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    3D amorphous carbon and graphene co-modified LiFePO4 composite derived from polyol process as electrode for high power lithium-ion batteries

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    Fulltext not available
    Authors
    Wu, G.
    Ran, R.
    Zhao, B.
    Sha, Y.
    Su, Chao
    Zhou, Y.
    Shao, Zongping
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Wu, G. and Ran, R. and Zhao, B. and Sha, Y. and Su, C. and Zhou, Y. and Shao, Z. 2014. 3D amorphous carbon and graphene co-modified LiFePO4 composite derived from polyol process as electrode for high power lithium-ion batteries. Journal of Energy Chemistry. 23 (3): pp. 363-375.
    Source Title
    Journal of Energy Chemistry
    DOI
    10.1016/S2095-4956(14)60159-5
    ISSN
    2095-4956
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/40721
    Collection
    • Curtin Research Publications
    Abstract

    Amorphous carbon and graphene co-modified LiFePO4 nanocomposite has been synthesized via a facile polyol process in connection with a following thermal treatment. Various characterization techniques, including XRD, Mössbauer spectra, Raman spectra, SEM, TEM, BET, O2-TPO, galvano charge-discharge, CV and EIS were applied to investigate the phase composition, carbon content, morphological structure and electrochemical performance of the synthesized samples. The effect of introducing way of carbon sources on the properties and performance of LiFePO4/C/graphene composite was paid special attention. Under optimized synthetic conditions, highly crystalized olivine-type LiFePO4 was successfully obtained with electron conductive Fe2P and FeP as the main impurity phases. SEM and TEM analyses demonstrated the graphene sheets were randomly distributed inside the sample to create an open structured LiFePO4 with respect to graphene, while the glucose-derived carbon mainly coated over LiFePO4 particles which effectively connected the graphene sheets and LiFePO4 particles to result in a more efficient charge transfer process. As a result, favorable electrochemical performance was achieved. The performance of the amorphous carbon-graphene co-modified LiFePO4 was further progressively improved upon cycling in the first 200 cycles to reach a reversible specific capacity as high as 97 mAh·g−1 at 10 C rate.

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