High capacitic activated coke derived from anisotropic coke with using electric filed activation

摘要

Electric double layer capacitor has been extensively studied since it is equipped to electric hybrid cars. Larger capacitance and power density are strongly needed from anisotropic coke with KOH. In addition, some activated carbon has been reported to show higher capacitance when charged at higher voltage. In the present study coal tar derived needle coke, mesophase pitch AR derived carbon and Fluid Coke derived from heavy crude oil were activated KOH and K_2CO_3 after the calcinations at 500～1100°C to compare the surface areas and capacitance obtained. In addition, high voltage charge was examined to clarity by the roles of carbon structure with capacitance increase.