高比能量混合型超级电容器的研制

Trial producing the hybrid pseudo-capacitor with high specific energy

采用涂覆工艺制备LiMn2O4正极片和具有纳米孔径的颗粒活性炭负极片,并组装高比能量的混合型超级电容器。直流放电、温度特性和直流循环性能等表明:该电容器的比能量达到9.6 Wh/kg,漏电电流仅为0.68 mA;在低温-25℃下放置24 h,电容衰减1.5%,漏电电流为0.27 mA;在高温60℃下放置24 h,电容衰减2.0%,漏电电流提高到1.50 mA。以2 A的电流在2.30～1.15 V循环50 000次,电容下降10.96%。

A method to make the hybrid pseudo-capacitor by coating method was issued,in which LiMn2O4 was positive electrode and activated carbon （AC） with nanometer pore size was negative electrode. The tests of direct current （DC） discharging, temperature characteristics and DC cycle performance showed that the specific energy was 9.6 Wh/kg, leakage current was less than0.68 mA.The capacitance decreased 1.5% and leakage current was 0.27 mA after placing 24 h at low temperature of - 25℃.The capacitance decreased 2% and leakage current was 1.5 mA after placing 24 h at high temperature of 60 ℃ .After 50 000 cycles in 2.30- 1.15 V with the current of 2 A,the capacitance decreased 10.96%.