▎ 摘　　要

Two-dimensional MnO2/rGO nanocomposite has been synthesized by a facile wet chemical method at low temperature. Ultrathin layered MnO2 nanosheets were well-dispersed and tightly attached on the surface of reduced graphene oxide (rGO) sheets. Owing to a special laminar structure and higher electrical conductivity of rGO, the lithium ion diffusion and the electronic transport into the MnO2/rGO nanocomposites were increased, resulting in improved electrochemical performance as a cathode material in lithium-ion batteries. The first discharge-specific capacity of the layered MnO2 /rGO nanocomposites is 279.7mAh g(-1) and maintains at 242mAh g(-1) after 60 cycles at 0.1C. And the rate capability of MnO2/rGO nanocomposites is 236.9, 230.2, 190.3, 159.7 and 121.4mAh g(-1) at 0.1C, 0.2C, 0.5C, 1C and 2C, respectively. The excellent electrochemical performances highlight the two-dimensional layered MnO2/rGO nanocomposites as a potential cathode material of lithium-ion batteries.