低温熔盐法制备MnO_2及其电容性能研究  

Supercapacitor Performance of MnO_2 Prepared in Low Temperature Molten Salt System

作　　者：陈野[1] 张春霞[1] 舒畅[1] 葛鑫[1] 韩丹丹[1] 张密林[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001

出　　处：《硅酸盐通报》2007年第2期260-263,共4页Bulletin of the Chinese Ceramic Society

基　　金：教育部博士点基金(NO20050217019)

摘　　要：采用低温熔盐法在150℃的KCl-AlCl3体系中制备了MnO2,并对其结构和形貌进行表征,XRD结果表明所制样品主相为α-MnO2,SEM结果表明样品为微米级片状结构。以所制备的MnO2作为电极活性物质,在2mol/L的(NH4)2SO4电解液中对其电化学性质进行测试和研究。循环伏安结果表明该材料具有良好的电容性能,用恒流充放电测得在1mA条件下,放电比电容可达290.72F.g-1。经5mA恒电流循环100次后电极性能趋于稳定,充放电效率接近100%,表现出优异的循环性能。MnO2 was prepared in low temperature molten salt system of KCl-AlCl3 at 150℃.Its structure and shape were studied by XRD and SEM.The results show that the sample is slice with size of micron and the crystallization is α-form.The electrochemical properties were tested by cyclic voltammetry and constant current charge/discharge.The specific discharge capacitance is 290.72F·g^-1 with a constant current of 1mA.Long cycle life and high coulombic efficiency were also demonstrated after charge/discharge 100 cycles.

关 键 词：超级电容器 熔盐法 循环伏安 恒流充放 MNO2 

分 类 号：TQ137.12[化学工程—无机化工]