Nanocomposite of TiO_2 Nanoparticles-Reduced Graphene Oxide with High-Rate Performance for Li-Ion Battery

摘要

A simple and effective method is developed to synthesize the nanocomposites of anatase TiO_2 nanoparticles deposited on the reduced graphene oxide (TiO_2-RGO) sheets as anode materials for Li-ion battery applications. Structure analyses demonstrated that anatase TiO_2 nanoparticles were well dispersed onto the reduced graphene oxide nanosheets with chemical bonds. These TiO_2-RGO nanocomposites were electrochemically investigated in the coin-type cells versus metallic lithium, and the lithium storage performance of these nanocomposites showed the enhanced high-rate capabilities and good cycling stability. These improved electrochemical performance can be attributed mainly to efficient dispersion of TiO_2 nanocrystals on the surface of conductive RGO sheets, which makes these TiO_2-RGO nanocomposites practical for high-rate Li-ion battery applications.