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二氧化锰在Li2SO4水溶液中的电容性能研究
引用本文:黄震雷,丛文博,张宝宏.二氧化锰在Li2SO4水溶液中的电容性能研究[J].应用科技,2006,33(12):64-67.
作者姓名:黄震雷  丛文博  张宝宏
作者单位: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
基金项目:哈尔滨工程大学校科研和教改项目
摘    要:采用化学共沉淀法制备了超级电容器电极材料MnO2.采用XRD对其结构进行表征,并用循环伏安、交流阻抗、恒流充放电等测试手段研究了材料在1mol/L Li2SO4电解液中的电容性能.结果表明,MnO:电极在1mol/L Li2SO4电解液中具有优良的电容性能,以3mA/cm^2电流密度恒流充放电时,单电极比容量可达239.9F/g.经1000次恒流充放电循环后,电极比容量下降了11.7%.Nyquist曲线显示电极的电荷转移电阻较小.

关 键 词:超级电容器  Li2SO4溶液  比容量
文章编号:1009-671X(2006)12-0064-04
收稿时间:2006-08-28
修稿时间:2006年8月28日

Capacitance performance of MnO2 in Li2SO4 aqueous solution
HUANG Zhen-lei,CONG Wen-bo,ZHANG Bao-hong.Capacitance performance of MnO2 in Li2SO4 aqueous solution[J].Applied Science and Technology,2006,33(12):64-67.
Authors:HUANG Zhen-lei  CONG Wen-bo  ZHANG Bao-hong
Abstract:MnO2 was synthesized with chemical co-precipitation method. Structure of MnO2 was characterized by XRD, and cyclic vohammetry, electrochemical impedance spectroscopy, galvanostatic charge/discharge tests were used to investigate the electrochemical properties of the MnO2 electrode in the aqueous solutions of 1 mol/L Li2SO4. Excellent capacitance performance was observed in the electrolyte. The specific capacitance was 239.9F/g in l mol/L Li2SO4 under current density of 3mA/cm^2. After 1000 cycles of charge/discharge, the specific capacitance reduced by 11.7%. Nyquist plot shows that the charge transfer resistance was relatively small.
Keywords:MnO2
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