▎ 摘　　要

NOVELTY - Preparing nitrogen-doped egg-yolk carbon sphere/graphene composite material involves pouring 160ml of deionized water and a certain amount of absolute ethanol into a three-necked bottle after sonication, and add 0.5-1.0 ml of ammonia, and placing the three-neck bottle in a cold bath at (-10)-0 degrees C. The 1.0-3.0 g resorcinol is added, stirred for about 30 minutes to dissolve, at the same time weighed 2.0 g of melamine and a certain amount of formaldehyde in a beaker, and stirred for 10-30 minutes in a 60 degrees C water bath. The liquid is poured in the beaker into a three-necked flask, stirred for 10 minutes, added 0-5.0 ml of formaldehyde solution to it, and stirred for 24 hours. The obtained product is washed alternately with deionized water and absolute ethanol for 4 times, and freeze-dried the product to obtain phenolic resin-based hollow spheres. USE - Method for preparing nitrogen-doped egg-yolk carbon sphere/graphene composite material. ADVANTAGE - The method enables to prepared nitrogen-doped egg-yolk carbon sphere/graphene composite material, that greatly improves the conductivity and energy storage performance of the graphene-based composite material. DETAILED DESCRIPTION - Preparing nitrogen-doped egg-yolk carbon sphere/graphene composite material involves pouring 160ml of deionized water and a certain amount of absolute ethanol into a three-necked bottle after sonication, and add 0.5-1.0 ml of ammonia, and placing the three-neck bottle in a cold bath at (-10)-0 degrees C. The 1.0-3.0 g resorcinol is added, stirred for about 30 minutes to dissolve, at the same time weighed 2.0 g of melamine and a certain amount of formaldehyde in a beaker, and stirred for 10-30 minutes in a 60 degrees C water bath. The liquid is poured in the beaker into a three-necked flask, stirred for 10 minutes, added 0-5.0 ml of formaldehyde solution to it, and stirred for 24 hours. The obtained product is washed alternately with deionized water and absolute ethanol for 4 times, and freeze-dried the product to obtain phenolic resin-based hollow spheres. The product is placed in a crucible for pre-carbonization in a tube furnace under the conditions including argon atmosphere 300-500 degrees C, heating rate 1-3 degrees Cminute-1, holding time is 1-3 hours, to obtain carbonization product which is dark orange powder. The 0.1-0.6 g of the obtained powder is weighed, physically blended with 1.0mgml-1 graphite oxide solution, and mechanically stirred for 4 hours. The 1.2-2.4 g of potassium hydroxide (KOH) is weighed and dissolveed in 50 ml of deionized water, and slowly added to the above solution. The mixed solution is freez-dried, and placed the dried product in a tube furnace for high-temperature carbonization treatment. The carbonized product is pickled in a 0.1 molL-1 hydrochloric acid solution for 6 hours, centrifuged and washed the product various times to neutral, and put in a blast drying box and dry it completely to obtain a nitrogen-doped egg-yolk-like carbon ball/graphene composite material.