One-Pot Route for Uniform Anchoring of TiO2 Nanoparticles on Reduced Graphene Oxides: Enhanced Anode Performances for Lithium-Ion Batteries

摘要

Herein, a simple, one pot supercritical alcohol route was developed for synthesizing TiO2-reduced graphene oxide (RGO) composites. The unique ability for deoxygenation and nucleation/growth of metal oxide nanoparticles associated with supercritical isopropanol (scIPA) resulted in uniform anchoring of TiO2-nanoparticles on the surface of RGO sheets. During the one-pot synthesis, restacking of RGO sheets can be retarded by the tight anchoring of TiO2 nanoparticles on the basal plane. When tested as an anode for lithium ion batteries, the TiO2-RGO composite exhibited excellent electrochemical performance; reversible capacities of 404-430 mAh g-1 at 50 mA g-1 and a high-rate performance of 130 mAh g-1 at 5 A g-1 were obtained. Furthermore, the TiO2-RGO composite retained ca. 91% of 1st charge-discharge capacity after 1000 cycles at 1 A g-1.