锂离子电池负极材料TiS3 纳米片的制备和性能

先用直流(DC)电弧法制备TiH_1.924纳米粉作为前驱体，再用固-气相反应制备了片状结构的TiS₃纳米粉体。使用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、原子力显微镜(AFM)、拉曼光谱分析和性能测试等手段对其表征，研究了TiS₃纳米片的结构和将其用作负极的锂离子电池的性能。结果表明：TiS₃纳米片具有特殊的片状结构，其厚度约为35 nm。将TiS₃纳米片用作负极的锂离子电池具有良好的电化学性能，在500 mA/g电流密度下循环300圈后其容量仍保持在430 mAh/g。以5 A/g的大电流密度放电其比容量为240 mAh/g，电流密度恢复到100 mA/g其放电比容量稳定在500 mAh/g。TiS₃良好的倍率性能，源于其特殊的纳米片状结构。这种单层片状结构，能较好地适应电极材料在大电流密度多次放电/充电过程中产生的应变引起的体积变化，使其免于粉碎。

Preparation and Performance of TiS3 Nanoflakes as Anode Material for Lithium-ion Batteries

TiH_1.924 nanometer powder was prepared by DC arc method, and then taking TiH_1.924 as precursor,TiS₃ nanometer flakes with laminar structure was prepared by solid-gas reaction. The structure and performance of TiS₃ nanoflakes as anode material for lithium-ion batteries were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), Raman spectroscopy and performance testing. The performance of TiS₃ nanoflakes as anode for lithium-ion battery was also investigated. The results show that the TiS₃ nanoflake has a special nano-laminar structure, and its thickness is about 35 nm. The lithium-ion battery using TiS₃ nanoflakes as anode material has good electrochemical performance with the remained capacity of 430 mAh/g after 300 cycles at a current density of 500 mA/g. When the current density is 5 A/g the discharge capacity is 240 mAh/g and when the current density is restored to 100 mA/g, the discharge capacity is stable at 500 mAh/g. The good magnification properties of TiS₃ are due to its special nano-flake structure. The mono-laminar structure can better adapt to the volume change caused by the strain in the process of multiple discharge/charging at high current density, so as to prevent the electrode from crushing.