▎ 摘　　要

NOVELTY - An iron sulfide/graphene nano-composite preparing method involves dispersing oxidized graphite in water by ultrasonically to obtain oxidized graphene solution, added sulfuric acid, and ultrasonically dispersing uniformly. The mixed solution is transferred into a reaction kettle, removed, and washed, followed by dissolving, immersing the three-dimensional columnar reduced graphene oxide in the mixed solution, and transferring mixed solution and the three-dimensional columnar reduced graphene oxide into hydrothermal reaction kettle. The product is washed and dried to obtain finished product. USE - Method for preparing iron sulfide/graphene nano-composite for use in preparing that is utilized in lithium ion battery (claimed). ADVANTAGE - The method enables preparing the iron sulfide/graphene nano-composite with better circulation stability and high specific energy density. DETAILED DESCRIPTION - An iron sulfide/graphene nano-composite preparing method involves dispersing oxidized graphite in water by ultrasonically to obtain oxidized graphene solution, added sulfuric acid, and ultrasonically dispersing uniformly to obtain mixed solution. The mixed solution is transferred into a reaction kettle at 160-260 degrees C for 18-30 hours, removed, and washed to obtain three-dimensional columnar reduced graphene oxide. The reaction conditions are preferably at 190-220 degrees C for 20-24 hours, followed by dissolving ferrous salt, sulfur source in organic solvents to obtain mixed solution. The three-dimensional columnar reduced graphene oxide is immersed in the mixed solution at 3-50 degrees C for 1 day, preferably at 10-30 degrees C for 1-2 days. The mixed solution and the three-dimensional columnar reduced graphene oxide are transferred into a hydrothermal reaction kettle and reacted at 160-240 degrees C for 18-36 hours, preferably at 180- 200 degrees C for 24 hours to obtain resultant product. The resultant product is washed and dried to obtain finished product.