▎ 摘　　要

NOVELTY - Sulfur/polypyrrole/graphene/carbon nano-tube composite film comprises 55-60 wt.% elemental sulfur, 1-10 wt.% polypyrrole, 20-25 wt.% functionalized multi-walled carbon nano-tube and reduced graphene oxide (balance amount). The pyrrole is mixed with graphene oxide and is polymerized in situ to obtain polypyrrole and graphene oxide is reduced to reduced graphene oxide. The polypyrrole is grafted onto the reduced graphene oxide. The reduced graphene oxide and the functionalized multi-walled carbon nano-tube are interwoven to form three-dimensional carbon skeleton. The elemental sulfur is supported on surface and interior of three-dimensional carbon skeleton. USE - The composite film is useful as lithium sulfur battery anode (claimed). ADVANTAGE - The composite film: solves problems of inherent non-conductivity of elemental sulfur and shuttle effect of polysulfide; and improves electrochemical performance of lithium-sulfur battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite film, comprising (i) adding graphene oxide aqueous solution into ethanol aqueous solution, ultrasonically dispersing for 0.5-2 hours, adding pyrrole, stirring uniformly, allowing to stand at room temperature for 2-3 days, adding sodium polystyrene sulfonate, heating to 80-90 degrees C under stirring for 2-4 hours and after reaction is completed, cooling to room temperature, centrifuging, washing and dispersing in water having purity more than the deionized water to obtain polypyrrole/graphene composite aqueous solution, where, the mass ratio of graphene oxide, pyrrole and sodium polystyrene sulfonate is 1:10-100:5-10; (ii) adding functionalized multi-walled carbon nano-tube into polypyrrole/graphene composite aqueous solution, stirring uniformly, adding Triton X-100 (RTM: Non-ionic surfactant) and ultrasonically dispersing for 10-60 minutes to obtain polypyrrole/graphene/carbon nano-tube composite aqueous solution, absorbing composite aqueous solution, vacuum-filtering with polypropylene film, drying and peeling off from the polypropylene film to obtain polypyrrole/graphene/carbon nanotube composite film, where, the functionalized multi-walled carbon nanotube is a multi-walled carbon nanotube containing a polar functional group, the mass of the functionalized multi-walled carbon nanotube is 1-3 times the mass of the graphene oxide in the step (i) and the polypyrrole/graphene/carbon nano-tube composite film has thickness of 10-30 mu m; (iii) uniformly adding sulfur toluene solution into the polypyrrole/graphene/carbon nanotube composite film and heating to 150-160 degrees C for 8-12 hours and heating to 240-300 degrees C for 0.5-1 hour under inert gas protection to obtain a sulfur/polypyrrole/graphene/carbon nano-tube composite film, where, the mass of sulfur added to polypyrrole/graphene/carbon nanotube composite film is 1-30 mg.