▎ 摘　　要

NOVELTY - Porous carbon-sulfur complex cathode material comprises e.g. 35-50 pts. wt. modified graphene porous carbon material, 200-230 pts. wt. ethylene glycol, 10-15 pts. wt. dopant, 2-6 pts. wt. carbon black, 15-25 pts. wt. elemental sulfur, and 225-250 pts. wt. N-methylpyrrolidone, where the porous carbon-sulfur complex cathode material for a lithium-sulfur batter is prepared by: (i) adding the modified graphene porous carbon material to ethylene glycol, performing ultrasonication, forming suspension A, then adding the dopant, transferring to a hydrothermal kettle, and heating at 45 degrees C in a water bath, stirring at a speed of 120 revolutions/minute for 15 minutes, filtering, washing three times with absolute ethanol, and drying to obtain doped modified graphene porous carbon material, and (ii) adding carbon black and elemental sulfur to N-methylpyrrolidone, heating at 40 degrees C in a water bath, and performing ultrasonication until the elemental sulfur is dissolved to obtain suspension B. USE - The cathode material is useful for lithium-sulfur batteries (claimed). ADVANTAGE - The cathode material: has porous structure, wrinkled morphology, extremely high specific surface area and porosity and good electrical conductivity; and does not produce aggregation. The method: provides a channel for the rapid transfer of electrons and facilitates charge transfer. DETAILED DESCRIPTION - Porous carbon-sulfur complex cathode material comprises 35-50 pts. wt. modified graphene porous carbon material, 200-230 pts. wt. ethylene glycol, 10-15 pts. wt. dopant, 2-6 pts. wt. carbon black, 15-25 pts. wt. elemental sulfur, and 225-250 pts. wt. N-methylpyrrolidone, where the porous carbon-sulfur complex cathode material for a lithium-sulfur batter is prepared by: (i) adding the modified graphene porous carbon material to ethylene glycol, performing ultrasonication, forming suspension A, then adding the dopant, transferring to a hydrothermal kettle, and heating at 45 degrees C in a water bath, stirring at a speed of 120 revolutions/minute for 15 minutes, filtering, washing three times with absolute ethanol, and drying to obtain doped modified graphene porous carbon material, (ii) adding carbon black and elemental sulfur to N-methylpyrrolidone, heating at 40 degrees C in a water bath, and performing ultrasonication until the elemental sulfur is dissolved to obtain suspension B, and (iii) adding suspension B to suspension A, stirring at a speed of 150 revolutions/minute for 30 minutes, adding deionized water, centrifuging, washing with deionized water three times, and drying the porous to obtain porous carbon-sulfur complex anode material for lithium-sulfur battery. An INDEPENDENT CLAIM is also included for preparing a porous carbon-sulfur complex cathode material for a lithium-sulfur battery comprising (I) adding the modified graphene porous carbon material to ethylene glycol and performing sonication to form suspension A, and then adding a dopant, transferring to a hydrothermal kettle, heating in a 45 degrees C water bath, and stirring at a speed of 120 revolutions/minute for 15 minutes, then filtering, washing three times with anhydrous ethanol and drying to obtain a doped modified graphene porous carbon material, (II) adding carbon black and elemental sulfur to N-methylpyrrolidone, heating at 40 degrees C in a water bath, and performing sonication until the elemental sulfur is dissolved to obtain suspension B, and (III) adding suspension B to suspension A, stirring at a speed of 150 revolutions/minute for 30 minutes, adding deionized water, centrifuging, washing three times with deionized water, and drying to obtain the porous carbon-sulfur complex anode material for a lithium-sulfur battery.