▎ 摘　　要

NOVELTY - The method involves dispersing graphene oxide and polyacrylonitrile uniformly in an organic solvent to obtain a spinning solution, and electrospining the spinning solution to obtain polyacrylonitrile / graphene oxide nanofibers. The polyacrylonitrile / graphene oxide nanofiber filaments are pre-pressed and shaped under a pressure of 0.3-0.7MPa to obtain a PAN/GO nanofiber film. The polyacrylonitrile / graphene oxide nanofiber film is subjected to a secondary pressure treatment at room temperature under a pressure of 2-10 MPa to obtain a self-supporting structure diaphragm for a lithium-sulfur battery. The mass ratio of graphene oxide and polyacrylonitrile is 1:10. The organic solvent is N,N-dimethylformamide. Graphene oxide and polyacrylonitrile are stirred in an organic solvent for 12-18 hours to obtain a spinning solution. The thickness of the separator of the self-supporting structure for lithium-sulfur batteries is 25-35 mu m. USE - Method for preparing self-supporting structure diaphragm for lithium-sulfur batteries. ADVANTAGE - The method is configured to enable preparing the self-supporting structure with uniform pore distribution, controllable thickness, membrane wetting property and heat stability, improved ion transmission performance, and enhanced electrochemical performance and safety performance of the lithium sulfur battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a separator with a self-supporting structure for a lithium-sulfur battery. DESCRIPTION OF DRAWING(S) - The drawing shows a pictorial view of the polyacrylonitrile and graphene oxide composite film.