物理化学学报 >> 2007, Vol. 23 >> Issue (05): 738-742.doi: 10.3866/PKU.WHXB20070522

研究简报 上一篇    下一篇

Y掺杂对氢氧化镍电极高温性能的影响

任俊霞; 周震; 阎杰   

  1. 南开大学新能源材料化学研究所, 天津 300071
  • 收稿日期:2006-11-14 修回日期:2006-12-12 发布日期:2007-04-28
  • 通讯作者: 周震 E-mail:zhouzhen@nankai.edu.cn

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 E-mail:zhouzhen@nankai.edu.cn

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摘要： 合成了内掺稀土元素Y的β-Ni(OH)2和α-Ni(OH)2材料, 并通过XRD、TEM、CV 和充放电测试等方法研究了Y元素对这两种晶型活性材料的结构、形貌以及高温电化学性能方面的影响, 发现Y元素可显著提高β-Ni(OH)2和α-Ni(OH)2材料的高温性能, 且作用机理相同, 均是通过提高析氧过电位来改善镍电极的高温充电效率. 但是α-Ni(OH)2在高温下的相稳定性仍有待提高.

关键词: MH/Ni电池, 镍电极, 高温性能, 充电效率, 稀土元素

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