title: Anchoring Nitrogen-Doped TiO2Nanocrystals on Nitrogen-Doped 3D Graphene Frameworks for Enhanced Lithium Storage.
abstract: An advanced architecture design of nitrogen-doped TiO2anchored on nitrogen-doped 3D graphene framework composites (denoted as N-TiO2/N-3D GFs) have been fabricated by a facile template process and further NH3treatment. The 3D graphene framework allows the electrolyte to penetrate into the inverse opal structure, and possesses high electronic conductivity. The close contact between the N-TiO2and the graphene suppresses the growth and aggregation of TiO2nanoparticles during heating process, leading to decreased Li+diffusion length. The N-doping in both TiO2and the graphene matrix could improve the electronic conductivity on the TiO2particle surface and between adjacent particles. As expected, when used as an anode for Li-ion batteries (LIBs), the N-TiO2/N-3D GFs composite delivers an excellent reversible capacity of 165 mA h g-1after 200 cycles at 100 mA g-1and an outstanding rate capability of 114 mA h g-1after 1000 cycles at 1 Ag-1. With rational design, this strategy could be extended to other electrode materials that may hold great promise for the development of high energy storage systems.
authors.affiliation: CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.
authors.forename: Xiao-Wu
authors.initials: XW
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, The Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
authors.forename: Zhen-Zhong
authors.initials: ZZ
authors.lastname: Yang
authors.affiliation: CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.
authors.forename: Fu-Sen
authors.initials: FS
authors.lastname: Pan
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, The Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China.|Collaborative Innovation Center of Quantum Matter, Beijing, 100190, P.R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China.|Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education, Nankai University, Tianjin, 300071, 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.identifier: http://orcid.org/0000-0002-3685-7773
authors.initials: Y
authors.lastname: Yu
keywords: 3D graphene frameworks; Li-ion batteries; anode; nitrogen-doped TiO2; nitrogen-doped graphene