Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (05): 738-742.doi: 10.3866/PKU.WHXB20070522

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Effects of Yttrium-Doping on High-temperature Electrochemical Performances of Nickel Hydroxide Electrodes

REN Jun-Xia; ZHOU Zhen; YAN Jie   

  1. Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2006-11-14 Revised:2006-12-12 Published:2007-04-28
  • Contact: ZHOU Zhen

Abstract: Y-doped β-Ni(OH)2 and α-Ni(OH)2 materials were synthesized, and the influences of Y on the structure, morphology and high-temperature electrochemical characteristics of the two kinds of materials were studied through XRD, TEM, CV, and charging/discharging tests. The results indicated that yttrium improved high-temperature electrochemical performances of β-Ni(OH)2 and α-Ni(OH)2 materials by the same mechanism that the charge efficiency was enhanced through the increase of oxygen evolution overpotentials. However, further efforts are still necessary to improve the phase stability of α-Ni(OH)2 at high temperatures.

Key words: Nickel-metal hydride battery, Nickel hydroxide electrode, High-temperature performance, Charge efficiency, Rare earth element


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