▎ 摘　　要

NOVELTY - Preparing graphene foam positive electrode sheet, comprises e.g. (a) adding graphite oxide and polyacrylonitrile into ball mill, performing ball milling for 30-60 minutes, and adding the ball-milled mixture into ethanol and water mixed solution for ultrasonic dispersion to form suspension having concentration of 1-20 g/l, and (b) immersing nickel foam in the suspension for 10-60 minutes, evaporating solvent, placing in muffle furnace, reacting at 800-1100 degrees C under hydrogen and nitrogen mixture atmosphere for 1-10 hours, and naturally cooling. USE - The positive electrode is useful for lithium-sulfur battery (claimed). ADVANTAGE - The method is easy to perform and directly provides positive electrode. The positive electrode provides lithium-sulfur battery having high specific energy of 2600 Wh/kg, and high specific capacity of 1675 mAh/g. DETAILED DESCRIPTION - Preparing graphene foam positive electrode sheet, comprises (a) adding graphite oxide and polyacrylonitrile into ball mill, performing ball milling for 30-60 minutes, and adding the ball-milled mixture into ethanol and water mixed solution for ultrasonic dispersion to form suspension having concentration of 1-20 g/l, (b) immersing nickel foam in the suspension for 10-60 minutes, evaporating solvent, placing in muffle furnace, reacting at 800-1100 degrees C under hydrogen and nitrogen mixture atmosphere for 1-10 hours, and naturally cooling, (c) impregnating the product obtained in step (b) in 1-3 mol/l hydrochloric acid and reacting at 60-80 degrees C for 5-10 hours to obtain graphene foam, and (d) coating elemental sulfur powder on the surface of the graphene foam, placing in a sealed container, reacting at 120-180 degrees C for l-5 hours, cooling and rolling to obtain an electrode.