保压时间对储氢合金电极电化学性能的影响  

Effects of the Pressure-Holding Time on the Electrochemical Properties of Mm_(0.3)Ml_(0.7)Ni_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3) Metal Hydride Electrodes

作　　者：田晓[1] 刘向东[2] 姚占全[2,3] 海山[1] 

机构地区：[1]内蒙古师范大学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 [2]内蒙古工业大学,内蒙古呼和浩特010051 [3]内蒙古农业大学,内蒙古呼和浩特010018

出　　处：《稀有金属材料与工程》2012年第4期677-680,共4页Rare Metal Materials and Engineering

基　　金：内蒙古自治区自然科学基金(2010MS0804);内蒙古师范大学科研基金(ZRYB09007)

摘　　要：在不同保压时间下制备Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3储氢合金电极,研究保压时间对合金电极的活化性能、最大放电容量、放电特性和循环稳定性的影响规律和机制。结果表明,保压时间对合金电极的活化性能基本无影响。合金电极的其它电化学性能随保压时间的增加均呈现出先变好后变坏的变化规律,保压时间为15min时,合金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加速和内阻减小。The Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3 metal hydride electrodes were prepared at pressure-holding time of t（t=10,15,20 and 25 min）.The effects of the pressure-holding time on the activation performance,maximum discharge capacity,discharge potential characteristic and cycle stability of the electrode were investigated.The mechanism of the effect of the pressure-holding time on the electrochemical properties of metal hydride electrodes was also discussed in detail.The results show that the pressure-holding time has no effect on the activation performance of the electrode basically,and the other electrochemical properties of the electrodes are improved firstly and then degenerated with increasing of pressure-holding time.The electrode at pressure-holding time of 15 min exhibits the best electrochemical properties.The improvements of the electrochemical properties are attributed to the increase of the charge-transfer reaction rate on the alloy and the decrease of the internal resistance of the electrodes.

关 键 词：储氢合金 储氢电极 保压时间 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]