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采用电弧熔炼制备LaNi4.1Al0.3Mn0.4Si0.2Fex(x=0~0.4)储氢合金,借助XRD、SEM等分析LaNi4.1Al0.3Mn0.4Si0.2Fex合金的晶体结构和相组成,并研究合金的电化学性能。结果表明:合金主要由LaNi5单相组成,当x≥0.1时,在LaNi5主相上分布着些许灰色的第二相。随着LaNi4.1Al0.3Mn0.4Si0.2Fex(x=0~0.4)合金中Fe的加入量增加,合金最大放电容量由295.4mAh/g(x=0)降低到278.2mAh/g(x=0.4),活化次数也由10次增加到18次。同时合金200次循环后的容量保持率却由66.85%(x=0)提高到93.33%(x=0.4)。
The LaNi4.1Al0.3Mn0.4Si0.2Fex (x = 0 ~ 0.4) hydrogen storage alloy was prepared by arc melting. The crystal structure and phase composition of LaNi4.1Al0.3Mn0.4Si0.2Fex alloy were analyzed by XRD, SEM and so on. The electrochemical performance. The results show that the alloy consists mainly of LaNi5 single phase, and when x≥0.1, some gray second phases are distributed on the LaNi5 main phase. With the addition of Fe in LaNi4.1Al0.3Mn0.4Si0.2Fex (x = 0 ~ 0.4) alloy, the maximum discharge capacity decreased from 295.4mAh / g (x = 0) to 278.2mAh / g ), Activation times from 10 to 18 times. At the same time, the capacity retention of the alloy after 200 cycles increased from 66.85% (x = 0) to 93.33% (x = 0.4).