Sn-Doped Rutile TiO2 Hollow Nanocrystalswith Enhanced Lithium-Ion Batteries Performance

摘要

Hollow structures and doping of rutile TiO2 are generally believed to be effective ways to enhance the performance of lithium-ion batteries. Herein, uniformly distributed Sn-doped rutile TiO2 hollow nanocrystals have been synthesized by a simple template-free hydrothermal method. A topotactic transformation mechanism of solid TiOF2 precursor is proposed to illustrate the formation of rutile TiO2 hollow nanocrystals. Then, the Sn-doped rutile TiO2 hollow nanocrystals are calcined and tested as anode in the lithium-ion battery. They deliver a highly reversible specific capacity of 251.3 mA h g^–1 at 0.1 A g^–1 and retain ∼110 mA h g^–1 after 500 cycles at a high current rate 5 A g^–1 (30 C), which is much higher than most of the reported work.