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Nanosilicon-Coated Graphene Granules as Anodes for Li-Ion Batteries

Authors

  • Kara Evanoff,

    1. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332–0245, USA
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  • Alexandre Magasinski,

    1. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332–0245, USA
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  • Junbing Yang,

    1. Chemical Sciences & Engineering Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
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  • Gleb Yushin

    Corresponding author
    1. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332–0245, USA
    • School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332–0245, USA.
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Abstract

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Uniform deposition of Si and C layers on high surface area graphene produces granules with specific surface area of ∼5 m2·g−1. The anode composed of the nanocomposite particles exhibited specific capacity in excess of 2000 mAh·g−1 at a current density of 140 mA·g−1 and excellent stability for 150 cycles. The low surface area of the composite resulted in an average Coulombic efficiency in excess of 99%.

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