Research on New Type NiO_x/KOH/C Supercapacitor

Porous nickel oxides were prepared by hydrolysis and further heat treatment of nickel acetate in air at 300℃. An new type electrochemical capacitor system with an asymmetric con- figuration was demonstrated. The nickel oxides prepared and active carbon were applied to the positive and negative electrodes respectively. These oxides can provide a specific capacitance of 240F/g, and maintain high utilization at high rates of discharge (i.e., high power density). The maximum operational voltage of the capacitor can be improved effectively and high power discharge attained.