Mgx／Mg2Ni复合储氢合金的机械合金化制备及电极性能

Mgx/Mg2Ni Composite Synthesized by Mechanical Alloying and Its Electrochemical Characteristics

摘要:

利用Mg2Ni合金和不同质量百分数的Mg粉(x=10％，30％，50％)混合后球磨制得Mgx／Mg2Ni复合合金。XRD分析证实，Mg2Ni合金和Mg粉混合球磨时无新相生成，Mg粉的添加可有效抑制Mg2Ni合金单独球磨时存在的Mg2Ni相的分解反应。采用模拟电池法测试了Mgx／Mg2Ni复合合金的电极性能，结果表明，Mg量的增加可显著地提高复合合金的放电容量。在球磨的开始阶段，复合合金的放电容量随球磨时间的延长而增加，球磨一定时间后，其放电容量则随球磨时间的延长而迅速降低。放电容量与球磨时间的变化关系体现了球磨对复合合金微结构改变的影响。

Abstract:

Mgx/Mg2Ni(x=10%, 30%, 50%) composites were synthesized by ball milling the mixture of Mg2Ni alloys and Mg powder. XRD analysis show that no new phase was produced, and the decomposability of Mg2Ni phase existed in the milling of solo Mg2Ni alloys is restrained in the milling of Mg2Ni alloys and Mg powder. Electrochemical characteristics of Mgx/Mg2Ni composites at different milling time were evaluated by simulated battery test. It was found that the discharge capacity of Mgx/Mg2Ni composite was obviously improved with increasing content of Mg powder in the milling. The discharge capacity of the composites were enhanced with increasing milling time at the beginning of milling, while a decrease was followed. The relationship between discharge capacity and milling time was mainly influenced by the micstructure of composites caused by ball milling.