Electrochemical characterization of MnO_2 as the cathode material for a high voltage hybrid capacitor

作     者：Jian-ling Li Fei Gao Yan Jing Rui-ying Miao Ke-zhong Wu Xin-dong Wang 

作者机构：School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Department of Chemistry and Material Science Hebei Normal University Shijiazhuang 050016 China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2009年第16卷第5期

页      面：576-580页

核心收录：

学科分类：080503[工学-材料加工工程] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：manganese dioxide hybrid capacitor high voltage high energy density 

摘      要：Manganese dioxide （MnO2） was prepared using the ultrasonic method. Its electrochemical performance was evaluated as the cathode material for a high voltage hybrid capacitor. And the specific capacitance of the MnO2 electrode reached 240 F·g^-1. The new hybrid capacitor was constructed, combining A1/Al2O3 as the anode and MnO2 as the cathode with electrolyte for the aluminum electrolytic capacitor to solve the problem of low working voltage of a supercapacitor unit. The results showed that the hybrid capacitor had a high energy density and the ability of quick charging and discharging according to the electrochemical performance test. The capacitance was 84.4 μF, and the volume and mass energy densities were greatly improved compared to those of the traditional aluminum electrolytic capacitor of 47 μF. The analysis of electrochemical impedance spectroscopy （EIS） showed that the hybrid capacitor had good impedance characteristics.