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    Micro-/nano-structured hybrid of exfoliated graphite and Co3O4 nanoparticles as high-performance anode material for Li-ion batteries

    Access Status
    Fulltext not available
    Authors
    Zhao, Y.
    Li, Y.
    Ma, C.
    Shao, Zongping
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhao, Y. and Li, Y. and Ma, C. and Shao, Z. 2016. Micro-/nano-structured hybrid of exfoliated graphite and Co3O4 nanoparticles as high-performance anode material for Li-ion batteries. Electrochimica Acta. 213: pp. 98-106.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2016.07.102
    ISSN
    0013-4686
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/30766
    Collection
    • Curtin Research Publications
    Abstract

    A novel Co3O4 nanoparticles (NPs)/exfoliated graphite (EG) composite has been prepared through a stirring-assistant hydrothermal route and a subsequent post-anneal treatment. Results of microstructure characterizations of XRD, FE-SEM and HR-TEM analyses indicate that high-crystallized Co3O4-NPs with a dimension of ~5 nm are homogenously anchored on the nanosheets of EG in the form of tiny agglomerates of ~20 nm. Restack and shrinkage of the edge regions of EG are distinctly observed after suffering from the hydrothermal process, which exerts a positive influence over the decay-free cycling ability of the Co3O4-NPs/EG electrode. The reversible capacity increases with cycling, and reaches 1183 mAhg-1 (94th cycle) at 100 mAg-1 and 739 mAhg-1 (100th cycle) at 1000 mAg-1. After suffering from 800 cycles at 2000 mAg-1 and resetting to 100 mAg-1, the charge capacity recovers to as high as 1225 mAhg-1 immediately, and stabilizes in the following cycles. The decay-free cycling performances and good rate capability are ascribed to the favorable synergistic effect between Co3O4-NPs and the robust/conductive skeleton of EG. In addition, an exceeded capacity which much surpasses the calculated theoretical value is achieved, further proving the good synergistic enhancement due to the high-effective integration between Co3O4-NPs and EG.

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