Effect of AB5 alloy on electrochemical properties of Mm0.80Mg0.20Ni2.56Co0.50Mn0.14Al0.12 hydrogen storage alloy
Effect of AB5 alloy on electrochemical properties of Mm0.80Mg0.20Ni2.56Co0.50Mn0.14Al0.12 hydrogen storage alloy
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DOI：
10.1016/j.powtec.2012.01.026
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发表时间：
2012-05
影响因子：
5.2
通讯作者：
Hongxia Huang;Ke‐long Huang
中科院分区：
文献类型：
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作者：
Hongxia Huang;Ke‐long Huang
La-Mg-Ni基复合材料Mm0.80Mg0.20Ni2.56Co0.50Mn0.14Al0.12- xwt.%采用球磨法成功地合成了AB 5（x=0，10，20，30）合金。系统地研究了复合材料的结构和电化学性能。XRD分析表明，复合材料主要由La 2Ni 7相和LaNi 5相组成。电化学研究表明，合金电极的最大放电容量（Cmax）从361.8 mAh/g（x=0）略微下降到337.9 mAh/g（x=10）、353.9 mAh/g（x=20）和352.8 mAh/g（x=30），而复合电极的循环耐久性显著提高。此外，电化学动力学测量表明，x=20的复合合金电极呈现出最好的整体电化学性能。
The La–Mg–Ni based composites Mm0.80Mg0.20Ni2.56Co0.50Mn0.14Al0.12– xwt.% AB5(x=0, 10, 20, 30) alloys were successfully synthesized by ball milling method. The structure and electrochemical characteristics of composites have been investigated systematically. The XRD spectroscopy shows that all these composites are mainly composed of La2Ni7phase and LaNi5phase. The electrochemical studies suggest that the maximum discharge capacity (Cmax) of alloy electrodes decreases slightly from 361.8 mAh/g (x=0) to 337.9 mAh/g (x=10), 353.9 mAh/g (x=20) and 352.8 mAh/g (x=30), while the cycle durability of the composite electrodes is significantly improved. Moreover, the electrochemical kinetic measurements indicate that the x=20 composite alloy electrode presents the best overall electrochemical properties.