Ultrasmall TiO 2 nanoparticles embedded in nitrogen doped porous graphene for high rate and long life lithium ion batteries

摘要: Abstract Modifying TiO 2 with nitrogen and porous N doped graphene to form mesoporous /N nanostuctures has been successfully achieved by a two-step hydrothermal–calcining method urea as an inhibitor source. Porous network hinders the agglomeration of nanoparticles, enhances conductivity based electrode simultaneously, achieving enhanced capacity fast discharge charge rate. As anode material, such nanocomposite exhibits high 330.7 mAh g −1 at current rate 0.5 C reversible over 288.6 mAh g accompanying coulombic efficiency 96.4% 30 C after 1000 cycles. The superior electrochemical performance is ascribed excellent cycling stability, moreover, highly exciting from fundamental point view, good electronic caused incorporated sheets positive synergistic effect between ultrafined nanoparticles decorated matrix. Additionally, restriction ultrasmall reaction domains specific surface area structure allowing for almost diffusion less nucleation-free “conversion” results in efficient lithium ion batteries charge/discharge remarkably performance.