A first conductive polymer solution in which fine particles of a conductive polymer are dispersed is applied to a dielectric layer of aluminum oxide, and this solution is dried to form a first conductive polymer layer. Next, a coating solution is applied to the first conductive polymer layer, this solution containing at least one selected from an aromatic sulfonic acid having, in one molecule of the acid, a carboxyl group and a hydroxyl group, or two carboxyl groups, and a salt of the aromatic sulfonic acid. The solution is then dried to form a coating layer. Next, a second conductive polymer solution is applied to the coating layer, the solution being a solution in which fine particles of a conductive polymer are dispersed. This solution is then dried to form a second conductive polymer layer. This process gives a solid electrolyte layer of a capacitor element.

Method for manufacturing solid electrolytic capacitor

Provided is a method for producing electrolytic capacitors that comprises: a step where a dielectric film, formed on the surface of an anode foil having multiple pores, is prepared; a step where the anode foil is impregnated with a first dispersion solution which contains conductive polymer particles and a solvent, and a first conductive polymer layer is formed on the surface of the dielectric film; and a step where the anode foil is impregnated with a second dispersion solution which contains conductive polymer particles and a solvent, and which has a pH further from 7 than the first dispersion solution, and a second conductive polymer layer, which covers the first conductive polymer layer, is formed. With the above steps, the present invention enables the suppression of damage to the dielectric film.

Method for producing electrolytic capacitor

A solid electrolytic capacitor having grooves provided in a valve-acting metal substrate that includes a porous surface part and a non-porous body part, the bottoms of the grooves being non-porous. The valve-acting metal substrate is divided into a plurality of unit regions by the grooves, and define cathode layer formation parts in the porous surface parts for each unit region. A dielectric layer covers the surfaces of the cathode layer formation parts of the valve-acting metal substrate and the grooves between the cathode layer formation parts. A solid electrolyte layer and a cathode extraction layer cover the surface of the dielectric layer, thereby providing a sheet in which a plurality of solid electrolytic capacitor elements are prepared integrally with the grooves interposed therebetween. The sheet is cut at the grooves, and a dielectric layer is formed on the cut surfaces located around the cathode layer formation parts.

Solid-state electrolytic capacitor manufacturing method and solid-state electrolytic capacitor

A cellulose solution obtained by dissolving cellulose in an amine oxide solvent is formed in a film form, and the resulting cellulose solution is immersed in water or a poor solvent of the amine oxide solvent, so as to coagulate and regenerate the cellulose. The regenerated cellulose is washed with water to remove the amine oxide solvent, and then dried, thereby obtaining a cellulose film that is thin, uniform, and dense and has few impurities. An aluminum electrolytic capacitor, which has been down-sized and/or capacity enlarged, can be constructed by interleaving the obtained cellulose film as a separator between an anode aluminum foil and a cathode aluminum foil and winding them into a capacitor element, immersing the capacitor element in liquid electrolyte so as to impregnate it with the electrolyte, placing it in a case, and then sealing it closed and aging it.

Separator for electrolytic capacitor, and electrolytic capacitor

At least one monomer selected from thiophenes and their derivatives is oxidatively polymerized with an oxidizing agent in a solvent mainly composed of water in the presence of a polyanion as a dopant. This conductive polymer microparticle dispersion is manufactured by using, as the polyanion, a polystyrene sulfonic acid and/or its salt each having a Hazen color number in the range of 10 to 1000, inclusive, when the hue of a 2% aqueous solution thereof is measured by the APHA method.

Method of manufacturing conductive polymer microparticle dispersion and method of manufacturing electrolytic capacitor containing the conductive polymer microparticle dispersion

A method of manufacturing a solid electrolytic capacitor having an even conductive polymer layer includes the steps of forming a conductive polymer layer on an anode element by bringing a dispersion containing a conductive solid and a first solvent into contact with the anode element having a dielectric film formed thereon, washing the anode element with a second solvent higher in boiling point than the first solvent, in which the conductive solid can be dispersed, after the conductive polymer layer is formed, and drying the anode element washed with the second solvent at a temperature not lower than the boiling point of the first solvent and lower than the boiling point of the second solvent.

Method of manufacturing solid electrolytic capacitor

An electrolytic capacitor according to the present invention includes a wound element formed by winding an anode body consisting of a band-shaped metal foil and a dielectric coat provided on the surface of the metal foil and a cathode body consisting of a band-shaped metal foil in the longitudinal direction. The electrolytic capacitor includes a first conductive polymer layer provided on the surface of the anode body. The first conductive polymer layer is provided to be more thickly present on an end portion of the anode body in the width direction than on a central portion of the anode body in the width direction on the surface of the anode body.

Electrolytic capacitor and method of manufacturing electrolytic capacitor

PROBLEM TO BE SOLVED: To provide an electrolytic capacitor which has excellent electric characteristics.SOLUTION: According to this invention, an anode body formed by a belt like metal foil and a dielectric substance coat provided on a surface of the metal foil is wound around an electrolytic capacitor in the longitudinal direction. The electrolytic capacitor includes a first conductive polymer layer provided on a surface of the anode body, and the first conductive polymer layer is provided so as to be thicker at end parts than at a center part on the surface of the anode body when viewed in the width direction of the anode body.

Yoshiaki Ishimaru

Papers

Method of manufacturing solid electrolytic capacitor

Electrolytic capacitor and method of manufacturing electrolytic capacitor

Electrolytic capacitor and manufacturing method of the same