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采用感应熔炼和热处理的方法制备La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75?xFex(x=0~0.20)合金,并研究合金的相结构和电化学储氢性能。全部合金均为单一的具有CaCu5结构的LaNi5相,LaNi5相的晶格常数a和晶胞体积随着x值的增加而增大。最大放电容量随着x值的增加从319.0mA·h/g(x=0)降低到291.9mA·h/g(x=0.20)。在1200mA/g的电流密度下HRD值从53.1%(x=0)降低到44.2%(x=0.20)。合金电极的循环稳定性随着x值的增加而增强,这主要归因于合金抗粉化能力的增强。
The alloy La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75? XFex (x = 0 ~ 0.20) was prepared by induction melting and heat treatment. The phase structure and electrochemical hydrogen storage properties of the alloy were also investigated. All alloys are single LaNi5 phase with CaCu5 structure. The lattice constant a and unit cell volume of LaNi5 phase increase with the increase of x value. The maximum discharge capacity decreased from 319.0mA · h / g (x = 0) to 291.9mA · h / g (x = 0.20) as the value of x increased. HRD decreased from 53.1% (x = 0) to 44.2% (x = 0.20) at a current density of 1200 mA / g. The cycling stability of the alloy electrode increases with the increase of x value, which is mainly attributed to the enhancement of anti-chalking ability of the alloy.