【摘要】 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。更多还原

【Abstract】 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 5 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 MmNi 3.55 Co 0.75 Mn 0.4 Al 0.3 B x 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 (-35 o C) applications.更多还原