添加Mg的非晶态LaMg11Zr+200Ni合金的性能

摘要

采用机械合金化法制备LaMg11Zr+200%Ni+x%Mg(x=0、5和10)合金,研究了镁含量x对产物结构和电化学性能的影响.球磨20 h后,LaMg11Zr+200%Ni+x%Mg合金呈非晶态,颗粒随x的增加而细化.LaMg11Zr+200%Ni+x%Mg合金电极的活化性能较好,最大放电容量随着x的增加而增大,但循环稳定性降低.当x=10时,以50 mA/g的电流放电至截止电位-0.6 V,合金电极的最大放电比容量为994.8 mAh/g,第30次循环的容量保持率为26.0%.合金电极的高倍率放电性能随着放电电流的增大而减弱,随着x的增加而增强.%LaMg11Zr+ 200％Ni + x ％ Mg( x ＝ 0,5 and 10)alloys were prepared by means of mechanical alloying, the effects of Mg content x on structure and electrochemical performance of the products were studied. After 20 h ball-milling, the LaMg11Zr + 200％Ni + x ％ Mg alloys were amorphous, the grains get finer with the increasing of x. The activation behavior of LaMg11Zr + 200％ Ni + x ％ Mg alloy electrodes was fine, the maximum discharge capacity increased with the increasing of x, but the cycle stability decreased. When x ＝ 10 and discharged at the current of 50 mA/g to the cut-off voltage - 0.6 V, the maximum specific discharge capacity of the alloy electrode was 994.8 mAh/g, the capacity retention rate at the 30th cycle was 26.0％ .The high rate discharge ability of the alloy electrodes decreased with the increasing of discharge current,increased with the increasing of x.