表面处理对镧镨铈贮氢合金电极电化学性能的影响  

The Influence of Surface Treatment on the Electrochemical Properties of Lanthanum-praseodymium-cerium Hydrogen Storage Alloy Electrode

作　　者：李全安[1] 陈云贵[2] 韩满贵[2] 涂铭旌[2] 

机构地区：[1]洛阳工学院材料科学与工程系,河南洛阳471039 [2]四川大学金属材料系,四川成都610065

出　　处：《表面技术》2002年第1期19-22,共4页Surface Technology

基　　金：四川省重点科研成果与转化项目基金资助项目

摘　　要：研究了硼氢化钾、次磷酸钠、热碱溶液处理等表面处理方法对镧镨铈 (LPC)贮氢合金电极电化学性能影响。结果表明 ,在研究范围内 ,各种表面处理方法均明显改善电极的活化性能 ,提高初始放电容量 ;热碱处理的时间和温度对电化学性能影响很大 ;KBH4 处理能明显改善循环稳定性 ,但降低最大容量 ;NaH2 PO4处理能提高最大放电容量 ,但不利于循环稳定性的提高 ;综合比较 ,热碱处理的综合电化学性能最好 ,且工艺简单 。The influence of the surface treatment by hot alkaline solution, alkaline solution containing KBH 4 and alkaline solution containing NaH 2PO 4 on the electrochemical properties of the lanthanum praseodymium cerium hydrogen storage alloy electrode is investigated. The results show that all of treatment methods improve the activation obviously, increase the initial discharge capacity. The temperature and time of the treatment by hot alkaline solution greatly affect electrochemical properties. The treatment by alkaline solution containing KBH 4 improves the cycling stability, but decreases the maximum discharge capacity. The treatment by alkaline solution containing NaH 2PO 4 increases the maximum discharge capacity, but dose not improve the cycling stability. In all methods, the treatment by hot alkaline solution makes the best comprehensive electrochemical properties in this work.

关 键 词：表面处理 稀土元素 贮氢合金 电极 电化学性能 NI-MH电池 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG139.7[金属学及工艺—金属学]