二硫化钼/碳中空微球的制备及其电化学性能

Preparation and Electrochemical Properties of MoS_2/C Hollow Microspheres

采用溶胶–凝胶法制备粒径均一的SiO_2微球,并以其作为牺牲模板,通过十六烷基三甲基溴化铵(CTAB)的连接作用在SiO_2微球表面生长MoS_2和碳(C),借助碱液刻蚀去除二氧化硅微球模板制备了二硫化钼/碳中空微球材料,对产物进行了表征,并将产物制备成电极材料进行恒流充放电、倍率性能、循环伏安、交流阻抗测试。结果表明:所制备的MoS_2/C中空微球尺寸为200~300 nm,其表面包裹着花瓣状的MoS_2片层和无定形态的碳;作为锂电池负极材料,在100 m A/g电流密度下,首次充放电容量超过1 400 m A·h/g,60次循环后,电容量仍可以保持在460 m A·h/g左右。

MoS2 and carbon （C） were firstly formed on the surface of SiO2 nanoparticles prepared by sol-gel method as sacrificial template with hexadecyltrimethylammonium bromide （CTAB）, and then molybdenum disulfide/carbon hollow microspheres were prepared by alkali liquor etching silica microsphere matrix microspheres. The products were characterized, and the electrochemical properties of the products as electrode materials were investigated by constant current charging and discharging, magnification performance, cyclic voltammetry and AC impedance testing. The results show that the size of as-prepared MoS2/C hollow microspheres is approxinmately 200-300 nm, and its surface is wrapped with petaloid MoS2 lamellae and amorphous carbon. As a lithium battery anode material, the resultant product shows the first charge and discharge capacity of more than 1 400 mA.h/g at a current density of 100 mA/g, and the capacity can still maintain 460 mA.h/g after 60 cycles.