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研究了球磨制备的La2Mg17+x%Ni(x=50,100,150,200)复合贮氢合金的电化学性能。XRD分析表明:随着Ni含量的增加,复合合金的晶体结构逐渐转变为非晶结构。电化学测试显示:球磨制备的La2Mg17+x%Ni复合贮氢合金在首次循环后即可达最大放电比容量,合金具有较好的活化性能;复合合金的放电比容量也随Ni粉加入量的增加而增大。在经过60 h球磨后制得的非晶态的La2Mg17+200%Ni复合贮氢合金,其303 K下放电比容量为353.1 mAh.g-1。电化学放电比容量的提高应归因于非晶结构的形成以及Ni粉对表面状态的改变。
The electrochemical performance of La2Mg17 + x% Ni (x = 50, 100, 150, 200) composite hydrogen storage alloy prepared by ball milling was studied. XRD analysis shows that the crystal structure of the composite alloy gradually changes to amorphous structure with the increase of Ni content. The results of electrochemical tests show that La2Mg17 + x% Ni composite hydrogen storage alloy prepared by ball milling can reach the maximum specific discharge capacity after the first cycle, and the alloy has better activation performance. The discharge specific capacity of the composite alloy also increases with the addition of Ni powder Increase and increase. The La2Mg17 + 200% Ni composite hydrogen storage alloy prepared after ball milling for 60 h had a discharge capacity of 353.1 mAh · g-1 at 303 K. The increase in specific capacity of electrochemical discharge should be attributed to the formation of amorphous structure and the change of surface state of Ni powder.