| 摘要 |
PROBLEM TO BE SOLVED: To reduce deterioration of a negative pole by mixing non-graphite baked material and graphite based material to form the negative pole. SOLUTION: An electric double layer capacitor is provided with the following; a positive pole composed of a polarizable electrode whose main body is active carbon, a negative pole whose main body is carbon material capable of occluding and desorbing lithium ions, and organic electrolyte using lithium salt as salute. In the carbon material, lithium ions are desorbed in the mixture of graphite based material and non-graphite based material wherein the spacing of a [002] face is 0.34-0.41 nm, by a chemical method or an electrochemical method. As the non-graphite based material, carbon of easy graphitization, carbon of difficult graphitization, etc., are used. As the graphite based material, natural graphite, artificial graphite, etc., are used. The weight ratio of graphite based material of the negative pole to the non-graphite based material is 0.1-1. The ratio C<+> /C<-> of the electric double layer capacitor is 0,001-0.9. The specific surface area of active carbon used in the positive pole is 800-3000 m<2> /g. |
