中华医学超声杂志

应用化学 ›› 1992, Vol. 0 ›› Issue (2): 123-126.

• 研究简报 • 上一篇    

氢化物电极中Mn的偏析

张昊1, 朱松然1, 罗萍2   

  1. 1. 天津大学应用化学系, 天津 300072;
    2. 机电部十八所 天津
  • 收稿日期:1991-06-10 修回日期:1991-08-30 出版日期:1992-04-10 发布日期:1992-04-10

THE SEGREGATION OF Mn IN HYDRIDE ELECTRODES

Zhang Hao1, Zhu Songran1, Luo Ping2   

  1. 1. Department of Applied Chemistry, Tianjin University, Tianjin 300072;
    2. Tianjin Institute of Power Sources
  • Received:1991-06-10 Revised:1991-08-30 Published:1992-04-10 Online:1992-04-10

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摘要： 镍/氢化物(Ni/MH)电池具有高能量、无电解液浓缩、耐过充放、无毒、不使用贵金属等特点。70年代起已开始这方面的研究[1],近年来尤其活跃。美国、日本等已试制了性能较好的此类电池。我国南开大学、机电部十八所、浙江大学等也已开展了研究。

关键词: 氢化物电极, 偏析, 锰

Abstract: The segregation and dissolution of Mn at the electrodes of hydrogen storage alloys, LaMmMnCoNi and AlMmMnCoNi (Mm-alloy of rare earth rich in lanthanum), have been studied in cycling course using XPS and electron probe techniques. It was observed that Mn inside the electrodes dispersed rapidly to the electrode surfaces in the active stage, forming MnO2. Both the capacities of the electrodes and the Mn content on the electrode surfaces gave maximum values in the cycling course, The segregation and dissolution of Mn in the hydrogen storage alloy electrode containing Al were slower than that in the alloy electrode without Al, The alloy electrode with and without Al in 80% discharge showed a cycling life of 520 and 350 times, respectively. It is concluded that Al may inhibit the segregation and dissolution of Mn and extend the cycling life of the eletrode.

Key words: hydride electrode, segregation, Mn

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