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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 oC)Ni/MH电池。
Researching and developing hydrogen storage electrode alloys with excellent high rate characteristics is the key technology for developing high power Ni / MH batteries, and has great theoretical significance and commercial value. Based on the discussion of thermodynamics and kinetic behavior of alloys, the effect of microstructure of AB5-type hydrogen storage electrode alloy on its rate discharge performance was studied. The results show that the addition of boron or molybdenum on the B side can significantly improve the high and low temperature discharge capacity of the alloy due to the introduction of non-stoichiometric (B / A> 5) and high catalytic activity of the second phase. Combined with the optimization of the rare earth composition on the A side, a series of MmNi3.55Co0.75Mn0.4Al0.3Bx (Mm is a mixed rare earth) alloy with excellent rate capability have been developed. The alloys are expected to be used in high-power Ni / MH batteries and low-temperature (-35 oC) Ni / MH batteries.