Abstract
A novel hybrid nanoarchitecture of TiO2 nanotubes/graphene was synthetized through a facile two-step hydrothermal route. The anatase TiO2 nanotubes with a diameter of about 20nm show a net-like structure and high dispersion on the graphene nanosheets. The as-prepared sample (TOG2) exhibits a high average capacity of 410mAhg−1 at 0.1Ag−1, superior cycling stability with negligible capacity fade over 300 cycles and rate capability of 192mAhg−1 at 1Ag−1. The enhanced electrochemical properties can be attributed to its unique hybrid structure. One-dimensional hollow tubular structure of TiO2 provides numerous open channels for electrolyte to access and facilitate the ultrafast diffusion of lithium ions. In addition, the graphene sheets are favorable for the fast electron transport within the electrode, as well as keep the structural integrity during long-term cycling processes.
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