La15Fe77-xNixMn5B3(x=55,60,65,70,75)储氢合金的结构与电化学性能研究  

Structural and Electrochemical Properties of La_(15)Fe_(77-x)Ni_xMn_5B_3 (x=55,60,65,70,75) Hydrogen Storage Alloys

作　　者：王宏莉[1,2] 闫慧忠[3,2] 李金[3,2] 李宝犬 王利[3,2] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021 [2]包头稀土研究院,内蒙古包头014030 [3]稀土冶金及功能材料国家工程研究中心,内蒙古包头014030

出　　处：《稀土》2012年第2期1-5,共5页Chinese Rare Earths

基　　金：国家自然科学基金地区科学基金项目(51061001)

摘　　要：用熔炼-快淬工艺制备La15Fe77-xNixMn5B3(x=55,60,65,70,75)储氢电极合金。采用XRD、SEM、EDS及电化学方法研究合金的组织结构、放氢平台特性和电化学性能。研究结果表明,La15Fe77-xNixMn5B3(x=55,60,65,70,75)合金均为多相结构,主相是LaNi5相,另外还有(Fe,Ni)相和La3Ni13B2相。随Ni含量增加,合金电极的最大放电容量逐渐增加,活化次数明显减少,放氢平台特性变好,高倍率放电性能明显改善。In this paper the La15Fe77-xNixMn5B3（x=55,60,65,70,75） hydrogen storage electrode alloys were prepared by vacuum melting and rapid quenching method.Through XRD,SEM,EDS and electrochemical methods,the structural,P–C isotherms and electrochemical properties of the alloys were studied.The results show that the La15Fe77-xNixMn5B3（x=55,60,65,70,75） alloys exhibit multiphase structure composed of LaNi5 main phase,La3Ni13B2 phase and（Fe,Ni） phase.With increasing Ni content in the alloys,the plateau property for hydrogen desorption becomes better,the maximum discharge capacity increases and the activation numbers decreases,and the high rate discharge（HRD） properties are improved.

关 键 词：NI/MH电池 La-Fe-B系储氢合金 Ni含量 组织结构 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]