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Electric double layer capacitor

  • US 5,953,204 A
  • Filed: 12/18/1995
  • Issued: 09/14/1999
  • Est. Priority Date: 12/27/1994
  • Status: Expired due to Fees
First Claim
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1. 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%.

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