真空法制备超级电容器碳电极材料

Preparation of carbon material for supercapacitor by vacuumizing

采用真空技术把硫酸电解质溶液引入大比表面积BP2000碳粉的内孔,增加碳材料内比表面积的利用率。采用循环伏安、恒电流充放电和交流阻抗实验对真空处理前后的BP2000碳粉进行比较。实验结果表明,真空处理的最佳时间为30 min;真空处理后BP2000碳粉的比容量为260.1 F/g,比未经过真空处理BP2000碳粉提高约200%;组装电容器的比电容为84.01 F/g,增加了85.17%;真空处理后电容器循环充放电1 000次比容量衰减34.9%,真空处理前衰减73.1%。这表明真空法制备碳电极材料具有较好的可逆性和电容特性。

By vacuumizing method, BP2000 carbon owning large specific surface area was prepared in supercapacitor. The performance of the capacitor was studied by cyclic voltammograms, constant current charge/discharge methods and impedance test. The best time of vacuumizing was 30 min, the specific capacitance of carbon electrode was 260.1 F/g, more than that of original carbon electrode 200%; the specific capacitance of capacitor was 84.01 F/g that enhanced by 85.17% than that of no-vacuumizing; also the specific capacitance of 1 000 times declined 34.9% under current density of 3 A/g. These results show that the capacitor has the typical character of capacitance.