▎ 摘　　要

NOVELTY - The method comprises mixing coal, nano calcium carbonate and potassium hydroxide, grinding, placing the mixture in a corundum porcelain boat, placing the corundum porcelain boat in a tube furnace, discharging the inert gas from the furnace, maintaining pressure in the tube furnace at atmospheric pressure or negative pressure of -0.05 Mpa to -0.1 Mpa, heating the mixture, removing the resulting product from the furnace, grinding the product, washing the product with distilled water, and drying to obtain a porous super capacitor graphene material. The inert gas is nitrogen or argon. USE - The method is useful for producing a graphene material for a supercapacitor (claimed). ADVANTAGE - The method is capable of simply producing the graphene material with higher capacity and energy density in an economical manner. DETAILED DESCRIPTION - The method comprises mixing coal, nano calcium carbonate and potassium hydroxide, grinding the mixture, placing the mixture in a corundum porcelain boat, placing the corundum porcelain boat in a tube furnace, discharging the inert gas from the furnace, maintaining pressure in the tube furnace at atmospheric pressure or negative pressure of -0.05 Mpa to -0.1 Mpa, heating the mixture at a rate of 5 degrees C/minute to a temperature of 200 degrees C for 0.5 hour, continuously heating the mixture at a heating rate of 5 degrees C/minute to a temperature of 750 degrees C for 1 hour, and again heating the mixture at a heating rate of 5 degrees C/minute to a temperature of 950 degrees C for 1 hour, removing the resulting product from the furnace, grinding the product, washing the product with distilled water, and drying to obtain a porous super capacitor graphene material. The inert gas is nitrogen or argon.