Inexpensive synthesis of anatase TiO_2 nanowires by a novel method and its electrochemical characterization

摘要

We demonstrate a simple, rapid, inexpensive and novel approach for the synthesis of a kind of anatase TiO_2 nanowires. The method is based on a hydrothermal method under normal atmosphere without using the complex Teflon-lined autoclave, high concentrations NaOH solution and long reaction time. The as-prepared materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical measurements. The obtained anatase TiO_2 nanowires show excellent performance. The initial Li insertion/extraction capacity is 260 and 224 mA h g~(-1)at 20 mA g~(-1), respectively. In the 20th cycle, the reversible capacity still remains about 216mAhg~(-1),exhibiting excellent cycling stability. The discharging capacity is about 159 mA g~(-1) in the 20th cycle at 200 mA g~(-1),demonstrating a good high-rate performance. Anatase TiO_2 nanowires might be a promising anode material for lithium-ion batteries.