NaOH电解液改善MH/Ni电池自放电性能的机理研究  

Mechanism of Self discharge Performance Improvement in the Ni-MH Batteries with NaOH Electrolyte

作　　者：李晓峰[1] 夏同驰[1] 董会超[1] 魏彦伟[1] 

机构地区：[1]郑州轻工业学院材料与化工学院,河南郑州450002

出　　处：《电化学》2006年第1期85-88,共4页Journal of Electrochemistry

基　　金：河南省教育厅基金项目(200510462012)资助

摘　　要：以NaOH电解液代替KOH能够明显改善MH/N i电池的自放电性能和高温(60℃)充电效率.电化学阻抗和循环伏安测试表明,NaOH电解液的作用可能是改变了H原子于负极表面的吸(脱)附行为,并在一定程度上抑制了负极的析氢过程,从而改善了电池的自放电性能.The self-discharge performance and charge efficiency at 60 ℃ for Ni-MH battery can be markedly enhanced by using NaOH electrolyte instead of KOH electrolyte. Both the results of electrochemical impedance spectroscopy and cyclic voltammetry tests indicate that the separation of H2 from the negative electrode may be partly blocked in the former because of the change of the adsorption/desorption behavior of H on the surface of the negative electrode, thus results in an improvement of self-discharge performance of the battery.

关 键 词：金属氧化物-镍电池 自放电 NaOH电解液 电化学阻抗谱 循环伏安 

分 类 号：TM911[电气工程—电力电子与电力传动]