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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Improving the phase stability and cycling performance of Ce2Ni7-type RE-Mg-Ni alloy electrodes by high electronegativity element substitution
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Improving the phase stability and cycling performance of Ce2Ni7-type RE-Mg-Ni alloy electrodes by high electronegativity element substitution

机译：通过高电负性元素取代改善Ce2Ni7型Re-Mg-Ni合金电极的相位稳定性和循环性能

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摘要

In the present work, a high electronegativity element substitution strategy was employed to obtain a better corrosion resistance and cycling performance of Ce2Ni7-type La0.83-xYxMg0.17Ni3.1Co0.3Al0.1 (x = 0.0-0.6) alloys. The abundance of the Ce2Ni7-type phase increased as x increased from 0 to 0.2 but it decreased with a further increase in x up to 0.6. The alloy with x = 0.2 further showed a superior discharge capacity (400.6 mA h g(-1)) and high cycling stability (S-320 = 75%). We found that the Y (electronegativity value (Y) = 1.22 (La) = 1.10) element could play an essential role in enhancing the anti-corrosion of alloys based on a theoretical framework of the electronegativity of rare earth elements, thus leading to an excellent cycle lifetime of the alloys. The new alloying designs are expected to provide viable La-Mg-Ni-based intermetallic compounds as anode materials for commercial Ni-MH batteries.
机译：在本作工作中，采用高电负极元素取代策略来获得Ce2Ni7-型La0.83-XYXMG0.17NI3.1CO0.3A10.1（x = 0.0-0.6）合金的更好的耐腐蚀性和循环性能。 CE2NI7型阶段的丰度增加到x从0增加到0.2增加，但随着x高达0.6的进一步增加，它降低了。 具有X = 0.2的合金进一步显示出优异的放电容量（400.6mA H（-1））和高循环稳定性（S-320 = 75％）。 我们发现Y（电信值值（Y）= 1.22＆（La）= 1.10）元素可以在提高基于稀土元素的电负性的理论框架的理论框架方面发挥基本作用，从而引进 对合金的优异循环寿命。 预计新的合金化设计将提供可行的La-Mg-Ni金属间化合物作为商业Ni-MH电池的阳极材料。

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