LaNi<sub>5.5</sub>Sn<sub>1.5</sub>-C-Si合金优异的长期吸/放氢循环性能

doi:10.11896/cldb.20010157

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Abstract LaNi₅-based hydrogen storage alloys have wide application prospect in many areas such as gaseous hydrogen storage, hydrogen compressing, Ni/MH batteries etc. Their cycling stability has always been an important problem. In this study, LaNi_5.5Sn_1.5-C-Si alloy with CaCu₅ main phase and a small amount of Ni/Sn phase, C phase and Si phase was prepared by arc melting metallurgical method combined with long time annealing treatment. The evaluation trend in the hydrogen storage performance of the LaNi_5.5Sn_1.5-C-Si alloy during 1 000 hydrogen absorption/desorption cycles are studied in comparison with LaNi₅-base alloys. It is found that with increasing cycle number, the hydrogen storage capacity is slightly decreased, and the hydrogen absorption/desorption plateaus become a little tilted. However, the above changes are far less than that of LaNi₅ alloys. LaNi_5.5Sn_1.5-C-Si alloy preserve a high cycling stability of reach 98% probably because of the buffering effect of the C and Si dispersion phases which relive the pulverization of the alloy particles. Moreover, the alloys have good kinetics performance and can fully absorb hydrogen within 200 s in the temperature range of 383—423 K at 2 MPa. The good hydrogen absorption kinetics may be related to the catalytic effect of the Ni/Sn-rich phase.

Key words： hydrogen storage material AB₅-type alloy hydrogen storage property cycling stability

Published: 23 February 2021

CLC number:

TG139.7

Fund:This work was financially supported by the 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).

Corresponding Authors: liujj@yzu.edu.cn

About author:: Jian Chen, 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 the study of hydrogen storage alloys, and is proficient in structural characterization and measurement of hydrogen storage properties.
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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	CHEN Jian
	GU Chenyu
	YANG Ning
	QIU Tian
	XU Jie
	CHEN Xiangyu
	ZHU Shuai
	JIAO Qitong
	PAN Wei
	LIU Jingjing

Cite this article:

CHEN Jian,GU Chenyu,YANG Ning, et al. Excellent Long-term Hydrogen Absorption/Desorption Cycling Property of LaNi_5.5Sn_1.5-C-Si Alloy[J]. Materials Reports, 2021, 35(4): 4112-4117.

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http://www.mater-rep.com/EN/10.11896/cldb.20010157 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4112

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