▎ 摘　　要

NOVELTY - Preparing nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises (i) premixing graphite, nitrogen-containing compounds, functional additives, grinding aids, adding into a disc-shaped mechanochemical reactor, grinding, and introducing the cooling liquid, (ii) washing the obtained mixture with deionized water to remove excess nitrogen-containing compounds and water-soluble grinding aids, drying i.e. vacuum freeze drying or air-blast drying and obtaining nitrogen-doped graphene, and (iii) uniformly mixing nitrogen-doped graphene obtained above with 100 pts. wt. polymer using internal mixer or a twin-screw extruder, and determining the processing temperature, or adding nitrogen-doped graphene obtained above and 1-10 pts. wt. rheology modifier into solvent, and stirring using a high-speed homogenizer, forming a stable high-viscosity dispersion, and placing the high-viscosity dispersion in a freeze-drying machine to freeze-dry or dry naturally. USE - The method is useful for preparing nitrogen-doped graphene-based high-performance electromagnetic shielding material. ADVANTAGE - The method is convenient and simple, easy to scale production, and realizes low cost preparation of doped graphene, and broadens application of the graphene in the field of high performance electromagnetic shielding material has great significance. DETAILED DESCRIPTION - Preparing nitrogen-doped graphene-based high-performance electromagnetic shielding material comprises (i) premixing 100 pts. wt. graphite, 5-20 pts. wt. nitrogen-containing compounds, 10-100 pts. wt. functional additives, 1-5 pts. wt. grinding aids, adding into a disc-shaped mechanochemical reactor, grinding at 30-100 revolutions/minute with pressure of 3-15 MPa, introducing the cooling liquid to take away the heat generated so that the temperature of the grinding disc surface is controlled at 20-50 degrees Celsius, where the number of milling is controlled at 5-40 times to obtain a nitrogen-doped graphene mixture containing water-soluble impurities, (ii) washing the obtained mixture with deionized water to remove excess nitrogen-containing compounds and water-soluble grinding aids, drying i.e. vacuum freeze drying or air-blast drying and obtaining nitrogen-doped graphene, and (iii) uniformly mixing 10-30 pts. wt. nitrogen-doped graphene obtained above with 100 pts. wt. polymer using internal mixer or a twin-screw extruder at 30-100 revolutions/minute, and determining the processing temperature according to the type of polymer to obtain nitrogen-doped graphene-based electromagnetic shielding material, or adding 1-5 pts. wt. nitrogen-doped graphene obtained above and 1-10 pts. wt. rheology modifier into 20-40 pts. wt. solvent, and stirring at 5000-20000 revolutions/minute for 20-60 minutes using a high-speed homogenizer, forming a stable high-viscosity dispersion, and placing the high-viscosity dispersion in a freeze-drying machine to freeze-dry or dry naturally. An INDEPENDENT CLAIM is also included for nitrogen-doped graphene-based high-performance electromagnetic shielding material prepared by the above mentioned method.