Effect of rapid solidification treatment on structure and electrochemical performance of low-Co AB5-type hydrogen storage alloy  

作　　者：姚青荣 唐莹 周怀营 邓健秋 王仲民 潘顺康 饶光辉 朱其明 

机构地区：[1]School of Materials and Engineering, Central South University [2]School of Materials Science and Engineering,Guilin University of Electronic Technology [3]Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology [4]School of Science,Guangxi University for Ationalities

出　　处：《Journal of Rare Earths》2014年第6期526-531,共6页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundations of China(51161004,51371061,51001033);Guangxi Natural Science Foundation(2012GXNSFGA060002)

摘　　要：The effect of rapid solidification on structure and electrochemical performance of the LaNi4.5Co0.25Al0.25 hydrogen storage alloy was investigated by X-ray powder diffraction and a simulated battery test, including maximum capacity, cycling stability, self-discharge, and high-rate discharge ability （HRD）. All the melt-spun alloys were single-phase with the CaCu5-type structure （space groupP6/mmm）. In comparison to the as-cast alloy, the rapidly quenched alloys manifested an improved homogeneity of com-position and expanded lattice parameters. The electrochemical measurements showed that the activation property, cycling stability and self-discharge of the alloy electrodes were also improved for the rapid solidified alloys. The HRDof the as-cast alloy was better than those of all the rapidly solidified alloys. As the quenching rate increased, the HRD and exchange current density first decreased and then increased.The effect of rapid solidification on structure and electrochemical performance of the LaNi4.5Co0.25Al0.25 hydrogen storage alloy was investigated by X-ray powder diffraction and a simulated battery test, including maximum capacity, cycling stability, self-discharge, and high-rate discharge ability （HRD）. All the melt-spun alloys were single-phase with the CaCu5-type structure （space groupP6/mmm）. In comparison to the as-cast alloy, the rapidly quenched alloys manifested an improved homogeneity of com-position and expanded lattice parameters. The electrochemical measurements showed that the activation property, cycling stability and self-discharge of the alloy electrodes were also improved for the rapid solidified alloys. The HRDof the as-cast alloy was better than those of all the rapidly solidified alloys. As the quenching rate increased, the HRD and exchange current density first decreased and then increased.

关 键 词：hydrogen storage alloy electrochemical properties rapid solidification quenching rate rare earths 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—合金]