Electric double layer capacitor
AssigneeAsahi Glass Company, Limited
InventorsManabu Suhara, Kazuya Hiratsuka, Takeshi Morimoto, Katsuji Ikeda
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Abstract
An electric double layer capacitor is provided that includes a positive electrode having a currect collector combined with a polarizable electrode material composed mainly of activated carbon, a negative electrode having a current collector of porous metal incapable of forming an alloy with lithium, combined with a carbonaceous material having lithium ions occluded by a chemical method or an electrochemical method to a carbon material capable of occluding and releasing a lithium ions, and a nonaqueous electrolyte containing a lithium salt. The negative electrode is supported on a current collector of porous metal having a thickness of 0.1 to 1 mm and a porosity of 5 to 80%.
Claims13
An electric double layer capacitor comprising a positive electrode having a current collector combined with a polarizable electrode material composed mainly of activated carbon, a negative electrode having a current collector of porous metal incapable of forming an alloy with lithium, combined with a carbonaceous material having lithium ions occluded by a chemical method or an electrochemical method to a carbon material occluding and releasing lithium ions, and a nonaqueous electrolyte containing a lithium salt, wherein the negative electrode is prepared by having a mixture of a binder and a carbon material occluding and releasing lithium ions, supported on a current collector of porous metal having a porosity of more than 80%, followed by compressing the negative electrode to bring the thickness to a level of from 0.1 to 1 mm and the porosity to a level of from 5 to 80%.
An electric double layer capacitor comprising:
- a positive electrode having a current collector combined with a polarizable electrode material composed mainly of activated carbon,
- a negative electrode having a current collector of a porous metal having a porosity prior to compression of 80-99.5% and a porosity after compression of from 5 to 80% and a thickness after compression of from 0.1 to 1 mm, an average pore number of at least 5 and incapable of forming an alloy with lithium, combined with a carbonaceous material having lithium ions occluded, wherein said carbonaceous material having lithium ions occluded is obtained by a chemical method or an electrochemical method by occluding lithium ions to a carbon material selected from the group consisting of natural graphite;
- artificial graphite;
- graphitized meso-carbon microbeads;
- graphite whiskers;
- graphitized carbon fibers;
- gas phase grown carbon fibers;
- graphitizable materials obtained by heat treatment of a coke selected from the group consisting of coal coke, petroleum coke and pitch coke;
- a baked product of a furfuryl alcohol resin;
- a baked product of a phenol resin and a baked product of a novolak resin, wherein the carbon material occludes and releases lithium ions;
- and
- a nonaqueous electrolyte containing a lithium salt.
Dependencies are inferred from the claim text.