ACTIVATED CARBON FOR ELECTRIC DOUBLE-LAYER CAPACITOR ELECTRODE AND METHOD FOR PRODUCING THE ACTIVATED CARBON

摘要

PROBLEM TO BE SOLVED: To provide activated carbon for electric double-layer capacitor electrodes, which has high and excellent electrostatic capacity per unit volume and a long service life and to provide a method for producing the activated carbon for electric double-layer capacitor electrodes. SOLUTION: The activated carbon for electric double-layer capacitor electrodes satisfies the following conditions (a) to (c). The condition (a) is that the nitrogen content is≤1 wt.%. The condition (b) is that the pore volume of pores having≤7Åsize is≤15 cc/g when measured by a DFT method using carbon dioxide adsorption and the ratio of the pore volume of pores having≤7Åsize to the total pore volume is≥40%. The condition (c) is that the amount of surface functional groups is≤0.5 meq/g. The method for producing the activated carbon for electric double-layer capacitor electrodes comprises the steps of: heat-treating pitch or easy-to-graphitize coke at 600-800°C to obtain a carbonized material; nitriding the carbonized material to obtain a nitrided material; and activating the nitrided material. COPYRIGHT: (C)2008,JPO&INPIT