花球状二硫化钒的制备及其储锂研究

Synthesis of Flower-Like Vanadium Disulfide for Lithium Storage Application

采用一步水热法并添加表面活性剂聚乙二醇400制备出花球状二硫化钒,利用X射线粉末衍射仪、场发射扫描电子显微镜等方法对产物的物相和形貌进行了表征.观测生长过程发现花球状二硫化钒由若干六边形二硫化钒纳米片堆叠穿插组成,该花球状结构使材料拥有较高的比表面积及出色的结构稳定性.将花球状二硫化钒用于锂离子电池正极材料测试,结果表明花球状二硫化钒在电压区间为1～3 V,电流密度为200 m A·g^(-1)时具有出色的循环稳定性且循环50周之后容量可达450 m Ah·g^(-1).

In order to improve the electrochemical properties of vanadium disulfide(VS2) as an electrode material in Li-ion battery, the flower-like VS2 was prepared by a one-step hydrothermal method with the addition of polyethylene glycol 400. The phase and morphology of the product were characterized by using X-ray diffraction and field emission scanning electron microscopy. During the growth process, it was observed that the flower-like VS2 was interspersed with several hexagonal vanadium disulfide nanosheets, which had a high specific surface area and excellent structural stability. The flower-like VS2 was used for the cathode material test in lithium ion batteries. The results showed that the spheroidal VS2 had excellent cycle stability at a voltage range of 1~ 3 V and current density of 200 m A·g^-1, while after 50 cycles the discharge capacity was 450 m Ah·g^-1.