▎ 摘　　要

NOVELTY - A porous graphene-supported carbon-coated iron oxide nanoparticle composite material is prepared by preparing graphene oxide solution using graphite ore powder, potassium permanganate and concentrated sulfuric acid, configuring an iron salt solution by dissolving cetyltrimethylammonium bromide in water, adding iron salt, stirring and adding ammonia solution, stirring the graphene oxide solution and the aqueous iron salt solution, mixing, placing the product in a water bath, reacting, leaving still, taking out the clear liquid, freeze-drying, and heat-treating in an inert atmosphere. USE - Porous graphene-supported carbon-coated iron oxide nanoparticle composite material is used as lithium ion battery material. DETAILED DESCRIPTION - A porous graphene-supported carbon-coated iron oxide nanoparticle composite material is prepared by placing graphite ore powder and potassium permanganate in a polytetrafluoroethylene-lined reactor, adding concentrated sulfuric acid, reacting at 80-100 degrees C for 1-5 hours, slowly pouring the reaction product into water in an amount of 20-50 times the weight of the concentrated sulfuric acid, vigorously stirring, dripping hydrogen peroxide in the resultant product, obtaining yellow material, washing the resultant product with dilute hydrochloric acid and water, centrifuging, taking out bottom impurities, ultrasonically dispersing for more than 2 hours, obtaining 0.5-20 mg/mL graphene oxide solution, configuring an iron salt solution by dissolving cetyltrimethylammonium bromide in water, obtaining a clear cetyltrimethylammonium bromide solution, adding iron salt, stirring to completely dissolve and adding ammonia solution, stirring the graphene oxide solution and the aqueous iron salt solution, ultrasonically mixing, placing the resultant product in a water bath, reacting at 80-100 degrees C for 0.5-5 hours, leaving still at room temperature, taking out the clear liquid, freeze-drying, heat-treating in an inert atmosphere, and obtaining graphene-loaded carbon-coated iron oxide nanoparticles. An INDEPENDENT CLAIM is included for preparation of porous graphene-supported carbon-coated iron oxide nanoparticle composite material.