Effect of heat treatment on the morphology and electrochemical performance of TiO_2 nanotubes as anode materials for lithium-ion batteries

摘要

Lepidocrocite TiO_2 nanotubes prepared by hydrothermal process were annealed at 300 ℃ and 500 ℃ for 1 h in air. The morphologies, structures and electrochemical performances of these TiO_2 nanomaterials were investigated by transmission electron microscope. X-ray diffraction and a variety of electrochemical testing techniques. The results showed that the TiO_2 nanotubes gradually collapsed during heating period, and were finally transformed into anatase TiO_2 nanorods. The electrochemical measurements revealed that all the TiO_2 electrodes exhibit a good cycling performance when were used as the anode materials for lithium-ion batteries. Compared with the original TiO_2 nanotubes, the 500 ℃ annealed TiO_2 nanomaterial electrode provided a higher first coulombic efficiency and higher lithium-ion transfer rate, implying a promising anode candidate for lithium-ion batteries.