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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Published inJournal of rare earths Vol. 31; no. 5; pp. 497 - 501
Main Author 王伟 陈云贵 李强 杨维才
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2013
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
hydrogen storage alloy
La5Ni19
electrochemical properties
rare earths
Online AccessGet full text
ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(12)60291-9

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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.
Bibliography:11-2788/TF
hydrogen storage alloy; La5Ni19; electrochemical properties; rare earths
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.
WANG Wei, CHEN Yungui, LI Qiang, YANG Weicai （1. China Academy of Engineering Physics, 621900, China; 2. College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60291-9