二氧化锰在Li_2SO_4水溶液中的电容性能研究  

Capacitance performance of MnO_2 in Li_2SO_4 aqueous solution

作　　者：黄震雷 丛文博[1] 张宝宏[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：《应用科技》2006年第12期64-67,共4页Applied Science and Technology

基　　金：哈尔滨工程大学基础研究基金资助项目(HEUF04066).

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1 mol／L Li2SO4电解液中的电容性能．结果表明,MnO2电极在1 moL／L Li2SO4电解液中具有优良的电容性能,以3 mA／cm2电流密度恒流充放电时,单电极比容量可达239．9 F／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．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.

关 键 词：超级电容器 MNO2 Li2SO4溶液 比容量 

分 类 号：TM53[电气工程—电器] TM911