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用固相扩散法合成了Mg2 -xZrxNi(x =0 ,0 .2 ,0 .3,0 .4 ,0 .5 ,0 .6 )系列合金。XRD结构分析表明 :主相仍为Mg2 Ni;Zr替代Mg使合金的微晶结构发生了改变 ,趋于非晶化 ;添加Zr的合金的容量比由扩散法合成的合金的容量有所提高 ;合金中添加Zr ,提高了电极的放电容量 ,增大了放电平台 ;特别是Zr对六方晶系Mg2 Ni合金结构中Mg的部分取代大幅度提高了电极的循环寿命 ,未经任何处理的Mg1.4Zr0 .6Ni合金电极经 2 5个循环后 ,放电容量仅衰减 4 .11% ,表明添加Zr对提高合金的循环寿命具有重要的作用。
Mg2-xZrxNi (x = 0, 0.2, 0.3, 0.4, 0.5, 0.6) alloys were synthesized by solid-state diffusion method. XRD analysis shows that the main phase is still Mg2Ni; Zr substitutional Mg changes the microcrystalline structure of the alloy and tends to be amorphized; the capacity of the Zr-added alloy is higher than that of the alloy synthesized by the diffusion method; The addition of Zr to the alloy increased the discharge capacity of the electrode and increased the discharge platform. In particular, the partial substitution of Mg in the hexagonal Mg2-Ni alloy structure significantly increased the cycle life of the electrode without any treatment of Mg1. After 2 5 cycles, the discharge capacity of 4Zr0. 6Ni alloy only decreased by 4.11%, indicating that the addition of Zr plays an important role in improving the cycle life of the alloy.