Synthesis of SnS2/reduced graphene oxide and its application in lithium ion batteries
SnS2/reduced graphene oxide(SnS2/RGO)composites were prepared by hydrothermal method.The phase,chemical groups,elemental composition,specific surface area and pore size of SnS2/RGO composites were characterized by X-ray diffraction spectroscopy(XRD),Raman spectroscopy(Raman),X-ray photoelectron spectroscopy(XPS)and N2 adsorption-desorption.SnS2/RGO composites were used as anode materials for lithium ion batteries to assemble button batteries.The results show that the charge-discharge specific capacity of SnS2/RGO composite is significantly higher than that of pure SnS2 at a current density of 100 mA/g.The first discharge specific capacity of SnS2/RGO composite is as high as 2 803 mAh/g,showing excellent electrochemical performance.After 100 cycles,the discharge specific capacity can still reach 941 mAh/g,while the discharge specific capacity of pure SnS2 is much lower than that of SnS2/RGO composite after 100 cycles,only 198 mAh/g,showing good cycle stability.At a high current density of 1 000 mA/g,the discharge specific capacity of SnS2/RGO composite can still reach 696 mAh/g,showing good rate performance.
SnS2reduction of graphene oxidelithium ion batteryelectrochemical performancebattery anode material