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Electrochemically Exfoliated Graphene as a Novel Microwave Susceptor: the Ultrafast Microwave-assisted Synthesis of Carbon-coated Silicon-graphene Film as Lithium-ion Battery Anode

Abstract

Graphene nanocomposites have attracted much attention in many applications due to their superior properties. However, preparing graphene nanocomposites requires a time-consuming thermal treatment to reduce the graphene or synthesize nanomaterials in most cases. We present an ultrafast synthesis of carbon-coated silicon-graphene nanocomposite using a commercial microwave. Electrochemically exfoliated graphene is used as a novel microwave susceptor to deliver the efficient microwave energy conversion. Unlike graphene oxide, it does not require a time-consuming pre-thermal reduction or toxic chemical reduction to absorb microwave radiation efficiently. A carbon-coated silicon nanoparticles-electrochemically exfoliated graphene nanocomposite film was prepared by few seconds microwave irradiation. The Sp2 domains of graphene absorb microwave radiation and generate heat to simultaneously reduce the graphene and carbonize the polydopamine carbon precursor. The as-prepared N-doped carbon-coated silicon-graphene film was used as a lithium-ion battery anode. N-doped carbon coating decreases the contact resistance between silicon nanoparticles and graphene provides a wide range conductive network. Consequently, it exhibited a reversible capacity of 1744 mAh g-1 at a current density of 0.1 A g-1 and 662 mAh g-1 at 1.0 A g-1 after 200 cycles. This method can potentially be a general approach to prepare various graphene nanocomposites in an extremely short time.

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Publication details

The article was received on 28 Jun 2017, accepted on 15 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR04657J
Citation: Nanoscale, 2017, Accepted Manuscript
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    Electrochemically Exfoliated Graphene as a Novel Microwave Susceptor: the Ultrafast Microwave-assisted Synthesis of Carbon-coated Silicon-graphene Film as Lithium-ion Battery Anode

    J. M. Kim, D. Ko, J. Oh, J. Lee, T. Hwang, Y. Jeon, W. Hooch Antink and Y. Piao, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04657J

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