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通过感应容炼制备了La0.8-xRExMg0.2Ni3.2Co0.6(RE=Sm,Dy,0≤x≤0.3)合金。采用X射线衍射分析了该合金的晶体结构,并研究了其电化学性能。结果表明:该合金是由LaNi5主相和LaNi3第二相构成;随着Sm(Dy)取代La量的增加,合金主相单胞体积线性收缩,合金储氢量和放电容量减小,当Sm(Dy)取代量分别为0.1、0.2、0.3时,合金容量由380mA.h/g分别减小到370(362)、355(334)、329(295)mA.h/g,但高倍率放电能力和循环稳定性得到改善,100次循环后的容量损失率由20%分别降低到18%(17%)、16%(14%)、13%(11%)。
La0.8-xRExMg0.2Ni3.2Co0.6 (RE = Sm, Dy, 0≤x≤0.3) alloys were prepared by induction melting. The crystal structure of the alloy was analyzed by X-ray diffraction and its electrochemical properties were studied. The results show that the alloy consists of the main LaNi5 phase and the second phase of LaNi3. With the increase of the amount of La substituted by Sm (Dy), the volume of the main phase of the alloy shrinks linearly and the hydrogen storage capacity and discharge capacity of the alloy decrease. (Dy) were 0.1, 0.2, 0.3 respectively, the capacity of the alloy decreased from 380mA.h / g to 370 (362), 355 (334) and 329 (295) mA.h / g, Capacity and cycle stability are improved with capacity loss rates reduced from 20% to 18% (17%), 16% (14%) and 13% (11%), respectively, after 100 cycles.