Ti-V基固溶体/La-Mg基合金复合储氢材料的结构与电化学性能  

Structure and Electrochemical Characteristics of Ti-V-Based Solid Solution/La-Mg-Based Alloy Composite Hydrogen Storage Material

作　　者：王艳芝[1] 赵敏寿[1] 谌新艳[1] 

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《稀有金属材料与工程》2013年第1期64-69,共6页Rare Metal Materials and Engineering

基　　金：河北省自然科学基金(B2011203074);秦皇岛市科学技术研究与发展计划(201101A129)

摘　　要：两步电弧熔炼法制备Ti0.10Zr0.15V0.35Cr0.10Ni0.30+1%La0.85Mg0.25Ni4.5Co0.35Al0.15复合储氢合金,XRD、SEM、EDS分析结果表明,复合储氢合金的主相是体心立方结构的钒基固溶体相和六方结构的C14Laves相。电化学研究表明:复合过程中存在明显的协同效应;与母体合金电极相比,复合合金电极的P-C-T特性、活化性能、最大放电容量、循环稳定性、低温放电能力和高倍率放电性能均有了显著改善;复合合金电极的电荷转移电阻较小,交换电流密度和氢的扩散系数较大,这些改善可能与第二相的形成有关。Ti0.10Zr0.15V0.35Cr0.10Ni0.30＋1%La0.85Mg0.25Ni4.5Co0.35Al0.15 （mass fraction） composite hydrogen storage alloy was prepared by two-step arc melting. Results of XRD and SEM-EDS show that the main phase of the composite alloy is composed of V-based solid solution phase with bcc structure and C14 Laves phase with hexagonal structure. Electrochemical studies show that distinct synergetic effect appears during the composite process. P-C-T properties, activation performance, maximum discharge capacity, cyclic stability, low temperature dischargeability and high rate dischargeability of the composite alloy are significantly improved. Comparing with the matrix alloy, the composite alloy electrode has smaller charge-transfer resistance, higher exchange current density and bigger hydrogen diffusion coefficient, which seems to be related to formation of the secondary phase

关 键 词：MH Ni电池 Ti—V基固溶体 复合储氢合金 电化学性能 协同效应 

分 类 号：TG139.7[一般工业技术—材料科学与工程]