采用X射线衍射技术(XRD)、电池程控测试仪和电化学工作站等技术手段,研究了少量Mo替换Ni对La0.75Mg0.25Ni3.xMox(x=0～0.5,原子分数/％,下同)贮氢电极合金相结构及电化学性能的影响.结果表明:La0.75 Mg0.25Ni3.5xMox合金具有多相结构,主相由Gd2 Nb型结构的La2 Ni7和CaCu5型结构的LaNi5构成,合金活化性能良好,经过4次充放电过程基本都能达到活化状态.当Mo的加入量达到0.3％时,合金中出现MoNi1,,且La2 Ni7和LaNi5的点阵参数随之增大;合金的高倍率放电(HRD)性能显著提高,HRDI-900mA愚由82.58％(x=0)增加到86.72％(x=0.5);循环稳定性能(S100)也得到较大改善,呈现先增加后降低的变化趋势,x=0.3时循环稳定性能最好,S100达到76.61％,但合金的最大放电比容量(Cmax)逐渐降低.
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