成型压力对Mm(NiCoMnAl)_5/5%Mg_2Ni复合储氢合金电极电化学性能的影响  

Effects of Compaction Pressure on the Electrochemical Properties of Mm(NiCoMnAl)_5/5% Mg_2Ni Hydrogen Storage Alloy Electrode

作　　者：海山[1,2] 田晓[1,2] 宋志强[1,2] 桂文龙[1,2] 特古斯[1,2] 特木日朝日格 

机构地区：[1]内蒙古师范大学物理与电子信息学院,内蒙古呼和浩特010022 [2]功能材料物理与化学自治区重点实验室,内蒙古呼和浩特010022 [3]通辽广播发射中心台,内蒙古通辽028000

出　　处：《河北师范大学学报（自然科学版）》2013年第1期29-33,共5页Journal of Hebei Normal University：Natural Science

基　　金：内蒙古自治区自然科学基金(2010MS0804);内蒙古高等学校科学研究基金(NJZY11036);内蒙古师范大学科研基金(ZRYB09007)

摘　　要：在不同成型压力下制备了Mm(NiCoMnAl)5/5%Mg2Ni复合储氢合金电极,研究了成型压力对合金电极的活化性能、最大放电容量、放电特性、循环稳定性和高倍率放电性能的影响规律.结果表明,成型压力对合金电极的活化性能基本无影响,合金电极的最大放电容量、放电特性和循环稳定性随成型压力的增大均呈现出先增大后减小的变化规律,合金电极的高倍率放电性能随成型压力的增大而变小.综合考虑,在成型压力为11t时,合金电极展示了最佳的综合电化学性能,电化学性能的改善主要归因于合金电极的电荷转移速度的加快.The Mm（NiCoMnAl）5/5 % Mg2 Ni metal hydride electrodes were prepared at different compaction pressures.The effects of the compaction pressure on the activation performance,maximum discharge capacity,discharge potential characteristic,cycle stability and high-rate dischargeability of the electrode were investigated.The results show that the maximum discharge capacity,discharge potential characteristic,and cycle stability of the electrodes were improved firstly and then degenerated with increasing compaction pressure,but had no effect on the activation performance,and the high-rate dischargeability of the electrode is becoming bad with the increase of compaction pressure.The electrode at compaction pressure of 11 t exhibits the best electrochemical properties.The improvements of the electrochemical properties are attributed to the increase of the charge-transfer reaction rate in the alloy.

关 键 词：储氢合金 储氢电极 成型压力 电化学性能 

分 类 号：O469[理学—凝聚态物理] O646.5[理学—电子物理学]