Development of Electric Double Layer Capacitors with a High Energy Density

Abstract

The rectangular-type electric double layer capacitor was obtained with sheet-type electrodes with a high capacitance density. The energy density and the power density were 11.6 Wh/L and 600 W/L, respectively. The capacitor showed high performance in a low temperature region of −20°C. In charge-discharge experiments, the capacitor also showed very stable cycle-life performance, from which the estimated life of the capacitor was over 30,000 cycles.