Structure and electrochemical properties of La_(1-x)Mg_(x)Ni_(2.8)Co_(0.4)Mn_(0.1)Al_(0.2)(x=0.25,0.30,0.33)hydrogen storage alloys

作     者：Si Li Huai-Ying Zhou Zhong-Min Wang Jian-Qiu Deng Qing-Rong Yao Si Li;Huai-Ying Zhou;Zhong-Min Wang;Jian-Qiu Deng;Qing-Rong Yao

作者机构：School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin541004China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2020年第39卷第12期

页      面：1464-1468页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the National Natural Science Foundation of China(No.51261003) the Natural Foundation of Guangxi Province(Nos.2012GXNS FGA060002 and 2011GXNSFD018004) 

主　　题：Hydrogen storage alloy Electrochemical properties High-rate dischargeability Electrochemical impedance spectroscopy 

摘      要：La_(1-x)Mg_(x)Ni_(2.8)Co_(0.4)Mn_(0.1)Al_(0.2)(x=0.25,0.30,0.33)alloys were prepared by induction melting followed by annealing treatments(1,073 K)for 10 *** structure and electrochemical properties of La_(1-x)Mg_(x)Ni_(2.8)Co_(0.4)Mn_(0.1)Al_(0.2)(x=0.25,0.30,0.33)hydrogen storage alloys were investigated by X-ray powder diffraction(XRD)and electrochemical measurement *** results reveal that all the alloys mainly consist of LaNi5 phase and La2 Ni7 *** electrochemical experiments demonstrate that the substitution of Mg for La can increase the maximum discharge capacity and improve the high-rate dischargeability of the alloy *** high-rate dischargeability of alloy electrodes increases from 39.4%to63.1%with x increasing from 0.25 to 0.33 at discharge current density of 1,500 mA·g^(-1).However,the addition of Mg reduces the cycling stability of the ***,the results obtained from the electrochemical impedance spectroscopy and linear polarization measurements show that the hydriding kinetics on the hydrogen storage alloys are controlled by charge-transfer step.