熔盐处理MnO_2及其超级电容性能研究  

Molten Salt Treatment of MnO_2 and Investigation on Supercapacitor Properties

作　　者：陈野[1] 张尊波[1] 张巍[1] 刘良[1] 刘智敏[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《电化学》2008年第1期46-50,共5页Journal of Electrochemistry

基　　金：教育部博士点基金(20050217019)资助

摘　　要：以KCl-NaCl-LiCl熔盐体系处理由固相法制备的MnO2,经XRD、循环伏安、恒流充放电和交流阻抗测试表明,合成的MnO2样品含α-MnO2与γ-MnO2混合晶相,熔盐处理后其结晶程度增加,而且超级电容性能明显提高,放电比容量(129.07 F.g-1)比处理前的(100.94 F.g-1)提高了27.88%.熔盐处理后的样品循环性能良好,充放电效率接近100%,等效串联电阻(RESR)和电极电阻(RE)分别为0.28Ω和0.54Ω.The MnO2 prepared by solid phase method is treated by KCl-NaCl-LiCl molten salt system. The XRD patterns indicated that the crystal structures of MnO2 sample have had the α-MnO2 and γ-MnO2 phase, the crystallinity of sample is increased after treated by molten salt. The electrochemical properties were tested by cyclic voltammetry, constant current charge/discharge and AC impedance. The result shows that the supercapacitor performance of the treated material has improved. The specific discharge capacitance of the treated sample are 129.07 F·g^-1, increased by 27.88% compared to 100.94 F·g^-1 of untreated sample. Long cycle life and high coulombic efficiency were also demonstrated after charge/discharge 100 cycles. The value of RESR and RE are 0.28 Ω and 0.54 Ω respectively after treated.

关 键 词：超级电容器 熔盐 MNO2 循环伏安 恒流充放电 交流阻抗 

分 类 号：TM53[电气工程—电器]