系统研究了TiV2.1Nix (x＝0.2, 0.3, 0.4, 0.5, 0.6)贮氢合金的相结构及电化学性能.XRD及SEM分析表明:合金均由体心立方(bcc)结构的V基固溶体主相和TiNi基第二相组成;随着Ni含量x的增加,合金中V基固溶体主相的相含量和晶胞参数逐渐减小,TiNi基第二相含量逐渐增多,且当x≥0.4时,TiNi基第二相组织沿主相晶界形成明显的三维网络状结构.电化学测试表明:随着x的增加,合金的高倍率放电性能及循环稳定性均得到显著改善;但当x从0.4增加到0.6时,合金的活化性能变差,最大放电容量降低.在研究的合金中,TiV2.1Ni0.4表现出较好的综合性能.
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