| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric double layer capacitor which has little change of the internal resistance over aging and high reliability even when the capacitor is used for a long period of time. SOLUTION: The electric double layer capacitor is constituted of an element comprising a positive electrode and a negative electrode, each having an electrode layer containing a carbon material of 100-2500 m<SP>2</SP>/g specific surface area formed on a metal current collector. A separator is arranged between the positive electrode and the negative electrode, and a nonaqueous electrolytic solution is infiltrated into the element. In the negative electrode, a porous layer having higher conductivity than that of the electrode layer is formed on the surface of the electrode layer. COPYRIGHT: (C)2004,JPO
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