中文摘要：

La1．5Mg0．5Ni7-xCox（x=0～1．8）贮氢合金电极由高频感应熔炼加热处理制备得到。合金结构分析表明，合金主相为Ce2Ni7型结构，Mg原子分布在Ce2Ni7型单胞结构的Laves相单元中，而Co原子则分布在CaCu。单元中。随着合金中Co含量的增多，点阵参数和单胞体积呈增大趋势，氢化物变的更加稳定。合金的吸放氢平台在298K条件下介于1．01×10^3～1．01×10^4Pa之间，吸放氢滞后效应较小。舍金电极的电化学分析表明合金具有390mAh／g以上的放电容量和良好的活化特性，Co元素不利于合金电极循环稳定性的改善，氢在合金中的扩散是电极反应的控制步骤。La1．5Mg0．5Ni7.0合金电极表现出较好的综合电化学性能。

英文摘要：

La1.5Mg0.5Ni7-xCox（x=0～1.8） hydrogen storage alloys have been prepared by induction melting followed by an annealing treatment. Structure analyses showed that the main phase of alloys belongs to Ce2Ni7-type structure, Mg atoms are located only at the laves unit of Ce2Ni7-type unit cell, while Co atoms are located only at the CaCu5 unit. As Co content increased, the lattice parameters and cell volume presents an increase trend and the hydrides become more stable. The absorption/desorption plateau of hydrogen ranges from 1.01×10^3～1.01 × 10^4 Pa, and alloys exhibit a small hysteresis factor. Electrochemical analyses showed that all the alloys have a large discharge capacity （above 390mAh/g） and can be easily activated; The Co element is not beneficial to the development of cyclic stability; The control process of alloy electrode reaction is hydrogen diffusion in bulk of alloy. The La1.5 Mg0.5 Ni7.0 alloy exhibits better overall electrochemical properties.