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›› 2010, Vol. 10 ›› Issue (2): 385-389.

• 材料工程专栏 • 上一篇    下一篇

La掺杂Al代a-Ni(OH)2电极材料的性能

刘长久 赵卫民 陈世娟   

  1. 桂林理工大学化学与生物工程学院 桂林理工大学化学与生物工程学院 桂林理工大学化学与生物工程学院
  • 收稿日期:2009-12-16 修回日期:2010-01-26 出版日期:2010-04-20 发布日期:2010-04-20
  • 通讯作者: 刘长久

Properties of La Doped Al-substituted α-Ni(OH)2 Electrode Material

LIU Chang-jiu ZHAO Wei-min CHEN Shi-juan,   

  1. School of Chemistry and Biology Engineering, Guilin University of Technology School of Chemistry and Biology Engineering, Guilin University of Technology School of Chemistry and Biology Engineering, Guilin University of Technology
  • Received:2009-12-16 Revised:2010-01-26 Online:2010-04-20 Published:2010-04-20
  • Contact: LIU Chang-jiu

摘要: 采用尿素均相沉淀法制备了La掺杂Al代a-Ni(OH)2粉体材料,表征了其微观结构和形貌,并测试了样品作为MH-Ni电池正极活性材料的电化学性能. 结果表明,制备的样品颗粒呈类球形,与Al代a-Ni(OH)2相比,结晶度增强,具有更大的晶格层间距,电极反应具有更好的可逆性和较小的电化学阻抗,在0.1 C下放电比容量达403.04 mA×h/g,放电中值电压较高并稳定于1.29 V,1 C下放电比容量达343.47 mA×h/g,充放电循环50次容量保持率为90.31%,显示了良好的较大倍率放电性能.

关键词: 均相沉淀, Al代a-Ni(OH)2, La掺杂, 结构特征, 电化学性能

Abstract: The La doped Al-substituted α-nickel hydroxide electrode material was prepared by homogeneous precipitation method with urea. Its structure and morphology were characterized, and electrochemical performance investigated. The results show that the La doped Al-substituted particles have a sperical shape and their surface is rough. The sample has a relatively larger interlayer distance and better crystallinity compared with the Al-substituted sample. At 0.1 C charge-discharge rate, the discharge specific capacity of La doped sample reaches 403.04 mA×h/g, simultaneously its discharge mediate potential is higher and maintained at 1.29 V. In addition, the discharge specific capacity of the sample reachs 343.47 mA×h/g at 1 C rate, and the capacity still remains 90.31% after 50 cycles. The La doped Al-substituted α-nickel hydroxide has better high-rate discharge performance.

Key words: homogeneous precipitation, Al substituted α-nickel hydroxide, La doping, structural feature, electrochemical performance

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