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电化学(中英文) ›› 2006, Vol. 12 ›› Issue (1): 85-88. 

• 研究论文 • 上一篇    下一篇

NaOH电解液改善MH/Ni电池自放电性能的机理研究

李晓峰;夏同驰;董会超;魏彦伟;   

  1. 郑州轻工业学院材料与化工学院,郑州轻工业学院材料与化工学院,郑州轻工业学院材料与化工学院,郑州轻工业学院材料与化工学院 河南郑州450002,河南郑州450002,河南郑州450002,河南郑州450002
  • 收稿日期:2006-02-28 修回日期:2006-02-28 出版日期:2006-02-28 发布日期:2006-02-28

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

LI Xiao-feng~   

  1. (*),XIA Tong-chi,DONG Hui-chao,WEI Yan-wei(Department of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,Henan,China
  • Received:2006-02-28 Revised:2006-02-28 Published:2006-02-28 Online:2006-02-28

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.

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

Abstract: 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 H_2 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.

Key words: Nickel-metal-hydride battery, Self-discharge, NaOH electrolyte, Electrochemical impedance spectroscopy, Cyclic voltammetry

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