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采用磁悬浮熔炼方法制备(La0.8Nd0.2)2Mg(Ni0.8-xCo0.1Mn0.1Alx)9(x=0,0.05,0.1,0.15)系列合金,系统研究了Al替代Ni对合金相结构、储氢性能及电化学性能的影响。XRD分析表明,铸态合金分别由LaNi5相及LaNi3相组成;P-C-T测试显示随着Al替代量的增加,在相同温度下,合金的最大吸氢量先增加后减少;电化学测试表明,随着x增加,合金电极的最大放电容量逐渐降低,最大放电容量由x=0时的347mA.h/g逐渐下降到x=0.15时的263mA.h/g。
A series of (La0.8Nd0.2) 2Mg (Ni0.8-xCo0.1Mn0.1Alx) 9 (x = 0,0.05,0.1,0.15) alloys were prepared by the magnetic levitation melting method. The phase structure, Hydrogen storage and electrochemical properties. XRD results show that the as-cast alloys consist of LaNi5 phase and LaNi3 phase, respectively. PCT tests show that with the increase of Al substitution, the maximum hydrogen absorption of the alloy first increases and then decreases at the same temperature. Electrochemical tests show that with the increase of x, the maximum discharge capacity of the alloy electrode gradually decreases. The maximum discharge capacity decreases from 347mA.h / g at x = 0 to 263mA.h / g at x = 0.15.