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Metals 2015, 5(2), 565-577; doi:10.3390/met5020565

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

1
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
2
School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
3
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 18 February 2015 / Revised: 26 March 2015 / Accepted: 1 April 2015 / Published: 8 April 2015
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Abstract

In this study, the substitution of Mg with Zr in La0.7Mg0.3(Ni0.85Co0.15)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 La0.7(Mg0.3xZrx)(Ni0.85Co0.15)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 La0.7Mg0.3(Ni0.85Co0.15)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. View Full-Text
Keywords: hydrogen storage; rare earth Mg-based alloy; Ni/MH battery; elemental substitution; electrochemical performance hydrogen storage; rare earth Mg-based alloy; Ni/MH battery; elemental substitution; electrochemical performance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Qiu, S.; Huang, J.; Chu, H.; Zou, Y.; Xiang, C.; Zhang, H.; Xu, F.; Sun, L.; Ouyang, L.; Zhou, H. Influence of Zr Addition on Structure and Performance of Rare Earth Mg-Based Alloys as Anodes in Ni/MH Battery. Metals 2015, 5, 565-577.

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