Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (07): 895-898.doi: 10.3866/PKU.WHXB20060726

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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

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