蠕虫状MoS2/C的制备及其在锂离子电池负极材料中的应用

Preparation of Worm-like MoS2/C and Its Application in Anode Materials of Li-ion Battery

以二水合钼酸钠(Na2MoO4·2H2O)、四水合钼酸铵((NH4)6Mo7O24·4H2O)作为钼源,硫脲(NH2CSNH2)为硫源,葡萄糖为碳源,采用水热法制备了二硫化钼(MoS2)/C复合材料。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)等分析方法对MoS2/C复合材料的结构和形貌进行了表征,并对其电化学性能进行测试。结果表明:水热法合成的两种复合材料均为纳米片无序堆叠而成的蠕虫状结构,其中钼酸钠为钼源时呈微球状。将其用作负极材料时,钼酸钠作钼源性能更佳,其在电流密度为200 m A/g的情况下首次放电比容量为766 m Ah/g,库伦效率为78.3%,循环100次后容量保持在524 m Ah/g左右,其倍率性能优异。

A facile hydrothermal method has been developed to synthesize the MoS2/C composite,which used sodium molybdate,ammonium molybdate,thiourea and glucose as starting materials.The structure and morphology of composite were characterized by X-ray diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscope(TEM)and X-ray photoelectron spectra(XPS),and electrochemical performances were evaluated in coin-type cells.The result indicates that two of the composite materials synthesized by the hydrothermal method are both worm-like structures formed by disorderly stacking of nanosheets,and it is microspheres when the molybdenum source is sodium molybdate.When it is used as an anode material for Li-ion battery,the sodium molybdate is better and delivers an initial capacity of 766 m Ah/g and the coulombic efficiency is 78.3%at the current density of 200 m A/g.And its discharge capacity stayes around of 524 m Ah/g after 100 cycles,moreover its rate performance is also excellent.