▎ 摘　　要

Metal oxides such as SnO2 are widely studied as anode materials for next-generation lithium-ion batteries because of their high theoretical capacities. However, the lithium storage capability of SnO2 is suppressed by its poor electrical conductivity and serious volume change during the charge and discharge processes. In this work, SnO2 nanoparticles are directly grown on the surface of electrochemically exfoliated graphene, followed by doping Sb into SnO2 nanoparticles. As a high quality of graphene, electrochemically exfoliated graphene possesses high electrical conductivity and strong mechanical strength, which is beneficial to the charge transfer from graphene to SnO2 nanoparticles. Moreover, the doping of Sb into SnO2 nanoparticles inhibits the agglomeration and growth of SnO2 nanoparticles, and further improves the electron conductivity of SnO2 by changing the electronic structure of SnO2. As a result, electrochemically exfoliated graphene-based SnO2 with Sb doping exhibits superior electrochemical performance including high reversible capacity, excellent cycling stability and remarkable rate capability. Modifying the electronic structure of metal oxides by doping with appropriate metals may provide an avenue to realize the demand of high-performance electrodes for secondary batteries. (C) 2019 Elsevier B.V. All rights reserved.