Mg2Si anode for Li-ion batteries: Linking structural change to fast capacity fading

This work reports on the underlying mechanism of the fast capacity fading of Mg2Si. The linking of the structural change and degradation behavior that occurs during cycling shows that the dissociation and irreversible lithiation of Mg is the critical factor for the capacity fading of a Mg2Si anode....

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (21)
Main Authors: Ma, Ruijun, Liu, Yongfeng, Yang, Yaxiong, Gao, Mingxia, Pan, Hongge
Format: Article
Language:English
Subjects:
Anodes
Applied physics
Cycles
Electrode materials
Fading
Intermetallic compounds
Lithium-ion batteries
Magnesium compounds
Metal silicides
Rechargeable batteries
Stability
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Summary:This work reports on the underlying mechanism of the fast capacity fading of Mg2Si. The linking of the structural change and degradation behavior that occurs during cycling shows that the dissociation and irreversible lithiation of Mg is the critical factor for the capacity fading of a Mg2Si anode. This mechanism was further proven by designing a ternary Li2MgSi that exhibited significantly improved cycling stability because of the elimination of the intermediate Mg upon charging/discharging. This finding is useful as a general guideline and inspiration for improving the cycling stability of Mg2Si anodes and designing anode materials with long-term cyclability.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4902510