相组成对La0.75Mg0.25Ni3.5储氢合金电化学性能的影响

doi:10.11896/cldb.20010041

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Abstract Compared with traditional AB₅-type alloys, La-Mg-Ni-based superlattice hydrogen storage alloys have superior electrochemical capacity, which has attracted extensive attention in recent years. In this work, an A₂B₇-type La_0.75Mg_0.25Ni_3.5 alloy containing only (La,Mg)₂N_i7 and (La,Mg)₅Ni₁₉ superlattice structure was prepared by annealing the as-cast alloy at 1 203 K for 40 h, and the effects of phase transformation on the electrochemical properties of the alloy has been studied. The results showed that the as-cast alloy contained (La,Mg)Ni₃, (La,Mg)₂Ni₇ and (La,Mg)₅Ni₉ superlattice phases and LaNi₅ phase. During annealing process, LaNi₅ and (La,Mg)Ni₃ phases at the relative edge of the phase diagram disappeared, resulting in the alloy containing only (La,Mg)₂Ni₇ and (La,Mg)₅Ni₉ superlattice phases. The increase of the superlattice phase amount was accompanied by the homogenization of the element composition and the reduction of stress, which not only effectively improved the hydrogen storage capacity of the alloy, but also reduced the pulverization and oxidation during charge/discharge cycling, thus significantly improving the cycling stability of the alloy electrode. The maximum discharge capacity of the alloy electrode increased from 355 mAh·g^-1 of the as-cast alloy to 367 mAh·g^-1 of the annealed alloy, and the cyclic stability significantly increased from 57.97% to 81.47%. However, because of the reduction of the defects and grain boundaries in the alloy, the high-rate discharge capacity of the alloy was slightly reduced.

Key words： Ni/MH battery La-Mg-Ni-based hydrogen storage alloy annealing treatment phase structure electrochemical property

Published: 23 March 2021

CLC number:

TG139.7

Fund:National Natural Science Foundation Youth Fund of China (51801176), Natural Science Foundation Youth Fund of Jiangsu Province (BK20170502), Undergraduate Practice Innovation Training Program for College Students of Jiangsu Province (20191111707Y) and Undergraduate Innovation and Entrepreneurship Training Program/Academic Science and Technology Innovation Fund Program of Yangzhou University (X20190335).

About author:: Qitong Jiao, studying in the Material Forming and Control Engineering Department of the School of Mechanical Engineering, Yangzhou University, is a member of the “New Energy Materials” research team. He has been studying the negative materials of Ni/MH batteries for more than two years, and is proficient in alloy preparation and crystal structure analysis.
Wei Pan, studying in the Material Forming and Control Engineering Department of the School of Mechanical Engineering, Yangzhou University, joined the research team of “New Energy Materials” from Jun. 2017. He has been devoted to improving the electrochemical performance of power batteries, mainly Ni/MH batteries, and is proficient in battery assembly, electrochemical performance testing and analysis.
Jingjing Liu received her Ph.D. degree in chemical engineering from Yanshan University in 2016. She is currently an associate professor in School of Mechanical Engineering, Yangzhou University. Her research inte-rests are advanced hydrogen storage alloys, power batte-ries and metallic functional materials.

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	JIAO Qitong
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	CHEN Jian
	GU Chenyu
	QIU Tian
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Cite this article:

JIAO Qitong,PAN Wei,ZHU Shuai, et al. Effects of Phase Composition on Electrochemical Properties of La_0.75Mg_0.25Ni_3.5 Hydrogen Storage Alloy[J]. Materials Reports, 2021, 35(6): 6140-6145.

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http://www.mater-rep.com/EN/10.11896/cldb.20010041 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6140

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