La1.5Mg0.5Ni7-xCox(x=0～1.8)贮氢合金结构和电化学性能研究

功能材料, 2006, 37(2): 265-269.

La1.5Mg0.5Ni7-xCox(x=0～1.8)贮氢合金结构和电化学性能研究

张法亮 ^1, , 罗永春 ^2, , 孙凯 ^3, , 康龙 ^4, , 陈剑虹 ^5,

1.兰州理工大学,材料学院,甘肃,兰州,730050

2.甘肃省有色金属新材料国家重点实验室,甘肃,兰州,730050

3.中国原子能研究院,北京,102413

4.兰州理工大学,材料学院,甘肃,兰州,730050

5.兰州理工大学,材料学院,甘肃,兰州,730050

基金项目: 中国科学院资助项目(50171021)

关键词：贮氢合金 , Ce2Ni7型结构 , 电化学性能 , 动力学

A study on the structure and electrochemical properties of La1.5 Mg0.5 Ni7-xCox (x= 0～1.8) hydrogen storage alloys

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CaCu5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1.01×103～1.01×104Pa之间,吸放氢滞后效应较小.合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.

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La1.5Mg0.5Ni7-xCox(x=0～1.8)贮氢合金结构和电化学性能研究

A study on the structure and electrochemical properties of La1.5 Mg0.5 Ni7-xCox (x= 0～1.8) hydrogen storage alloys

参考文献