Influence of heat treatment on electrochemical properties of Ti_(1.4)V_(0.6)Ni alloy electrode containing icosahedral quasicrystalline phase  

热处理对包含正二十面体准晶相Ti_(1.4)V_(0.6)Ni合金电极的电化学性能的影响(英文)

作　　者：刘万强[1,2] 张姗姗[1,2] 王立民[2] 

机构地区：[1]长春理工大学材料科学与工程学院,长春130022 [2]中国科学院长春应用化学研究所,稀土资源与利用国家重点实验室,长春130022

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第12期3034-3038,共5页中国有色金属学报（英文版）

基　　金：Project (20112216120001) supported by the Doctoral Program of Tertiary Education of the Ministry of Education of China;Project(21215141) supported by the Natural Science Foundation of Jilin Province, China;Project (20921002) supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China;Projects (21073179, 61106050) supported by the National Natural Science Foundation of China;Project (BE2012047) supported by Scientific and Technological Supporting Program of Jiangsu Province of China and GS Yuasa Corporation of Japan;Project (11KZ38) supported by and Scientific and Technological Pillar Project of Changchun, China

摘　　要：The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysis. Electrochemical properties including the discharge capacity, the cyclic stability and the high-rate discharge ability are tested. X-ray powder diffraction analysis shows that after heat treatment at 590 °C for 30 min, all samples mainly consist of the icosahedral quasicrystal phase (I-phase), Ti2Ni phase (FCC), V-based solid solution phase (BCC) and C14 Laves phase (hexagonal). Electrochemical measurements show that the maximum discharge capacity of the alloy electrode after heat treatment is 330.9 mA?h/g under the conditions that the discharge current density is 30 mA/g and the temperature is 30 °C. The result indicates that the cyclic stability and the high-rate discharge ability are all improved. In addition, the electrochemical kinetics of the alloy electrode is also studied by electrochemical impedance spectroscopy (EIS) and hydrogen diffusion coefficient (D).研究了热处理前后Ti1.4V0.6Ni合金的结构和电化学性能。采用X射线粉末衍射(XRD)方法分析合金的结构。电化学特性包括放电容量、循环稳定性和高倍率放电性能等。XRD衍射分析表明,在590°C热处理30min的合金,主要包含正二十面体准晶相、Ti2Ni(FCC)相、V基固溶相(BCC)和C14Laves相(Hex)。电化学测试显示,热处理后在30°C和放电电流密度为30mA/g的条件下,合金电极的最大放电容量可达330.9mA·h/g,并且循环稳定性和高倍率放电性能也得到改善。此外,通过电化学阻抗和合金内部氢的扩散系数研究了合金电极的动力学性能。

关 键 词：QUASICRYSTAL Ti1.4V0.6Ni alloy electrochemical properties cyclic stability high-rate discharge discharge capacity 

分 类 号：TG166.5[金属学及工艺—热处理]