期刊
JOURNAL OF POWER SOURCES
卷 301, 期 -, 页码 229-236出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.10.017
关键词
Hydrogen storage alloy; Non-stoichiometry; Phase structure; Electrochemical property
资金
- National High-Tech Research and Development Program of China [2011AA03A408]
- National Basic Research Program of China [2011GB111003]
- Innovation Foundation of BUAA for PhD Graduates
La0.8GdxMg0.2Ni3.15Co0.25Al0.1 (x = 0-0.4) hydrogen storage alloys are prepared by induction melting followed by annealing treatment at 1173 K for 8 h. The effects of non-stoichiometry on phase structure and electrochemical properties with Gd addition are investigated systematically. The results show that Gd addition exerts significant effects on the phase component of the alloys. A appropriate amount of Gd addition (x = 0.1) can increase the abundance of (La,Mg)(2)Ni-7-type phase while that of (La,Mg)(5)Ni-19-type phase decreases. The further increase of Gd content (x >= 0.2) results in appearance of (La,Mg)Ni-3-type, (La,Mg)(7)Ni-16-type and La2MgNi2-type phases. Electrochemical tests reveal that the maximum discharge capacity and cycle life of the alloy electrodes can benefit from the right amount of Gd addition (x = 0.1), both of which are deteriorative with further increasing Gd content. However, the excess amount of Gd (x >= 0.2) jeopardizes the high rate dischargeability of the alloy electrodes obviously owing to the increase of charge transfer resistance on alloy surface. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据