Influence of Zr Addition on Structure and Performance of Rare Earth Mg-Based Alloys as Anodes in Ni/MH Battery

Metals

Shujun Qiu²  Jianling Huang³  Hailiang Chu²  Yongjin Zou²  Cuili Xiang²  Huanzhi Zhang²  Fen Xu²  Lixian Sun²  Liuzhang Ouyang¹  Huaiying Zhou² 

[1] School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China; E-Mail:;Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China; E-Mails:;School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; E-Mail:

关键词: hydrogen storage;    rare earth Mg-based alloy;    Ni/MH battery;    elemental substitution;    electrochemical performance;   

DOI  :  10.3390/met5020565

来源: mdpi

【 摘 要 】

In this study, the substitution of Mg with Zr in La_0.7Mg_0.3(Ni_0.85Co_0.15)_3.5 was carried out with the purpose of improving the electrochemical performances. The structural and hydrogen storage properties in both gas-solid reaction and the electrochemical system were systematically studied on La_0.7(Mg_0.3−xZr_x)(Ni_0.85Co_0.15)_3.5 (x = 0.05, 0.1, 0.2, 0.3) alloys. Each tested alloy is composed of LaNi₃ phase, LaNi₅ phase and ZrNi₃ phase with different phase abundances. The electrochemical studies indicated that all Zr-substituted anodes possessed a much higher cycling capacity retention than pristine La_0.7Mg_0.3(Ni_0.85Co_0.15)_3.5. However, the maximum discharge capacity was reduced with the increase of Zr content. The potential-step tests showed that the diffusion of hydrogen atoms inside the anodes was decelerated after the introduction of Zr.

【 授权许可】

CC BY   
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