稀土贮氢合金 RE(NiCoMnAl)_5 的相结构与电容量关系  

Study of phase constituent and electrochemical properties of RE(NiCoMnAl) 5 hydrogen storage alloys

作　　者：王超群[1] 靳红梅[1] 李国勋[1] 蒋利军[1] 王瑞坤[1] 王永兰[1] 郭宏[1] 

机构地区：[1]北京有色金属研究总院

出　　处：《电源技术》1998年第1期5-7,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金

摘　　要：研究了ＡＢ５型稀土贮氢合金ＲＥ（ＮｉＣｏＭｎＡｌ）５在Ａ侧组分改变下的相结构与电化学性能之间的关系。结果表明：在Ａ侧Ｎｄ（或Ｐｒ）＝０．２时Ｌａ０．８ＲＥ０．２（ＮｉＣｏＭｎＡｌ）５合金的放电容量达最高值（３２０ｍＡｈ／ｇ）；Ｌａ１－ｘＮｄｘ（ＮｉＣｏＭｎＡｌ）５合金的晶胞体积随组分ｘ呈线性减小，少量的Ｎｄ替换对放电容量有良好的影响；退火处理改善了合金的放电容量，但起始活化较慢，可能与表面氧化物的生成有关；快凝条件下晶体织构生长及一次枝晶细化，因而有利于电化学综合性能的提高。The phase constituents and capacity of RE(NiCoMnAl) 5 hydrogen storage alloys with different compositions of rare earth compounds (RE=La 1-x-y-z Nd xPr yCe z) were studied.The results showed that all the La,Nd,Pr and Ce had effect on the electrode performance,and the discharge capacity reached max value (320mAh/g) at Nd(or Pr)=0.2;the cell volume was a linear function to the Nd content x in La 1-x Nd xB 5;the capacity had been improved through annealing procedure,but iniatial active velocity is slow due to the formation of the rare earth oxide.The texture growth and the formation of a fine primary dendrite can be obtained due to rapid solidification,and hence,the electrochemical characteristics were increased.

关 键 词：贮氢合金 相结构 电容量 电极 材料 稀土元素 

分 类 号：TM241.013[一般工业技术—材料科学与工程]