Nb‐Doped Rutile TiO 2 Mesocrystals with Enhanced Lithium Storage Properties for Lithium Ion Battery

A homogeneous Nb‐doped rutile TiO 2 mesocrystal material was synthesized successfully through a facile hydrothermal route. The incorporation of Nb 5+ not only promotes the crystallization of the building subunits of the rutile TiO 2 mesocrystal, but also improves the electrochemical performance at higher current rates. A capacity of 96.3 mAh g −1 at a current density as high as 40 C and an excellent long‐term cycling stability with a capacity loss of approximately 0.006 % per cycle at 5 C could be achieved when an appropriate amount of Nb 5+ was doped into rutile TiO 2 mesocrystal. The reasons for the improvement of rate capability may be attributed to the enhancement of electronic conductivity, Li‐ion diffusion kinetics, and the surface storage property for the Nb‐doped rutile TiO 2 mesocrystal.