La、Ce、Nd和Pr对RE(NiCoMnTi)_5贮氢合金电化学性能的作用机理  

Mechanism of La, Ce, Nd and Pr on the Electrochemical Properties of Multicomponents RE(NiCoMnTi)5 Hydrogen Storage Alloys

作　　者：江建军[1] 雷永泉[2] 孙大林[2] 吴京[2] 王启东[2] 

机构地区：[1]华中理工大学汽车工程系 [2]浙江大学材料系

出　　处：《中国稀土学报》1997年第4期318-324,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家863计划资助项目

摘　　要：系统地研究了稀土（ＲＥ＝Ｌａ１－ｘ－ｙ－ｚＣｅｘＮｄｙＰｒｚ）对贮氢合金ＲＥ（ＮｉＣｏＭｎＴｉ）５电化学性能的影响。结果表明，Ｌａ、Ｃｅ、Ｎｄ和Ｐｒ比例对合金性能有显著影响，ＲＥ＝Ｌａ０．４Ｃｅ０．１Ｎｄ０．２Ｐｒ０．３时，对应合金具有最高放电容量，为２９０ｍＡｈ／ｇ，并有较好的循环寿命。从原子结构和性质角度分析了Ｌａ，Ｃｅ，Ｎｄ和Ｐｒ作用的机理。he electrochemical properties RE(NiCoMnTi)5 hydrogen storage alloys with different composition of rare earth(RE=La_1-x-y-zCe_xNd_yPr_z) components were systematically examined. To display the synthetic effect of rare earth elements on the electrode properties, the comprehensive electrochemical properties graphs including the discharge capacity, high dischargeability and cycle life of alloy electrode vs quasiternary rare earth compositions of multicomponent alloys were drawn by first dividing the component elements into two groups and fixing definite ratios between the two groups, and then using a computer program for engineering graphics. By the optimization of the La∶Ce∶Nd∶Pr ratio, the alloy RE(NiCoMnTi)5 showed a maximum capacity 290 mAh/g and good cycling stability. The higher capacity was due to the larger unit cell volume of the alloy with RE=La0.4Ce0.1Nd0.3Pr0.2, which determined by Xray diffraction analysis.

关 键 词：镧 铈 钕 RE(NiCoMnFi)5 贮氢合金 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]