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采用机械合金化 (MA)方法制备了 Mg Nix (x=0 .5 ,1.0 ,1.2 5 ,1.5 ,2 .0 )二元贮氢合金。并详细研究了含 Ni量对 MA Mg- Ni系二元合金结构和电化学性能的影响。结果表明 ,当 x=0 .5时 ,MA Mg Ni0 .5 仍为晶态合金 ,较难形成非晶态结构 ,且放电容量很低 ;当 x=1.0～ 2 .0时 ,MA Mg- Ni二元合金可形成非晶相 ,且非晶 Mg- Ni二元合金具有较高的室温放电容量。同时 ,在非晶组成范围内 ,随 Ni含量增加 ,合金最大放电容量逐渐下降 ,平均充放电电位向负方向偏移 ,循环容量衰退速率变小。
Mg Nix (x = 0.5, 1.0, 1.2 5, 1.5, 2.0) binary hydrogen storage alloys were prepared by mechanical alloying (MA) method. The effects of Ni content on the structure and electrochemical properties of MA Mg-Ni binary alloys were investigated in detail. The results show that the MA Mg Ni0.5 is still a crystalline alloy when x = 0 .5, which makes it difficult to form amorphous structure and low discharge capacity. When x = 1.0 ~ 2.0, MA Mg-Ni Binary alloys can form amorphous phase, and amorphous Mg-Ni binary alloys have higher room temperature discharge capacity. At the same time, with the increase of Ni content, the maximum discharge capacity of the alloy gradually decreases and the average charge and discharge potential shifts to the negative direction in the range of amorphous composition. The decay rate of the cycle capacity becomes smaller.