Abstract Present paper investigates Ti0.25Zr0.75Ni1.35-xMn0.65Vx (x = 0, 0.05, 0.1, and 0.15) alloys as anode active materials of metal hydride batteries. The AB2 Laves-type alloys are prepared using arc melting and annealing. The as-cast alloys contain the major C15 and/or C14 intermetallic compounds together with the Ti–Ni and Zr–Ni secondary phases. The annealing promotes the homogeneity of the alloys and dismisses the non-Laves phases. As the V contents increase, the C15-type Laves phase transforms to the C14 structure. In addition, the unit cells of the Laves phase increase as the V contents in the alloys increase. All the studied alloy electrodes reach their maximum discharge capacities during the first 10 activation cycles. After charge/discharge 100 cycles at 300 mAg−1, the discharge capacity retentions of all the studied alloy electrodes keep more than 75%. Annealing treatment and V substitution increase the full discharge capacity from ~230 mAg−1 for N1 alloy to ~430 mAhg−1 for A4 alloy. The synthetic effects between V substitution and annealing are studied on improving the phase structure and the electrochemical properties of AB2-type Laves phase alloys.

中文翻译：

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V取代和退火对作为金属氢化物电池负极材料的Zr基AB2合金的影响

摘要 本文研究了 Ti0.25Zr0.75Ni1.35-xMn0.65Vx (x = 0、0.05、0.1 和 0.15) 合金作为金属氢化物电池的负极活性材料。AB2 Laves 型合金是使用电弧熔化和退火制备的。铸态合金包含主要的 C15 和/或 C14 金属间化合物以及 Ti-Ni 和 Zr-Ni 第二相。退火促进了合金的均匀性并消除了非 Laves 相。随着 V 含量的增加，C15 型 Laves 相转变为 C14 结构。此外，随着合金中 V 含量的增加，Laves 相的晶胞增加。所有研究的合金电极在前 10 次活化循环期间达到其最大放电容量。在 300 mAg−1 下充电/放电 100 次循环后，所有研究的合金电极的放电容量保持率均保持在 75% 以上。退火处理和 V 置换使完全放电容量从 N1 合金的~230 mAg-1 增加到 A4 合金的~430 mAhg-1。研究了V取代和退火对AB2型Laves相合金相结构和电化学性能改善的综合影响。