# US 10,865,494 B2 · Electrolytic capacitor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,494 B2 - Document ID: US10865494B2 - Status: Granted - Kind: B2 - Application number: 16/725,752 - Filed: 2019-12-23 - Published: 2020-05-07 - Granted: 2020-12-15 - Earliest claimed: 2016-10-31 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Yuichiro Tsubaki; Tatsuji Aoyama; Kazuyo Saito - Web page: https://patentgrep.com/patent/US10865494B2 ## CPC - C25D 11/12: Anodising more than once, e.g. in different baths - C25D 11/08: containing inorganic acids - H01G 9/0036: {Formation of the solid electrolyte layer} - H01G 9/022: Electrolytes; Absorbents - H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ - H01G 9/032: Inorganic semiconducting electrolytes, e.g. MnO2 - H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) - H01G 9/04: Electrodes {or formation of dielectric layers thereon} - H01G 9/055: Etched foil electrodes - H01G 9/07: Dielectric layers - H01G 9/145: Liquid electrolytic capacitors (H01G11/00 takes precedence) - H01G 9/151: {with wound foil electrodes} - C25D 11/06: characterised by the electrolytes used - C25D 11/16: Pretreatment {, e.g. desmutting} - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) ## Abstract An electrolytic capacitor includes an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolyte solution. The solid electrolyte layer includes a π-conjugated conductive polymer. The electrolyte solution contains a solvent and a solute, and the solvent contains a glycol compound and a sulfone compound. A proportion of the glycol compound contained in the solvent is 10% by mass or more. A proportion of the sulfone compound contained in the solvent is 30% by mass or more. A total proportion of the glycol compound and the sulfone compound contained in the solvent is 70% by mass or more. ## Claims ### Claim 1 An electrolytic capacitor comprising: a capacitor element including an anode body having a dielectric layer and a solid electrolyte layer in contact with the dielectric layer of the anode body; a case that houses the capacitor element; an electrolyte solution that is contained in the case; and a sealing member that seals an opening of the case, wherein: the solid electrolyte layer includes a π-conjugated conductive polymer, the electrolyte solution contains a solvent and a solute, the solvent contains a glycol compound other than a polyalkylene glycol having a weight average molecular weight of 300 or more, a sulfone compound, and a lactone compound, a proportion of the glycol compound contained in the solvent is 10% by mass or more, a proportion of the sulfone compound contained in the solvent is greater than 30% by mass, a total proportion of the glycol compound and the sulfone compound contained in the solvent is 70% by mass or more, a proportion of the lactone compound contained in the solvent is more than 0% by mass and less than or equal to 30% by mass, and the sealing member includes a butyl rubber. ### Claim 2 (depends on 1) The electrolytic capacitor according to claim 1, wherein: the solvent further contains the polyalkylene glycol having a weight average molecular weight of 300 or more. ### Claim 3 (depends on 2) The electrolytic capacitor according to claim 2, wherein a proportion of the polyalkylene glycol contained in the solvent ranges from 5% by mass to 30% by mass, inclusive. ### Claim 4 (depends on 1) The electrolytic capacitor according to claim 1, wherein the proportion of the sulfone compound contained in the solvent is more than the proportion of the glycol compound contained in the solvent. ### Claim 5 (depends on 1) The electrolytic capacitor according to claim 1, wherein the proportion of the sulfone compound contained in the solvent is greater than 40% by mass. ### Claim 6 (depends on 1) The electrolytic capacitor according to claim 1, wherein the proportion of the sulfone compound contained in the solvent is 50% by mass or more and 90% by mass or less. ### Claim 7 (depends on 1) The electrolytic capacitor according to claim 1, wherein the sulfone compound includes sulfolane. ### Claim 8 (depends on 1) The electrolytic capacitor according to claim 1, wherein the lactone compound includes γ-butyrolactone. ### Claim 9 (depends on 1) The electrolytic capacitor according to claim 1, wherein the proportion of the glycol compound contained in the solvent ranges from 10% by mass to 70% by mass, inclusive. ### Claim 10 (depends on 1) The electrolytic capacitor according to claim 1, wherein the glycol compound includes at least one selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, and hexaethylene glycol. ### Claim 11 (depends on 1) The electrolytic capacitor according to claim 1, wherein the glycol compound includes ethylene glycol. ### Claim 12 (depends on 1) The electrolytic capacitor according to claim 1, wherein: the solute includes an acid component and a base component, and a proportion of the solute contained in the electrolyte solution ranges from 10% by mass to 40% by mass, inclusive. ### Claim 13 (depends on 12) The electrolytic capacitor according to claim 12, wherein: the acid component includes an organic carboxylic acid compound, and the base component includes at least one selected from the group consisting of an amine compound, a quaternary amidinium compound, and a quaternary ammonium compound. ### Claim 14 (depends on 13) The electrolytic capacitor according to of claim 13, wherein the amine compound includes at least one selected from the group consisting of a primary amine compound, a secondary amine compound, and a tertiary amine compound. ### Claim 15 (depends on 13) The electrolytic capacitor according to of claim 13, wherein the quaternary amidinium compound includes at least one selected from the group consisting of a quaternary imidazolinium compound and a quaternary imidazolium compound. ### Claim 16 (depends on 1) The electrolytic capacitor according to of claim 1, wherein the electrolyte solution further contains a boric acid ester compound. ### Claim 17 (depends on 1) The electrolytic capacitor according to of claim 1, wherein the proportion of the lactone compound contained in the solvent is 10% by mass or more.