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在 AB5型混合稀土 -镍系贮氢多元合金的研究中 ,为设计高性能的 AB5型贮氢电极合金 ,人们对其 B侧多元合金化和 A侧稀土组元分别进行了系统地研究。在 B侧金属多元合金化研究工作比较成熟的基础上 ,进行贮氢合金中稀土组元的综合优化研究 ,是挖掘提高 AB5型合金性能另一重要途径。 La、Ce、Nd和 Pr含量及比例对 RE( Ni Co Mn Ti) 5合金电化学性能有很大影响 ,但添加纯 La,Ce和 Nd来调整其稀土成分 ,价格昂贵。本工作通过对 RE( Ni Co Mn Ti) 5合金中稀土组元 ( RE=MlβMm1-β)进行组合优化研究 ,主要还是依赖于市售的混合稀土金属原材料 ,利用不同种类的混合稀土中 L a、Ce、Nd和 Pr组元相应变化 ,来调整其稀土成分。结果表明 ,Ml:Mm比例对其电化学有显著影响。Ml0 .85Mm0 .15( Ni Co Mn Ti) 5对应合金具有最高放电容量为 2 80 m A h/ g和较好的循环寿命 ,并采用Rietveld精细结构法分析 La、Ce、Nd和 Pr作用机理。
In AB5 hybrid rare earth-nickel hydrogen storage multi-component alloys, the B-side multi-alloying and A-side rare earth components have been systematically studied in order to design high-performance AB5-type hydrogen storage electrode alloys. Based on the relatively mature research work on B-side metal alloying, it is another important way to excavate and improve the properties of AB5-type alloy by comprehensively optimizing rare earth elements in hydrogen storage alloys. The contents and proportions of La, Ce, Nd and Pr greatly influence the electrochemical performance of RE (Ni Co Mn Ti) 5 alloy. However, the addition of pure La, Ce and Nd to adjust their rare earth composition is expensive. In this work, the combination optimization of rare earth elements (RE = MlβMm1-β) in RE (Ni Co Mn Ti) 5 alloy relies mainly on the commercially available mixed rare earth metal raw materials, using different types of rare earth rare earth L a , Ce, Nd and Pr components corresponding changes, to adjust its rare earth composition. The results show that the Ml: Mm ratio has a significant effect on the electrochemical. The corresponding alloy Ml0.85Mm0.15 (Ni Co Mn Ti) 5 has the highest discharge capacity of 2 80 mA h / g and good cycle life. The mechanism of action of La, Ce, Nd and Pr is analyzed by Rietveld fine structure method.