title: Helical silicon/silicon oxide core-shell anodes grown onto the surface of bulk silicon.
abstract: We demonstrate a simple route for preparing Si/SiO(x) urchin-like structures in which Si/SiO(x) core-shell nanocoils protruded out from the surface of bulk Si, via high-temperature annealing of Pt-decorated Si powders. The carbon-coated urchin-like anodes with micro- and nanostructured composite exhibit a significantly improved electrochemical performance with a high specific capacity of 1600 mAh/g and a superior cycling performance of 70 cycles at a rate of 0.2 C due to the nanocoil conformation and SiO(x) buffer layer. More importantly, the composite results in a significantly enhanced the volumetric capacity with ∼3780 mAh/cc, compared to bulk Si (∼2720 mAh/cc) after fully lithiation to 0 V.
authors.affiliation: Interdisciplinary School of Green Energy, Converging Research Center for Innovative Battery Technologies,  Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Korea.
authors.forename: Hana
authors.initials: H
authors.lastname: Yoo
authors.forename: Jung-In
authors.initials: JI
authors.lastname: Lee
authors.forename: Hyunjung
authors.initials: H
authors.lastname: Kim
authors.forename: Jung-Pil
authors.initials: JP
authors.lastname: Lee
authors.forename: Jaephil
authors.initials: J
authors.lastname: Cho
authors.forename: Soojin
authors.initials: S
authors.lastname: Park