title: Surface Coating Constraint Induced Anisotropic Swelling of Silicon in Si-Void@SiOxNanowire Anode for Lithium-Ion Batteries.
abstract: Here a simple and an environmentally friendly approach is developed for the fabrication of Si-void@SiOxnanowires of a high-capacity Li-ion anode material. The outer surface of the robust SiOxbackbone and the inside void structure in Si-void@SiOxnanowires appropriately suppress the volume expansion and lead to anisotropic swelling morphologies of Si nanowires during lithiation/delithiation, which is first demonstrated by the in situ lithiation process. Remarkably, the Si-void@SiOxnanowire electrode exhibits excellent overall lithium-storage performance, including high specific capacity, high rate property, and excellent cycling stability. A reversible capacity of 1981 mAh g-1is obtained in the fourth cycle, and the capacity is maintained at 2197 mAh g-1after 200 cycles at a current density of 0.5 C. The outstanding overall properties of the Si-void@SiOxnanowire composite make it a promising anode material of lithium-ion batteries for the power-intensive energy storage applications.
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.|Department of Physics, Donghua University, Shanghai, 201620, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Cui
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
authors.forename: Rujia
authors.initials: R
authors.lastname: Zou
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
authors.forename: Kaibing
authors.initials: K
authors.lastname: Xu
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
authors.forename: Junqing
authors.initials: J
authors.lastname: Hu
keywords: Si-void@SiOx nanowires; anisotropic swelling; anodes; cycling stability; surface coating constraint, lithium-ion batteries