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根据正交试验方案,采用共沉淀还原扩散法制备LaMg2Ni9-x-y-zCoxMnyCuz(x=1.8,2.1,2.4,2.7,3.0;y=2.1,2.4,2.7,3.0,3.3;z=0.3,0.6,0.9,1.2,1.5)系列AB3型稀土基储氢合金,研究该系列合金的放电容量和循环稳定性,并用X射线衍射对产物的结构进行微观分析。结果表明:3元素同时替代时合金的放电容量均高于单元素替代时合金的放电容量,但循环稳定性有所下降。合金结构分析表明,合金主相为La4Co3相。该系列合金中LaMg2Ni2.7Co2.1Mn2.7Cu1.5合金电极表现出的综合电化学性能较优。
According to the orthogonal experimental scheme, LaMg2Ni9-xy-zCoxMnyCuz (x = 1.8,2.1,2.4,2.7,3.0; y = 2.1,2.4,2.7,3.0,3.3; z = 0.3,0.6,0.9 , 1.2, 1.5) series AB3 rare earth-based hydrogen storage alloys, the discharge capacity and cycle stability of the series of alloys were studied, and the structure of the product was analyzed microscopically by X-ray diffraction. The results show that the discharge capacity of the alloy is higher than that of the single alloy when the three elements are replaced simultaneously, but the cycle stability decreases. Alloy structure analysis shows that the main phase of the alloy is La4Co3 phase. The LaMg2Ni2.7Co2.1Mn2.7Cu1.5 alloy electrode in the series of alloys shows better comprehensive electrochemical performance.