水热合成纳米片状SnS_2及其电化学贮放锂性能

Synthesis of SnS_2 nanosheets and their electrochemical performances used as anode materials of Li-ion battery

用四氯化锡(SnCl4)和L-半胱氨酸(L-Cys)的水热反应合成纳米片状的SnS2,用X-射线衍射(XRD)和透射电镜(TEM)对其微观结构和形貌进行表征.讨论了SnCl4与L-Cys物质的量比对产物及其形貌的影响.结果显示,当SnCl4与L-Cys的物质的量比为1∶2,得到的产物是SnS2和SnO2纳米粒子的混合物;当SnCl4与L-Cys的物质的量比为1∶4～1∶6,得到的产物是纳米片状的SnS2.电化学测试结果显示,纳米片状SnS2作为锂离子电池负极材料具有较高的可逆容量和良好的循环稳定性,其初始容量为480mAh/g,80次循环后其容量为407mAh/g.

SnS2 nanosheets were prepared by the hydrothermal reaction of mixture solution of SnCl4 and L-cysteine,and characterized by XRD and TEM.The influences on the products and their morphologies of the mol ratio of SnCl4 to L-cysteine were investigated.It was found that the mixture of SnS2 and SnO2 nanoparticles was obtained when the mol ratio of SnCl4 to L-cysteine was 1∶2,and SnS2 nanosheets were obtained when the mol ratio of SnCl4 to L-cysteine was 1∶4~1∶6.Electrochemical tests demonstrated that the SnS2 exhibited high reversible capacity and good cycling performances used as anode materials of Li-ion battery.Its reversible capacity was 480 and 407 mAh/g,respectively,at the first and 80th cycle.