# US 5,706,165 A · Electric double-layer capacitor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,165 A - Document ID: US5706165A - Status: Granted - Kind: A - Application number: 08/344,712 - Filed: 1994-11-18 - Granted: 1998-01-06 - Earliest claimed: 1993-12-06 - Assignees: Nisshinbo Industries, Inc. - Inventors: Kazuo Saito; Atsushi Hagiwara; Toshiharu Okamoto - Web page: https://patentgrep.com/patent/US5706165A ## CPC - H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives - H01G 11/34: characterised by carbonisation or activation of carbon - H01G 11/38: Carbon pastes or blends; Binders or additives therein - H01G 11/72: specially adapted for integration in multiple or stacked hybrid or EDL capacitors - H01G 11/32: Carbon-based - Y02E 60/13: Energy storage using capacitors - 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) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract An electric double-layer capacitor including, as the positive electrode and the negative electrode, a material obtained by adhering a polarizable electrode on one or both sides of a conductive material by the use of a conductive adhesive, in which capacitor the polarizable electrodes are formed by a carbon material composed mainly of active carbon, amorphous carbon and expanded graphite, or the conductive adhesive is composed mainly of a resin and expanded graphite, or the polarizable electrodes are formed by a carbon material composed mainly of active carbon, amorphous carbon and expanded graphite and the conductive adhesive is composed mainly of a resin and expanded graphite. The electric double-layer capacitor has alleviated the drawbacks of the prior art, has a low internal resistance, gives substantially no change in internal resistance when subjected to repeated discharging, and has a long life. ## Claims ### Claim 1 An electric double-layer capacitor comprising, as the positive electrode and the negative electrode, a material obtained by adhering a polarizable electrode on one or both sides of a conductive material by the use of a conductive adhesive, in which capacitor the polarizable electrodes are formed by a carbon material composed mainly of active carbon, amorphous carbon and expanded graphite. ### Claim 2 An electric double-layer capacitor comprising, as the positive electrode and the negative electrode, a material obtained by adhering a polarizable electrode on one or both sides of a conductive material by the use of a conductive adhesive, in which capacitor the polarizable electrodes are formed by a carbon material composed mainly of active carbon, amorphous carbon and expanded graphite and the conductive adhesive is composed mainly of a resin and expanded graphite. ### Claim 3 (depends on 1, 3) An electric double-layer capacitor according to claim 1 or 3, wherein the conductive material is impervious to any liquid. ### Claim 4 (depends on 1, 2) An electric double-layer capacitor according to claim 1 or 2, wherein the active carbon is a powder, particulate or fiber. ### Claim 5 (depends on 1, 2) An electric double-layer capacitor according to claim 1 or 2, wherein the amorphous carbon is obtained by pyrolyzing a thermosetting resin in a non-oxidizing atmosphere. ### Claim 6 (depends on 1, 2) An electric double-layer capacitor according to claim 1 or 2, wherein the carbon material is obtained by pyrolyzing, in a non-oxidizing atmosphere, a mixture consisting mainly of active carbon, expanded graphite and a thermosetting resin, capable of becoming amorphous carbon when pyrolyzed in a non-oxidizing atmosphere. ### Claim 7 (depends on 6) An electric double-layer capacitor according to claim 6, wherein the proportion of the active carbon and the expanded graphite in the mixture is 100 parts by weight of active carbon to 0.01-1,000 parts by weight of expanded graphite. ### Claim 8 (depends on 6) An electric double-layer capacitor according to claim 6, wherein the proportion of the active carbon and the thermosetting resin capable of becoming amorphous carbon when pyrolyzed in a non-oxidizing atmosphere, in the mixture is 100 parts by weight of active carbon to 0.5-100 parts by weight thermosetting resin. ### Claim 9 (depends on 2) An electric double-layer capacitor according to claim 2, wherein the resin is at least one resin selected from the group consisting of a polycarbodiimide resin, a phenolic resin, a furan resin, an epoxy resin, a urethane resin, an ABS resin, a polyphenylene sulfate resin, an acrylic resin, a polyethylene, a polypropylene, a polyacetylene, an ethylene-vinyl acetate copolymer, a polystyrene, a pitch, a polyethylene terephthalate, a polybutylene terephthalate, an isobutyl-isoprene copolymer rubber, a butadiene rubber, a styrene rubber, a silicone rubber, an ethylene-propylene rubber, a nitrile rubber, an acrylic rubber, a urethane rubber, a fluororubber, a polyvinyl butyral, methyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, ethyl hydroxyethyl cellulose and hydroxypropyl cellulose. ### Claim 10 (depends on 2) An electric double-layer capacitor according to claim 2, wherein the conductive adhesive contains a solvent. ### Claim 11 (depends on 10) An electric double-layer capacitor according to claim 10, wherein the solvent is at least one solvent selected from the group consisting of toluene, acetone, water, methanol, ethanol, propanol, tetrachloroethylene, trichloroethylene, bromochloromethane, diacetone, dimethylformamide, ethyl ether, cresol, xylene, chloroform, butanol and dimethyl ether. ### Claim 12 (depends on 1) An electric double-layer capacitor according to claim 1, wherein the proportion of the resin and the expanded graphite in the conductive adhesive is 100 parts by weight (of resin) and 0.01-5,000 parts by weight of expanded graphite. ### Claim 13 (depends on 5) An electric double-layer capacitor according to claim 5, wherein said thermosetting resin is a member selected from the group consisting of polycarbodiimide resin, phenolic resin, furan resin and epoxy resin. ### Claim 14 (depends on 6) An electric double-layer capacitor according to claim 6, wherein said thermosetting resin is a member selected from the group consisting of polycarbodiimide resin, phenolic resin, furan resin and epoxy resin.