通过少量Y对La的取代,研究了La0.75-xYxMg0.25 Ni3.17Al0.13和La0.75 -xYxMg0.25Ni3.37Al0.13(其中x=0.00,0.05,0.10)体系中Y对合金晶体结构及电化学性能的影响.通过X射线衍射实验、电化学性能测试,结果表明上述两体系主相为Ce2 Ni7相、Pr5Co19相.少量的取代对活化性能、最大放电容量影响不大,但对循环稳定性、放氢平台压影响显著,而且在不同主相结构中,影响效果不一样.当x从0.00增大到0.10时:主相为Ce2Ni7相La0.75-xYxMg0.25Ni3.17Al0.13的S80％由222周下降到112周,放氢平台压则由0.015 MPa上升到0.045 MPa；而主相为Pr5 Co19相La0.75-xYxMg0.25Ni3.37Al0.13的S80％由172周下降到127周,放氢平台压则由0.019 MPa上升到0.076 MPa.
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