新型复合电化学电容器的研究

在单体碳/碳型双电层电容器的电极中分别添加一定量具有高容量性质的活性物质,构成正、负复合电极,活性物质经激活后即可在两极存储电能。该新型复合电容器与原碳/碳型双电层电容器相比,具有更高的稳定工作电压以及较高的单电极比容量,可有效改善双电层电容器的比能量及安全性能。根据所加活性物质比例及所选工作电压之不同,比能量可增加45%～70%。经不同电流密度恒流充放电试验,复合电容器的功率密度、充放电效率及循环寿命等性能良好,高容量活性物质的添加对双电层电容器较高的自放电现象具有一定的抑制作用。

Study on a new hybrid electrochemical capacitor

Electric double-layer capacitor (EDLC) which use aqueous electrolyte usually has low energy density because it has low working voltage.The energy density and the safety of the capacitor are the most important factors that determine the feasibility of EDLC's use in a particular high power application. Some active materials were added in EDLC's two carbon electrodes in order to get a higher cell voltage. Thus 45%-70% energy density raise of the hybrid capacitor can be obtained, and the using of the capacitor will be more safe. In addition, the hybrid capacitor has the advantages like as high power density, high charge-discharge efficiency, long cycle life and slow self-discharge.