镧对Ti-V-Mn-Ni贮氢合金结构及电化学性能的影响  

Effect of Lanthanum Substitution for Partial Vanadium on Microstructure and Electrochemical Properties of Ti-V-Mn-Ni Alloys

作　　者：黄亮[1] 赵敏寿[1] 李佳[1] 侯春平[1] 朱新坚[2] 曹广益[2] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]上海交通大学燃料电池研究所,上海200030

出　　处：《中国稀土学报》2007年第1期74-79,共6页Journal of the Chinese Society of Rare Earths

基　　金：秦皇岛市科研成果转化基金(A561)资助项目

摘　　要：研究了Ti1.0V1.1-xMn0.5Ni0.4Lax(x=0,0.05,0.1,0.15和0.2)贮氢合金的相结构和电化学性能。结果表明,当无La替代时,合金主要含有BCC结构的固溶体相以及少量Laves相。随着La替代量的增加,该合金中C14型Laves相含量增加,并且出现了富镧相,说明镧的添加对合金的相组成产生了明显的影响。当La含量x=0.15时,合金具有最大放电容量Cmax=245.4mAh.g-1;合金电极放电容量随温度升高而增大,当x=0.2,60℃时最大放电容量达到385mAh.g-1。但倍率放电能力没有明显提高。The effect of lanthanum substitution for partial vanadium on the microstructures and electrochemical properties of the electrode alloys Ti1.0V1.1-x Mn0.5Ni0.4Lax （x = 0, 0.05, 0.1, 0.15 and 0.2） was studied. Results show that all the alloys consist of a V-based solid solution main phase with bcc structure and a C 14 laves secondary phase with hexagonal structure. The lattice parameters of the main phase increase with increasing amount of lanthanum. Scanning electron micrographs show that besides the dendritic secondary phase, these alloys also contain lanthanumrich phase, which affects the electrochemical performance of these alloy electrodes significantly. The discharge capacities of the alloys increase with increasing temperature from 293 to 333 K. The cycle life and the rate capability were also investigated

关 键 词：镧 钒基固溶体 电化学性能 MH—Ni电池 稀土 

分 类 号：TG146.4[一般工业技术—材料科学与工程]