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为了探索化学计量比B/A(A和B分别为电极合金A侧和B侧元素的总和)以及Co替代Ni对ABx(x=2.5~3.5)型电极合金微观结构及电化学性能的影响,制备了电极合金La0.75Mg0.25Ni2.5Mx(M=Ni,Co;x=0,0.2,0.4,0.6,0.8,1.0).系统地分析测试了合金的微观结构及电化学性能.结果表明,合金的微观结构与电化学性能与化学计量比B/A(相当于M含量x)密切相关.合金均具有多相结构,包括LaNi2,(La,Mg)Ni3和LaNi5相.随化学计量比B/A的增加,合金的主相由LaNi2转为(La,Mg)Ni3+LaNi5相,并且合金的电化学性能,包括放电容量、高倍率放电能力(HRD)、放电电压特性等均显著改善.

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