TiV2.1Nix（x=0.2～0.6）贮氢合金的相结构及电化学性能  

The Phase Structures and Electrochemical Properties of TiV2.1Nix (x=0.2～0.6) Hydrogen Storage Alloys

作　　者：代发帮[1] 陈立新[1] 刘剑[1] 郑坊平[1] 张志鸿[1] 雷永泉[1] 

机构地区：[1]浙江大学,浙江杭州310027

出　　处：《稀有金属材料与工程》2005年第9期1500-1504,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50271064)

摘　　要：系统研究了TiV2.1Nix(x=0.2,0.3,0.4,0.5,0.6)贮氢合金的相结构及电化学性能。XRD及SEM分析表明:合金均由体心立方(bcc)结构的V基固溶体主相和TiNi基第二相组成;随着Ni含量x的增加,合金中V基固溶体主相的相含量和晶胞参数逐渐减小,TiNi基第二相含量逐渐增多,且当x≥0.4时,TiNi基第二相组织沿主相晶界形成明显的三维网络状结构。电化学测试表明:随着x的增加,合金的高倍率放电性能及循环稳定性均得到显著改善;但当x从0.4增加到0.6时,合金的活化性能变差,最大放电容量降低。在研究的合金中,TiV2.1Ni0.4表现出较好的综合性能。The phase structures and electrochemical properties of TiV2.1 Nix （x=0.2, 0.3, 0.4, 0.5, 0.6） hydrogen storage alloys have been investigated systematically. XRD and SEM show that all the alloys consist of a V-based solid solution main phase with b.c.c, structure and a TiNi-based secondary phase. The abundance and lattice parameters of main phase decrease with the increase of nickel content, while the abundance of TiNi-based secondary phase increases at the same time. The TiNi-based secondary phase forms a visible three-dimensional network along the grain boundaries of V-based solid solution main phase as x increases beyond 0.4. Electrochemical measurements show that the high-rate-dischargeability and cycling stability are hoticeably improved as x increases. However, when x≥0.4, the activation behavior and the maximum discharge capacity decline with the increase of nickel content. Among the studied alloys, the TiV2.1Ni0.4 has the best overall electrochemical performance.

关 键 词：贮氢合金 V基固溶体 相结构 电化学性能 金属氢化物电极 

分 类 号：TG139.7[一般工业技术—材料科学与工程]