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题名: Electrochemical performances of cobalt-free La0.7Mg0.3Ni3.5-x(MnAl2)(x) (x=0-0.20) hydrogen storage alloy electrodes
作者: Chu, Hailiang1, 2;  Zhang, Yao1;  Qiu, Shujun1, 2;  Qi, Yanni1, 2;  Sun, Lixian1;  Xu, Fen1;  Wang, Qing3;  Dong, Chuang3
关键词: electrode materials ;  hydrogen storage alloys ;  electrochemical properties ;  partial substitution
刊名: JOURNAL OF ALLOYS AND COMPOUNDS
发表日期: 2008-06-12
DOI: 10.1016/j.jallcom.2007.03.046
卷: 457, 期:1-2, 页:90-96
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary ;  Metallurgy & Metallurgical Engineering
研究领域[WOS]: Chemistry ;  Materials Science ;  Metallurgy & Metallurgical Engineering
英文摘要: Cobalt-free AB(3)-type La0.7Mg0.3Ni3.5-x(MnAl2), (x=0-0.20) nonstoichiometric alloys were synthesized and investigated for their electrochemical hydrogen storage properties. It was found that the maximum discharge capacity of La0.7Mg0.3Ni3.5-x(MnAl2) (x = 0-0.20) alloy electrodes decreases from 362.7 mAh/g (x = 0) to 293.9 mAh/g (x = 0.20) with increasing x. The cyclic capacity retention rate C-100/C-max of alloy electrodes initially increases to 43.7% (x = 0.10) due to the formation of M-containing passive film, and subsequently decreases to 35.9% (x = 0.20) since the passive film is cracked. These phenomena are demonstrated by scanning electron microscopy (SEM) images of alloy electrodes after 70 charge-discharge cycles. It was also revealed that the electrochemical reaction kinetics is retarded when x<0.10, which can be ascribed to the increase of charge-transfer resistance of the alloy electrodes due to the formation of Al-containing passive film. When x > 0.10, the electrochemical kinetics is enhanced because of the crack of the Al oxide film on the electrode surface resulting from the dissolution of Mn into the alkaline electrolyte. The optimal content of Mn and Al in La0.7Mg0.3Ni3.5-x(MnAl2)(x) alloys for negative electrodes in alkaline rechargeable secondary batteries is x = 0.10 in this study. (C) 2007 Elsevier B.V. All rights reserved.
关键词[WOS]: METAL HYDRIDE ELECTRODES ;  CO CONTENT ;  CAPACITY ;  SUBSTITUTION ;  LAMG2NI9 ;  BATTERY ;  NI ;  X=0.1-0.5 ;  BEHAVIOR ;  PHASE
语种: 英语
WOS记录号: WOS:000256124900022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141118
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Mat & Thermochem Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.Dalian Univ Technol, State Key Lab Mat Modificat, Dalian 116024, Peoples R China

Recommended Citation:
Chu, Hailiang,Zhang, Yao,Qiu, Shujun,et al. Electrochemical performances of cobalt-free La0.7Mg0.3Ni3.5-x(MnAl2)(x) (x=0-0.20) hydrogen storage alloy electrodes[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2008,457(1-2):90-96.
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