| 摘要 |
PROBLEM TO BE SOLVED: To suppress the decrease of electrostatic capacity with time and inner electrical resistance very small, by baking active carbon material in an atmosphere wherein alkaline metal hydroxide exists, eliminating the alkaline metal hydroxide and performing thermal treatment. SOLUTION: Active carbon material is baked in an atmosphere wherein alkaline metal hydroxide exists. After the alkaline metal hydroxide is eliminated, heat treatment is performed, and active carbon for an electrode of an electric double layer capacitor is obtained. In this case, the baking is devided into first step baking of low temperature and second step baking of high temperature. The first step baking is performed at 320-380 deg.C, and the second step baking is performed at 450-700 deg.C. The baking is performed in inert gas. As the alkaline metal hydroxide, sodium hydroxide is desiable, and the using ratio of sodium hydroxide is set to be 0.5-10 pts.wt. The thermal treatment temperature is set to be 750-1050 deg.C. |
