储能科学与技术 ›› 2018, Vol. 7 ›› Issue (2): 288-293.doi: 10.12028/j.issn.2095-4239.2017.0142

• 研究开发 • 上一篇    下一篇

羟基镍粉对Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3合金电极电化学性能的影响

丰洪微，范哲超   

  1. 1内蒙古机电职业技术学院冶金与材料工程系，内蒙古 呼和浩特 010070；2内蒙古机电职业技术学院机电工程系，内蒙古 呼和浩特 010070
  • 收稿日期:2017-08-21 修回日期:2017-09-07 出版日期:2018-03-01 发布日期:2018-03-01
  • 通讯作者: 丰洪微（1984—），女，博士，副教授，研究方向为新材料制备与性能，E-mail：fanzhechao83@sina.com。
  • 基金资助:
    内蒙古机电职业技术学院科研课题（NJDZJZR1706）。

Effect of hydroxyl nickel powder on electrochemical properties of Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3 alloy electrode

FENG Hongwei, FAN Zhechao   

  1. 1 Department of Metallurgy and Materials Engineering, Inner Mongolia Technical College of Mechanics and Electrics, Hohhot 010070, Inner Mongolia, China; 2 Department of Mechanical and Electrical Engineering, Inner Mongolia Technical College of Mechanics and Electrics, Hohhot 010070, Inner Mongolia, China
  • Received:2017-08-21 Revised:2017-09-07 Online:2018-03-01 Published:2018-03-01

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摘要： 采用干法及湿法制备了复合储氢电极Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/x%Ni（质量分数）（x=0～300），采用电化学方法测试了合金电极的电化学性能及PCT特性，并分析了复合储氢电极的相结构和微观形貌。结果表明，添加羟基镍粉后的储氢电极在288 K、298 K和308 K时的PCT曲线的放氢平台压力均低于x=0时的平台压力，其中x=200时的平台压力小；复合电极材料中只存在CaCu5型LaNi5相和Ni相，随着羟基镍粉含量的增加，Ni的衍射峰逐渐增强，LaNi5相的峰高减弱，半高宽变宽，在x=200时，对应成分合金电极的PCT平台宽度最大，平台斜度最小；x=200储氢合金电极的循环放电曲线最为平坦，在经历200次充放电循环后，其容量保持率最大；在所研究的电极成分范围内，Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/200%Ni电极的电化学性能最好。

关键词: 储氢合金, 羟基镍粉, PCT特性, 电化学性能

Abstract:

Hydrogen storage composite electrode Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/x% (weight ratio) Ni was prepared by dry method and wet method (x=0～300), the electrochemical properties and PCT characteristics of the alloy electrode were measured by electrochemical method, and the phase structure and micro morphology of the composite hydrogen storage electrode were also analyzed. The results show that when the hydrogen storage electrode was added with hydroxyl nickel powder, the pressure of hydrogen desorption platform of PCT curve at 288 K, 298 K and 308 K were lower than the platform pressure with x=0, in which the platform pressure is small when x=200. There are only CaCu5, LaNi5 phase and Ni phase in the composite hydrogen storage electrode. With the increase of hydroxyl nickel powder content, the diffraction peak of Ni gradually increased, and LaNi5 phase peak height decreased, together with the FWHM broadening. The PCT platform width of the alloy electrode is the biggest and the platform slope is the minimum as x=200. The Mm0.3Ml0.7Ni3.55Co0.75Mn0.4 Al0.3/200%Ni electrode has the best electrochemical performance in the range of the electrode composition studied.

Key words: hydrogen storage alloy, hydroxyl nickel powder, PCT characteristics, electrochemical performance