75% La(Ni0.85Co0.15)5-x(Mn0.4Al0.3)x+12.5% Mg2Ni(x=0,0.3,0.6)合金储氢性能研究

Study on the Hydrogen-storage Characteristics of 75%La (Ni0.85Co0.15)5-x (Mn0.4Al0.3)x+12.5%Mg2Ni (x=0,0.3,0.6)Alloys

关键词:  合金  La-Mg-Ni基储氢合金  储氢性能  循环寿命

Key words:  alloy  La-Mg-Ni based alloy  hydrogen-storage characteristics  cycle life

摘要:

利用高频感应熔炉制备摩尔比率为75%La(Ni_0.85Co_0.15)_5-x(Mn_0.4Al_0.3)_x+12.5%Mg₂Ni(x=0, 0.3,0.6)合金,测试合金的储氢性能,分析Mn、Al元素组合对合金储氢性能的影响。结果发现,合金均由多相组成,其中主相分别是CaCu₅型的LaNi₅相和PuNi₃型的(La,Mg)Ni₃相。随着元素(Mn,Al)含量增大,合金电极的循环稳定性有一定的改善,80次循环放电容量保持率从x=0时的59.1%提高到x=0.6时的74.5%。

Abstract:

The 75%La (Ni_0.85Co_0.15)_5-x (Mn_0.4Al_0.3)_x+12.5%Mg₂Ni (x=0, 0.3,0.6)alloys were prepared by high frequency induction furnace and their hydrogen-storage characteristics were tested systematically.The result showed that the alloys consist of multi-phases, and the main phases were LaNi₅ phase with a hexagonal CaCu₅-type structure and LaNi₃ phase with PuNi₃-type structure, and the stability of charging-discharging cycle was improved as the content of metals (Mn, Al) increased.The discharge capacity retention after 80 charging-discharging cycles increased from 59.1% (x=0) to 74.5% (x=0.6).