A self-assembled 3D urchin-like Ti0.8Sn0.2O2–rGO hybrid nanostructure as an anode material for high-rate and long cycle life Li-ion batteries

Abstract

The controllable synthesis of electrode materials with unique nanostructures, high specific surface areas, and excellent electrochemical performance is crucially demanded for lithium-ion power batteries. In this paper, a 3D urchin-like Ti_0.8Sn_0.2O₂–rGO hybrid nanostructure was successfully fabricated by a one-step hydrothermal process based on the coordination principle and molecular self-assembly theory. This novel graphene-supported Ti_0.8Sn_0.2O₂ solid solution material efficiently combined the mechanical stability of TiO₂ and high capacity of SnO₂, leading to excellent electrochemical activity and superior cycling stability. High specific capacities of about 430 mA h g⁻¹ at a current density of 0.5 A g⁻¹ and 400 mA h g⁻¹ after 500 cycles at 1 A g⁻¹ with an efficiency of nearly 100% were achieved. This strategy could be applied to develop novel structures as electrode materials with facile synthesis, low cost, and high performance.