title: Scalable synthesis of silicon nanosheets from sand as an anode for Li-ion batteries.
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.
authors.affiliation: Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Republic of Korea. shhong@snu.ac.kr.
authors.forename: Won-Sik
authors.initials: WS
authors.lastname: Kim
authors.forename: Yoon
authors.initials: Y
authors.lastname: Hwa
authors.forename: Jung-Hoo
authors.initials: JH
authors.lastname: Shin
authors.forename: Myung
authors.initials: M
authors.lastname: Yang
authors.forename: Hun-Joon
authors.initials: HJ
authors.lastname: Sohn
authors.forename: Seong-Hyeon
authors.initials: SH
authors.lastname: Hong