同轴ITO-TiO_(2)纳米管复合材料的储锂性能研究

Lithium Storage Properties of Coaxial ITO-TiO_(2) Nanotube Composites

TiO_(2)负极因其在锂离子电池充放电过程中具有良好的结构稳定性和安全性而受到广泛的关注。然而,TiO_(2)固有的导电性差限制了其在高电流密度下的容量及循环稳定性。本研究采用真空机械压注法和随后的退火处理成功制备了同轴氧化铟锡-TiO_(2)纳米管复合物(ITO-TiO_(2)NTs)。作为锂离子电池的负极材料,在0.2 A·g^(-1)的电流密度下,ITO-TiO_(2)NTs在350次循环后表现出295.9 mAh·g^(-1)的高容量。ITO在三维结构中充当导电电芯的角色,提高整体的导电性,促进电子和锂离子快速传输,从而提高复合材料循环稳定性和倍率性能。所提出的真空机械压注法对TiO_(2)纳米管阵列薄膜材料的复合改性提供了简单、高效的方法,具有重要意义。

TiO_(2) anode has received wide attention because of its good structural stability and safety during the charging and discharging of lithium-ion battery.However,the inherent poor conductivity of TiO_(2) limits its capacity and cycling stability at high current densities.In this paper,coaxial indium tin oxide-TiO_(2) nanotube complexes(ITO-TiO_(2)NTs)were prepared by vacuum mechanical press injection method and subsequent annealing treatment.As an anode material for Li-ion batteries,ITO-TiO_(2)NTs exhibit a high capacity of 295.9 mAh·g^(-1) after 350 cycles with the current density of 0.2 A·g^(-1).The ITO acts as a conductive core in the three-dimensional structure,which improves the overall conductivity and which facilitates the fast electron and Li-ion transfer,thus improving the cycling stability and multiplicity performance of the composite.The vacuum mechanical press injection method is simple and efficient for composite modification of TiO_(2) nanotube array thin film materials.