系统研究了Si部分替代Co对La0.7Mg03Ni2.65 Co0.75Mn01储氢电极合金结构和电化学性能的影响.XRD结果显示,随着Si替代量的增加,合金中(La,Mg) Ni3相的丰度逐渐降低,而LaNi5相的丰度逐渐增加,且含Si合金中出现了La2Ni7相.电化学测试表明,Si部分替代Co降低了合金的放电容量,但显著提高了其循环稳定性,改善了其高倍率放电性能.其中Si替代量x=0.15时合金的综合性能较好,合金最大放电容量323mAh/g,75次循环后的容量保持率约为71.9％,1250mA/g电流放电时的HRD可达55％.
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