物理化学学报 >> 2006, Vol. 22 >> Issue (07): 895 -898 .doi: 10.3866/PKU.WHXB20060726

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正极添加Na2WO4对镍氢电池高温性能的影响

唐致远;张晓阳;刘元刚;柳勇   

  1. 天津大学化工学院, 天津 300072
  • 收稿日期:2005-11-21 修回日期:2006-03-25 发布日期:2006-06-27
  • 通讯作者: 唐致远 E-mail:zytang@tju.edu.cn

High Temperature Performance of Ni-MH Positive Electrode Added with Na2WO4

TANG Zhi-Yuan;ZHANG Xiao-Yang;LIU Yuan-Gang;LIU Yong   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2005-11-21 Revised:2006-03-25 Published:2006-06-27
  • Contact: TANG Zhi-Yuan E-mail:zytang@tju.edu.cn

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摘要： 研究了添加不同比例的Na2WO4对镍正极高温性能的影响, 结果表明, Na2WO4可提高镍氢电池的高温充电效率. 70 ℃条件下, 添加1.0%(w)的Na2WO4时镍正极的充电效率达到85%以上. 此外, Na2WO4的加入也可提高镍氢电池的放电容量、循环寿命和荷电保持率. 研究表明: Na2WO4可以促进镍正极高温下充电正反应的进行, 提高析氧过电位.

关键词: Na2WO4, 高温性能, 正极添加剂, 电池, Ni/MH

Abstract: Different contents of Na2WO4 reagents were added to nickel positive electrode to enhance its high temperature performance. The results showed that, compared with blank electrode without Na2WO4, positive nickel electrode with Na2WO4 displayed an improved high temperature charging performance. Under the conditions of 70 ℃ and 1.0%(w) Na2WO4, high temperature charging efficiency over 85% was obtained for nickel positive electrode. Moreover, Na2WO4 was also favorable for the discharging capacity, cycle life, and charge retention. It was also found that, when Na2WO4 was added into nickel positive electrode, the main charging oxidation reaction of Ni(OH)2 was accelerated as well as oxygen extraction over-potential.

Key words: Sodium tungstate, High-temperature performance, Positive electrode additive, Cell, Ni/MH