In-situ constructing of hollow TiO2@rGO hybrid spheres as high-rate and long-life anode materials for lithium-ion batteries

Abstract

Abstract The hollow TiO2@rGO hybrid spheres are in-situ synthesized by using TiO2 spheres as a precursor and a simple hydrothermal route with subsequent annealing. The unique hollow structure has large special surface areas, and the reduced graphene oxide (rGO) layer can accelerate transfer of lithium ions and electrons and efficiently enhance the structural stability. The prepared hollow TiO2@rGO hybrid spheres exhibit better electrochemical performance than pure TiO2 hollow microspheres. It exhibits a high special capacity of 254.3 mA h g−1 at 1C after 600 cycles and highly stable capacity retention, and superior rate capacity of 159.1 mAh g−1 at 10C after 3000 cycles. Moreover, the hollow TiO2@rGO hybrid spheres have high surface area, superior structural stability, and excellent high-rate and long-life cycle property as anode material for LIBs.