收稿日期: 2002-12-31
网络出版日期: 2003-05-10
Study on AB5-Type Hydrogen Storage Alloys for High-Power Nickel-Metal Hydride Batteries
Received date: 2002-12-31
Online published: 2003-05-10
Supported by
supported by Knowledge In novation Project of Chinese Academy of Sciences
研究和开发具有优异高倍率特性的储氢电极合金是发展高功率型Ni/MH电池的技术关键,具有重大的理论意义和商业价值。基于合金热力学和动力学行为的讨论,研究了AB5型储氢电极合金的微结构对其倍率放电性能的影响。结果表明,由于非化学计量(B/A >5 )和高催化活性第二相的引入,B侧添加硼或钼可以显著提高合金的高倍率放电容量和低温放电容量。进一步结合A侧稀土成分优化,发展出一类具有优异倍率性能的MmNi3.55Co0.75Mn0.4Al0.3Bx(Mm为混合稀土)合金。该系列合金有望应用于高功率Ni/MH电池和低温(-35℃)Ni/MH电池。
关键词： AB5型储氢合金; 高倍率放电性能; 低温放电性能; 微结构; 高功率Ni/MH电池
叶辉 , 张宏 . 高功率Ni/MH电池用AB5 型负极储氢合金的研究（英文）[J]. 中国科学院大学学报, 2003 , 20(3) : 381 -387 . DOI: 10.7523/j.issn.2095-6134.2003.3.020
Developing hydrogen storage alloys with high-rate dischareability is the key to extend the application of nickel/metal-hydride (Ni/MH)batteries to high-power fields.Based on the discussion of the thermodynamic and kinetic behaviors, the influence of the microstructure on discharge rate behavior of AB-type hydrogen storage alloys has been investigated.The results show that the addition of B and Mo can significantly improve the discharge capability at high-rate and also at low temperature due to the introduction of the non-stoichiometry with B/A >5 and secondary phase with catalytic activity.Again combined with the optimization of the rare earth composition in A side, a kind of MmNi3.55Co0.75Mn0.4Al0.3Bx alloy (Mm:mischmetal)with excellent rate characteristics has been developed.This kind of alloy is promising for Ni/MH batteries in both high power and low temperature applications.
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