以钒基合金(TiCr)0.497 V0.42 Fe0.083为基体,通过掺入稀土-镁-镍系A2B7型合金(MlMg)2 (NiCoAl)7作为电催化活性物,采用机械球磨改性方法制备了储氢合金复合电极材料(TiCr)0.497V0.42Fe0.083+x(％,质量分数)(MlMg)2 (NiCoAl)7(x=5～50),系统研究了电催化活性物含量对球磨复合材料微观组织和电化学性能的影响规律.XRD和SEM分析结果表明,随x值的增加,球磨后A2B7型合金颗粒细化后分散并包覆在钒基合金表面上；与铸态钒基合金相比,复合材料中BCC固溶体相结构的晶胞参数a和晶胞体积V均明显减小.电化学性能测试结果表明,球磨复合材料电极的最大放电容量随着x值的增加呈先增加后减小的变化规律,当x≧5时,复合材料电极的放电容量为280～ 433.2mAh·g-1,其100次充放电循环后的电极容量保持率S100为92％～98.9％,表现出良好的电极循环稳定性,其中x=30时的复合材料的综合电化学性能较佳,A2B7型合金的抗腐蚀性能及其包覆效果以及V元素的溶出行为对球磨复合储氢合金电极的电化学循环稳定性具有重要的影响.随A2B7型合金含量x的增加,球磨复合材料电极反应动力学得到显著提高,电极的高倍率放电性能(HRD)和交换电流密度Io值逐渐增加,但氢原子扩散系数有所减小,其中表面电催化活性是影响球磨复合材料( TiCr)0.497V0.42 Fe0.083+x(％)(MlMg)2( NiCoAl)7电极反应动力学过程的主要控制步骤.
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