碳纳米管在室温熔盐中的电容特性

研究了碳纳米管在室温熔盐二(三氟甲基磺酸酰)亚胺锂(LiTFSI)-乙酰胺中的电容特性. 将碳纳米管制成薄膜电极, 以LiTFSI-乙酰胺为电解液, 装配成模拟电容器, 用循环伏安和恒流充放电法研究其电化学性能. 结果表明, 碳纳米管在室温熔盐中表现出典型的电容特性, 其比电容为22 F•g^-1, 模拟电容器的工作电压可达2.0 V, 具有非常好的循环性能, 循环充放电1000次后容量损失仅10%, 表明室温熔盐是超级电容器非常有前景的新型电解液.

Capacitance Characteristics of Carbon Nanotubes in Room Temperature Molten Salt Electrolyte

Capacitance characteristics of carbon nanotubes (CNTs) in room temperature molten salt (RTMS) electrolyte of LiTFSI-acetamide were investigated. Cyclic voltammetry (CV) and galvanostatic charge/discharge measurements were employed to investigate the electrochemical performance of the test cells composed of a pair of carbon nanotubes electrodes and RTMS as electrolyte. The CNTs exhibited typical capacitance behavior in LiTFSI-acetamide, and a high specific capacitance of 22 F•g-1 estimated from galvanostatic discharge was obtained. The working voltage of the test cells could reach at 2.0 V, and they also showed a practical good level of durability over cycles of charge and discharge. After 1000 charge and discharge cycles, the capacity loss was just 10% of the initial discharge capacity. The preliminary results suggest that RTMS is a kind of promising electrolyte for supercapacitors.