Scalable synthesis of silicon nanosheets from sand as an anode for Li-ion batteries

Won Sik Kim, Yoon Hwa, Jung Hoo Shin, Myung Yang, Hun Joon Sohn, Seong Hyeon Hong

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

Abstract

The silicon nanostructure is a promising candidate for an anode of Li-ion batteries due to its high theoretical capacity. In this work, we have demonstrated the scalable synthesis of Si nanosheets from natural sand by magnesiothermic reduction, and suggested a new formation mechanism for Si nanosheets. In the suggested mechanism, an Mg2Si intermediate phase was formed at an early stage of the reduction process, which leads to the two-dimensional Si nanostructure. The synthesized Si nanosheets have a leaf-like sheet morphology ranging from several ten to several hundred nanometers, and show comparable electrochemical properties to the commercial Si nanopowder as an anode for lithium ion batteries. For the improved electrochemical performance, Si nanosheets are encapsulated with reduced graphene oxide (RGO), and the RGO-encapsulated Si nanosheet electrode exhibits high-reversible capacity and excellent rate capability.

Original languageEnglish (US)
Pages (from-to)4297-4302
Number of pages6
JournalNanoscale
Volume6
Issue number8
DOIs
StatePublished - Apr 21 2014
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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