V_(2．1)TiNi_(0.4)Gd_x贮氢合金的结构和电化学性能研究  

Structure and electrochemical properties of V_(2.1)TiNi_(0.4)Gd_x for hydrogen storage

作　　者：周怀营[1] 钟燕[1] 

机构地区：[1]桂林电子科技大学信息材料科学与工程系,广西桂林541004

出　　处：《广西大学学报（自然科学版）》2008年第3期275-279,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50571030)

摘　　要：本论文开展了系列V_(2.1)TiNi_(0.4)Gd_x(x=0,0.03,0.05,0.07,0.09)贮氢合金的相结构和电化学性能研究.测试结果表明,系列V_(2.1)TiNi_(0.4)Gd_x合金均由体心立方结构的V基固溶体主相和第二相组成.当Gd含量x≤0.03时,合金的第二相为体心立方结构的TiNi基相,当Gd含量x>0.03时,第二相为GdNi_5相,且主相的晶格常数随着x的增大而增大.添加Gd会降低V_(2.1)TiNi_(0.4)合金的活化性能、最大放电容量和高倍率放电性能,但在x=0.05时,合金的循环稳定性略有提高,经过30次充放电循环后,其容量保持率为24.67%.A series of experiments have been done to investigate the microstructure and electrochemical properties of V2.1TiNi0.4Gdx （x = 0, 0. 03, 0. 05, 0. 07, 0. 09） alloys for hydrogen storage. It is found that all these alloys consist of a V-based solid solution main phase with a bcc structure and a secondary phase,where the secondary phase is TiNi-based phase when x≤0.03,and changes into GdNi5phase as x〉0.03. And the lattice constants of the main phase expand with the increase of Gd content. The addition of Gd leads to a difficult activation,a lower maximum discharge capacities and a depressed high-rate discharge ability comparing with V2.1TiNi0.4alloy. However,when the Gd content reached to 0. 05,the cycling stability of V2.1TiNi0.4Gdx alloy has retention is 24. 67% after 30 charge/discharges.

关 键 词：钒基贮氢合金 V2.1TiNi0.4Gdx Gd含量 电化学性能 

分 类 号：TG146.413[一般工业技术—材料科学与工程]