title: General Strategy for Fabricating Sandwich-like Graphene-Based Hybrid Films for Highly Reversible Lithium Storage.
abstract: We report a general strategy for the fabrication of freestanding sandwich-like graphene-based hybrid films by electrostatic adsorption and following reduction reaction. We demonstrate that by rational control of pH value in precursors, graphene oxide (GO) sheets can form three-dimensional (3D) sandwich frameworks with nanoparticles decorated between the layers of graphene. In our proof-of-concept study, we prepared the graphene/Si/graphene (G@Si@G) sandwich-like films. When used as negative electrode materials for lithium-ion batteries, it exhibits superior lithium-ion storage performance (∼1800 mA h g(-1) after 40 cycles at 100 mA g(-1)). Importantly, with this simple and general method, we also successfully synthesized graphene/Fe2O3/graphene and graphene/TiO2/graphene hybrid films, showing improved electrochemical performance. The good electrochemical property results from the enhanced electron transport rate, and the 3D flexible matrix to buffer volume changes during cycling. In addition, the porous sandwich structure consisting of plate-like graphene with high surface area provides effective electrolyte infiltration and promotes diffusion rate of Li(+), leading to an improved rate capability.
authors.affiliation: Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China , No. 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China.
authors.forename: Xiongwu
authors.initials: X
authors.lastname: Zhong
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, The Institute of Physics, Chinese Academy of Sciences , Beijing 100190, P. R. China.
authors.forename: Zhenzhong
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China , No. 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China.
authors.forename: Xiaowu
authors.initials: X
authors.lastname: Liu
authors.affiliation: Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China , No. 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China.
authors.forename: Jiaqing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, The Institute of Physics, Chinese Academy of Sciences , Beijing 100190, P. R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China , No. 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China.|State Key Laboratory of Fire Science, University of Science and Technology of China , Hefei, Anhui 230026, P. R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yu
keywords: anode; freestanding; graphene; lithium-ion batteries; sandwich structure