title: Critical thickness of SiO2 coating layer on core@shell bulk@nanowire Si anode materials for Li-ion batteries.
abstract: Amorphous SiO2 coating layers with thicknesses of ca. 2, 7, 10, and 15 nm are introduced into bulk@nanowire core@shell Si particles via direct thermal oxidation at 650-850 °C. Of the coated samples, Si with a coating thickness of ca. 7 nm has the best electrochemical performance. This sample shows an initial discharge capacity of 2279 mA h g(-1) with a Coulombic efficiency of 92% and displays 83% capacity retention after 50 cycles at 0.2C rate.
authors.affiliation: Interdisciplinary School of Green Energy, Ulsan National Institute of Science & Technology, Ulsan, S. Korea.
authors.forename: Soojin
authors.initials: S
authors.lastname: Sim
authors.forename: Pilgun
authors.initials: P
authors.lastname: Oh
authors.forename: Soojin
authors.initials: S
authors.lastname: Park
authors.forename: Jaephil
authors.initials: J
authors.lastname: Cho
keywords: lithium-ion batteries; rate capabilities; silica coating layers; silicon anodes; volume changes