Preparation method of sno2@sn coated reduced graphene oxide composite material

Abstract

A preparation method of SnO@Sn coated reduced graphene oxide composite material. By compounding reduced graphene oxide and SnO, SnOundergoes conversion and alloying reactions to form Sn nanoparticles, and the three components have a synergistic effect and good reversibility. Nano SnO@Sn particles are uniformly distributed on the ultrathin RGO nanosheets. RGO can effectively alleviate volume expansion caused by SnOand prevent SnO@Sn nanoparticles from agglomeration during cycle. The adhesion of SnO@Sn on RGO can also effectively reduce the repacking of RGO nanosheets, so that the composite material maintains a large surface area during the charge-discharge process, providing sufficient space for the storage of potassium ions. Therefore, the prepared SnO@Sn coated reduced graphene oxide composite material (SnO@Sn@RGO) has excellent electrochemical performance, exhibits excellent cycle performance, rate capability and long-term cycle stability, and has a very ideal first coulomb efficient.