Patent ID: 7214249
Filing Date: 2007-05-08
Classification: H01G,H01M,Y02E

Abstract:
1. A method for conducting electric activation of an electric double layer capacitor comprising: providing an electric double layer capacitor in which nonporous carbonaceous electrodes containing graphite-like fine crystalline carbon are soaked in an organic electrolytic solution; charging the electric double layer capacitor at a constant current until the interelectrode voltage reaches a predetermined voltage which is not lower than the electrostatic capacitance developing voltage but lower than the rated voltage; conducting constant voltage charging for a predetermined time during which ions of solutes in the organic electrolytic solution are conceived to be adsorbed uniformly on the surface of the fine crystalline carbon at that predetermined voltage; conducting constant current charging until the interelectrode voltage reaches a predetermined voltage which is not lower than the rated voltage but is not higher than the decomposition voltage of the electrolytic solution; and conducting constant voltage charging for a predetermined time during which ions of solutes in the organic electrolytic solution are conceived to be inserted uniformly to between layers of the fine crystalline carbon at that predetermined voltage.