Influence of Zr Addition on Structure and Performance of Rare Earth Mg-Based Alloys as Anodes in Ni/MH Battery
Influence of Zr Addition on Structure and Performance of Rare Earth Mg-Based Alloys as Anodes in Ni/MH Battery
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DOI：
10.3390/met5020565
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
S. Qiu;Jianling Huang;H. Chu;Y. Zou;C. Xiang;Huanzhi Zhang;F. Xu;Lixian Sun;L. Ouyang;
中科院分区：
文献类型：
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作者：
S. Qiu;Jianling Huang;H. Chu;Y. Zou;C. Xiang;Huanzhi Zhang;F. Xu;Lixian Sun;L. Ouyang;
本研究以提高La0.7Mg0.3（Ni0.85Co0.15）3.5的电化学性能为目的，采用Zr替代Mg，对La0.7Mg0.3（Ni0.85Co0.15）3.5的电化学性能进行了研究。系统研究了La0.7（Mg0.3− xZrO2）（Ni0.85Co0.15）3.5（x = 0.05，0.1，0.2，0.3）合金的结构和在气固反应和电化学体系中的储氢性能。每种合金均由LaNi 3相、LaNi 5相和ZrNi 3相组成，且相丰度不同。电化学研究表明，所有Zr取代的阳极具有比原始的La0.7Mg0.3（Ni0.85Co0.15）3.5高得多的循环容量保持率。但随着Zr含量的增加，合金的最大放电容量降低。电位阶跃测试表明，锆的引入减缓了氢原子在阳极内部的扩散。
In this study, the substitution of Mg with Zr in La0.7Mg0.3(Ni0.85Co0.15)3.5 was carried out with the purpose of improving the electrochemical performances. The structural and hydrogen storage properties in both gas-solid reaction and the electrochemical system were systematically studied on La0.7(Mg0.3−xZrx)(Ni0.85Co0.15)3.5 (x = 0.05, 0.1, 0.2, 0.3) alloys. Each tested alloy is composed of LaNi3 phase, LaNi5 phase and ZrNi3 phase with different phase abundances. The electrochemical studies indicated that all Zr-substituted anodes possessed a much higher cycling capacity retention than pristine La0.7Mg0.3(Ni0.85Co0.15)3.5. However, the maximum discharge capacity was reduced with the increase of Zr content. The potential-step tests showed that the diffusion of hydrogen atoms inside the anodes was decelerated after the introduction of Zr.