A unique sandwich-structured C/Ge/graphene nanocomposite as an anode material for high power lithium ion batteries

A unique sandwich-structured C/Ge/graphene composite with germanium nanoparticles trapped between graphene sheets is prepared by a microwave-assisted solvothermal reaction followed by carbon coating and thermal reduction. The graphene sheets are found to be effective in hindering the growth and aggr...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2013-01, Vol.1 (45), p.14115-14121
Main Authors: Li, Dan, Seng, Kuok Hau, Shi, Dongqi, Chen, Zhixin, Liu, Hua Kun, Guo, Zaiping
Format: Article
Language:English
Subjects:
Carbon
Coating
Electrode materials
Germanium
Germanium oxides
Graphene
Lithium-ion batteries
Nanoparticles
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Summary:A unique sandwich-structured C/Ge/graphene composite with germanium nanoparticles trapped between graphene sheets is prepared by a microwave-assisted solvothermal reaction followed by carbon coating and thermal reduction. The graphene sheets are found to be effective in hindering the growth and aggregation of GeO sub(2) nanoparticles. More importantly, the graphene sheets, coupled with the carbon coating, can buffer the volume changes of germanium in electrochemical lithium reactions. The unique sandwich structure features a highly conductive network of carbon, which can improve both the conductivity and the structural stability of the electrode material, and exemplifies a promising strategy for the development of new high performance electrode materials for lithium ion batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/c3ta13324a