Microstructures and electrochemical properties of LaNi3.8-xAlx hydrogen storage alloys

The microstructttres and electrochemical properties of LaNi3.8-xAlx （x=0.0, 0.1, 0.2, 0.3 and 0.4） alloys were studied sys- tematically. The microstructures were identified by X-ray diffraction （XRD） and scanning electronic microscopy （SEM）. The main phases were not changed with the substitution of...

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Bibliographic Details
Published in:Journal of rare earths 2013-05, Vol.31 (5), p.497-501
Main Author: 王伟 陈云贵 李强 杨维才
Format: Article
Language:English
Subjects:
electrochemical properties
hydrogen storage alloy
La5Ni19
rare earths
X-射线衍射
交换电流密度
合金系统
微观结构
扫描电子显微镜
显微组织
电化学性能
贮氢合金
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Summary:The microstructttres and electrochemical properties of LaNi3.8-xAlx （x=0.0, 0.1, 0.2, 0.3 and 0.4） alloys were studied sys- tematically. The microstructures were identified by X-ray diffraction （XRD） and scanning electronic microscopy （SEM）. The main phases were not changed with the substitution of Ni by A1, but minor phases appeared when x=0.4. With A1 content increasing, the cell volume increased and the hydrogen storage capacity increased first and then decreased, and the maximum discharge capacity increased fi：om 209.4 mAh/g （x=0.0） to 285.3 mAh/g （x=0.3） and then decreased to 241.3 mAh/g （x=0.4）. Meanwhile, the exchange current density （10） increased and the diffusion coefficient （D） decreased with the addition of Al.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60291-9