采用X射线衍射、电子探针和电化学测试研究了La2MgNi7.5-xC01.5A1x(x=O.0～0.5)合金的相结构和电化学性能.XRD结果和EPMA观察表明,A1替代改变了合金的物相组成和物相的丰度.LaNi3相消失,αLa2Ni7相丰度的变化表现为先增加(x从O.0～0.1)后减少(x=O.3和O.5),LaNi5相随合金中A1含量x的增加而明显增加.A1替代Ni降低了合金的最大电化学放电容量和活化性能,但明显改善了La2MgNi7.5Co1.5合金的电化学循环稳定性.
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