Mgx/Mg_2Ni复合储氢合金的机械合金化制备及电极性能  

Mgx/Mg_2Ni Composite Synthesized by Mechanical Alloying and Its Electrochemical Characteristics

作　　者：王仲民[1] 周怀营[1] 顾正飞[1] 成刚[1] 

机构地区：[1]桂林电子工业学院,广西桂林541004

出　　处：《稀有金属材料与工程》2005年第2期316-320,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50171024);广西自然科学基金(0135053)资助项目

摘　　要：利用 Mg_2Ni 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, Mg_2Ni 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 Mg_2Ni相的分解反应。采用模拟电池法测试了 Mgx/Mg_2Ni 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。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.

关 键 词：Mgx/Mg2Ni 球磨 放电容量 

分 类 号：TM912.2[电气工程—电力电子与电力传动]