▎ 摘　　要

NOVELTY - Preparing functionallized graphene comprises uniformly mixing Hummers graphite powder and sodium nitrate to obtain a mixture, adding concentrated sulfuric acid to the mixture and then stirring under ice cooling, slowly adding potassium permanganate to the mixture and then stirring, adding hydrogen peroxide to obtained solution and then stirring, washing solution with nitric acid, drying the solution to obtain graphite oxide, grinding graphite oxide into powder, placing powder in quartz tube, oxidizing the powder, placing the quartz tube in a furnace and then heating to obtain nanosheets. USE - The method is useful for preparing functionallized graphene that is useful for preparing a lithium-ion battery anode material (all claimed). ADVANTAGE - The method is capable of simply preparing the functionallized graphene with improved structural stability and high productivity thus providing the battery with good discharge capacity and cycle performance. DETAILED DESCRIPTION - Preparing functionallized graphene comprises uniformly mixing 1 g of Hummers graphite powder and 0.75 g of sodium nitrate to obtain a mixture, adding 34 ml of concentrated sulfuric acid to the mixture and then stirring under ice cooling, slowly adding 4.5 g of potassium permanganate to the mixture and then stirring for 2 hours, adding 10 ml of sulfuric acid having a concentration of 5% to the mixture and then stirring for 5 days, adding 3-5 ml of hydrogen peroxide to obtained solution and then stirring for 2 hours until no air bubbles are formed, washing the solution with nitric acid having a concentration of 10% for three times, then washing the solution with nitric acid having a concentration of 5% for two times and then washing with deionized water, drying the solution at 250 degrees C to obtain graphite oxide, grinding graphite oxide into powder, placing the graphite oxide powder in a quartz tube and then weighing, oxidizing the powder by supplying a mixed gas of argon gas and air or oxygen in volume ratio of 1:0.001-0.2, placing the quartz tube in a furnace and then heating at 300-1100 degrees C for 1-20 minutes to obtain functionalized graphene nanosheets, heating the nanosheets under mixed gas atmosphere of argon and hydrogen at 500-1000 degrees C for 0.5-10 hours, and reducing graphene nanosheets under mixed gas atmosphere of argon and hydrogen in a ratio of 95:5.