor elements are also electrically connected.
  • a cathode lead terminal is bonded to the cathode layer of at least one capacitor element.
  • Cathode lead terminals are joined via a conductive adhesive or solder, or by resistance welding or laser welding.
  • the conductive adhesive is, for example, a mixture of a curable resin and carbon particles or metal particles.
  • the material of the lead terminal is not particularly limited as long as it is electrochemically and chemically stable and has conductivity, and may be metal or non-metal.
  • the shape is also not particularly limited.
  • the thickness of the lead terminal (distance between the main surfaces of the lead terminal) is preferably 25 ⁇ m or more and 200 ⁇ m or less, and more preferably 25 ⁇ m or more and 100 ⁇ m or less from the viewpoint of reducing the height.
  • the capacitor element may be sealed by an exterior body so that at least a part of the anode lead terminal and the cathode lead terminal is exposed.
  • Examples of the material of the exterior body include a cured product of a curable resin and engineering plastic.
  • Examples of the thermosetting resin include epoxy resin, phenol resin, silicone resin, melamine resin, urea resin, alkyd resin, polyurethane, and unsaturated polyester.
  • Engineering plastics include general purpose engineering plastics and super engineering plastics. Examples of engineering plastics include polyimide and polyamide-imide.
  • FIG. 2 is a cross-sectional view schematically showing an electrolytic capacitor according to this embodiment.
  • the electrolytic capacitor 100 includes one or more capacitor elements 10, an anode lead terminal 30 bonded to the anode body of the capacitor element 10, a cathode lead terminal 40 bonded to a metal paste layer, and an exterior body that seals the capacitor element. 20 and.
  • the capacitor element according to this embodiment can be manufactured by the following process.
  • Roughen at least one main surface of the metal leaf By roughening, a porous portion having a large number of fine pores is formed at least on the main surface side of the metal foil.
  • Electrolytic etching is performed, for example, by electrolytic etching a metal foil.
  • Electrolytic etching can be performed by, for example, a DC electrolysis method or an AC electrolysis method.
  • the etching conditions are not particularly limited, and are appropriately set according to the depth of the porous portion, the type of valve acting metal, and the like.
  • a dielectric layer is formed on the surface of an anode body.
  • the method for forming the dielectric layer is not particularly limited.
  • the dielectric layer can be formed, for example, by chemical conversion treatment of the anode body.
  • the chemical conversion treatment for example, the anode is immersed in a chemical conversion solution such as an ammonium adipate solution and heat-treated.
  • the anode body may be immersed in a chemical conversion liquid and a voltage may be applied.
  • Step of forming a solid electrolyte layer A solid electrolyte layer is formed on the surface of the dielectric layer.
  • the solid electrolyte layer can be formed by chemical polymerization and / or electrolytic polymerization using a polymerization solution containing a raw material monomer or oligomer and a dopant containing a first dopant compound in the presence of an anode ().
  • First method The solid electrolyte layer is formed by applying a solution in which a conductive polymer is dissolved or a dispersion liquid in which a conductive polymer is dispersed (hereinafter, may be collectively referred to as a treatment liquid) to the dielectric layer. It may be (second method).
  • Sulfuric acid may remain in the commercially available first dopant compound. Therefore, the sulfuric acid that may be contained in the first dopant compound may be removed before adding the first dopant compound to the polymerization solution.
  • the first dopant compound is added to the ion-exchanged water to disperse it, and then the ion-exchange resin is added to the ion-exchanged water, stirred, and filtered.
  • the first dopant compound may be added to ion-exchanged water to disperse the compound, and then ultrafiltration may be performed.
  • the sulfuric acid in the treatment liquid may be removed by using an ion exchange resin instead of or in addition to the above method.
  • the sulfuric acid in the treatment liquid may be removed by ultrafiltration of the treatment liquid. Then, the treatment liquid is applied to the dielectric layer.
  • the raw material monomer or oligomer is a monomer or oligomer that is a raw material for the conductive polymer.
  • a monomer or oligomer that is a raw material for the conductive polymer.
  • pyrrole for example, pyrrole, aniline, thiophene, derivatives thereof and the like.
  • a cathode drawer layer is formed by sequentially applying, for example, carbon paste and silver paste on the surface of the solid electrolyte layer. As a result, a capacitor element can be obtained.
  • a step of preparing one or more capacitor elements obtained by the above method a step of electrically connecting a lead terminal to the capacitor element, and a part of the capacitor element and the lead terminal being formed by an exterior body. It can be manufactured by a manufacturing method including a covering step.
  • a method of manufacturing an electrolytic capacitor including a plurality of stacked capacitor elements will be shown.
  • a laminated body is produced by laminating precursors of a plurality of capacitor elements and joining the anode parts to each other.
  • the anode parts are joined by welding and / or caulking, etc., and are electrically connected.
  • the welding method is not particularly limited, and laser welding or resistance welding may be used.
  • (C) Lead terminal connection step The anode lead terminal is electrically connected to the anode portion of at least one capacitor element, and the cathode lead terminal is electrically connected to the cathode lead-out layer.
  • the anode portion and the anode lead terminal are, for example, welded and electrically connected.
  • the cathode lead-out layer and the cathode lead terminal are electrically connected, for example, by adhering the cathode lead-out layer and the cathode lead terminal via a conductive adhesive.
  • (D) Sealing step A part of the laminated capacitor elements and lead terminals is sealed with an exterior body. Sealing is performed using molding techniques such as injection molding, insert molding, and compression molding. For example, using a predetermined mold, a material for an exterior body containing a curable resin or a thermoplastic resin is filled so as to cover one end of a laminated capacitor element and a lead terminal, and then heating or the like is performed.
  • Example 1 Twenty electrolytic capacitors A1 having a laminate of seven capacitor elements were produced in the following manner.
  • Capacitor Element An aluminum foil (thickness 100 ⁇ m) was prepared as a base material, and the surface of the aluminum foil was etched to obtain an anode body. By immersing the anode body in the chemical conversion solution and applying a DC voltage of 70 V for 20 minutes, a dielectric layer containing aluminum oxide (Al 2 O 3) was formed on the surface of the anode body. The anode foil on which the dielectric layer was formed was immersed in a liquid composition containing a conductive material to form a precoat layer.
  • the raw material powder of benzenesulfonic acid was put into water and stirred, and then ultrafiltration was performed to remove sulfuric acid from the raw material powder.
  • the filtered benzenesulfonic acid was dispersed in water to prepare a dopant solution (benzenesulfonic acid concentration 30% by mass).
  • a dopant solution benzenesulfonic acid concentration 30% by mass.
  • pyrrole monomer of a conductive polymer
  • the anode foil on which the dielectric layer and the precoat layer were formed was immersed in the obtained polymerization solution, and electrolytic polymerization was carried out at an applied voltage of 3 V to form a solid electrolyte layer.
  • the sulfate ion concentration contained in the solid electrolyte layer was 0.03% by mass.
  • a dispersion liquid in which graphite particles were dispersed in water was applied to the solid electrolyte layer, and then dried to form a carbon layer on the surface of the solid electrolyte layer.
  • a silver paste containing silver particles and a binder resin epoxy resin
  • a cathode extraction layer composed of a carbon layer and a metal paste layer was formed to obtain a capacitor element.
  • the obtained seven capacitor elements were laminated, and the anode parts were joined by laser welding to obtain a laminated body.
  • Example 2 In the production of the capacitor element (1), the capacitor element is the same as in Example 1 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 0.43% by mass. , And 20 electrolytic capacitors A2 were prepared.
  • Example 3 In the production of the capacitor element (1), the capacitor element is the same as in Example 1 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 0.90% by mass. , And 20 electrolytic capacitors A3 were prepared.
  • Comparative Example 1 In the production of the capacitor element (1), the capacitor element is the same as in Example 1 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 1.20% by mass. , And 20 electrolytic capacitors B1 were prepared.
  • Comparative Example 2 In the production of the capacitor element (1), the capacitor element was prepared in the same manner as in Example 1 except that the concentration of sulfate ions contained in the solid electrolyte layer was adjusted to 0.08% by mass by using naphthalene sulfonic acid as a dopant. Twenty electrolytic capacitors B2 were prepared.
  • Comparative Example 3 In the production of the capacitor element (1), the capacitor element is the same as in Comparative Example 2 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 1.13% by mass. , And 20 electrolytic capacitors B3 were prepared.
  • Example 4 In the production of the capacitor element (1), a capacitor was used in the same manner as in Example 1 except that 3-sulfobenzoic acid was used as a dopant and the concentration of sulfate ions contained in the solid electrolyte layer was adjusted to 0.02% by mass. The element was manufactured, and 20 electrolytic capacitors A4 were manufactured. The obtained electrolytic capacitor was evaluated in the same manner as in Example 1. The results are shown in Table 2.
  • Example 5 In the production of the capacitor element (1), the capacitor element is the same as in Example 4 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 0.48% by mass. , And 20 electrolytic capacitors A5 were prepared. The obtained electrolytic capacitor was evaluated in the same manner as in Example 1. The results are shown in Table 2.
  • Example 6 In the production of the capacitor element (1), the capacitor element is the same as in Example 4 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 0.86% by mass. , And 20 electrolytic capacitors A6 were prepared. The obtained electrolytic capacitor was evaluated in the same manner as in Example 1. The results are shown in Table 2.
  • Comparative Example 4 In the production of the capacitor element (1), the capacitor element is the same as in Example 4 except that dilute sulfuric acid is added to the dopant solution to adjust the sulfate ion concentration contained in the solid electrolyte layer to 1.06% by mass. , And 20 electrolytic capacitors B4 were prepared. The obtained electrolytic capacitor was evaluated in the same manner as in Example 1. The results are shown in Table 2.
  • the electrolytic capacitor according to the present disclosure has excellent moisture resistance. Therefore, it can be used in various applications where low ESR is required.
  • Electrolytic capacitor 10 Capacitor element 11: Anode body 12: Dielectric layer 13: Solid electrolyte layer 14: Cathode extraction layer 141: Carbon layer 142: Metal paste layer 20: Exterior body 30: Anode lead terminal 40: Cathode lead terminal

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  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

Dans la présente invention, un élément condensateur comprend un corps d'anode, une couche diélectrique formée sur la surface du corps d'anode, une couche d'électrolyte solide qui recouvre au moins une partie de la couche diélectrique, et une couche de sortie de cathode qui recouvre au moins une partie de la couche d'électrolyte solide ; la couche d'électrolyte solide contenant un polymère électroconducteur et un dopant ; le dopant contenant un composé qui présente un squelette de benzène et au moins un groupe sulfo lié au squelette de benzène ; et des ions sulfate contenus dans la couche d'électrolyte solide étant présents en une quantité de 1 % en masse ou moins. L'invention concerne également un condensateur électrolytique dans lequel toute baisse de performance à haute température et à humidité élevée est réduite au minimum grâce à l'utilisation de l'élément condensateur et du condensateur électrolytique.
PCT/JP2021/010467 2020-03-25 2021-03-15 Élément condensateur et condensateur électrolytique Ceased WO2021193212A1 (fr)

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JP2020054302A JP2023058759A (ja) 2020-03-25 2020-03-25 コンデンサ素子および電解コンデンサ

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Citations (6)

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JP2003068577A (ja) * 2001-08-24 2003-03-07 Nippon Chemicon Corp 固体電解コンデンサ及びその製造方法
JP2008098401A (ja) * 2006-10-12 2008-04-24 Sanyo Electric Co Ltd 固体電解コンデンサの製造方法
WO2009001707A1 (fr) * 2007-06-26 2008-12-31 Tayca Corporation Substance capable de servir d'agent oxydant et de dopant pour la synthèse d'un polymère électriquement conducteur, solution alcoolique de celle-ci, polymère électriquement conducteur et condensateur à électrolyte solide
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