Electrochemically exfoliated graphene as a novel microwave susceptor: The ultrafast microwave-assisted synthesis of carbon-coated silicon-graphene film as a lithium-ion battery anode

Jong Min Kim, Dongjin Ko, Jiseop Oh, Jeongyeon Lee, Taejin Hwang, Youngmoo Jeon, Wytse Hooch Antink, Yuanzhe Piao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

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 a carbon-coated silicon-graphene nanocomposite using a commercial microwave system. Electrochemically exfoliated graphene is used as a novel microwave susceptor to deliver 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 nanoparticle-electrochemically exfoliated graphene nanocomposite film was prepared by a 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. The 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 mA h g-1 at a current density of 0.1 A g-1 and 662 mA h 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.

Original languageEnglish
Pages (from-to)15582-15590
Number of pages9
JournalNanoscale
Volume9
Issue number40
DOIs
Publication statusPublished - 28 Oct 2017

ASJC Scopus subject areas

  • Materials Science(all)

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