Hydrothermal synthesis of nano-sized anatase TiO_2 powders for lithium secondary anode materials

摘要

Nano-sized TiO_2 powders were prepared by a hydrothermal synthetic method for use as anode materials in lithium secondary batteries. The prepared TiO_2 samples were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, transmission electron microscopy (TEM), and electrochemical tests. TiO_2 nanoparticles were obtained at sintering temperatures between 200 and 600℃. Calcination of the powders at 500℃ results in the formation of TiO_2 nano-sized particles of 22 nm in crystal size. These deliver a reversible discharge capacity of over 170 mAhg~(-1) between 1.5 and 3.0 V with excellent capacity retention over 95% after 100 cycles. It is speculated that the nano-sized TiO_2 powders are effective candidates for lithium secondary anode materials.