Ti_(1.0)V_(1.1)Mn_(0.5)Ni_x贮氢合金结构和电化学性能研究  

Structure and Electrochemical Properties of Ti_(1.0)V_(1.1)Mn_(0.5)Ni_x

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：《稀有金属》2007年第2期160-164,共5页Chinese Journal of Rare Metals

基　　金：秦皇岛市科研成果转化基金(A561)资助项目

摘　　要：研究了Ti1.0V1.1Mn0.5Nix(x=0.4,0.5,0.6,0.7,0.8,1.0)贮氢合金的相结构和电化学性能。结果表明,所有合金都由两相组成,主相为具有bcc结构的钒基固溶体相,第二相则随着镍含量的增加从C14型Laves相转变成为bcc结构的TiNi基相。合金中的主相晶胞参数随镍含量增加而减小,但C14型Laves相晶胞参数随之增大。SEM照片显示合金中呈树枝晶的主相被三维网络状的第二相包围。电化学性能测试表明,x=0.4的合金电极要比其他合金电极更易活化,但当x=0.7时合金具有最大的放电容量,293 K时放电容量为258.2 mAh.g-1,333 K时放电容量达到了404 mAh.g-1,所有电极放电容量都随温度升高而增大。电极的倍率放电性能随着镍含量的增大得到改善。电化学P-C-T曲线表明,增加镍含量后,合金电极放氢平台压升高。The structure and electrochemical properties of Ti1.0V1.1Mn0.5Nix （x =0.1, 0.5, 0.6, 0.7, 0.8, 1.0） solid solution alloys were studied. It was found that these alloys consisted of a main solid solution phase with bcc structure and a secondary phase which transferred from C14 type Laves phase into Ti- Ni-based phase with increasing Ni content. Increasing x led to lattice parameter shrinkage of the main phase and TiNi-based phase, while that of C14 type Laves phase changed reversely. SEM shows that these alloys formed dendritic crystal. Ti1.0V1.1Mn0.5Ni0.4 showed easier activation behavior. The maximum discharge capacity was 258.2 mAh·g^-1 at 293 K and 404 mAh·g^- 1 at 333 K for x = 0.7. The discharge capacity increased with the increase of temperature. P-C-T isotherms indicated that Ti1.0V1.1Mn0.5Ni0.7 alloy showed higher desorption plateau pressure than Ti1.0V1.1Mn0.5Ni0.4 alloy.

关 键 词：MH-NI电池 固溶体合金 负极材料 电化学性能 P-C-T曲线 

分 类 号：TG146.4[一般工业技术—材料科学与工程] O611.61[金属学及工艺—金属材料]