Method for making lithium-sulfur battery separator

A method for making a lithium-sulfur battery separator comprising

• step (S1), providing a separator substrate comprising a first surface and a second surface opposite to the first surface;
• and
• step (S2), forming a functional layer on at least one surface of the first surface and the second surface, and a method for forming the functional layer on at least one surface of the first surface and the second surface comprises sub-steps of:
• step (S21), applying a first carbon nanotube layer on the at least one surface of the first surface and the second surface;
• step (S22), providing a plurality of graphene oxide sheets and a plurality of manganese dioxide nanoparticles;
• dispersing the plurality of graphene oxide sheets and the plurality of manganese dioxide nanoparticles in a solvent to form a mixture;
• and depositing the mixture on a surface of the first carbon nanotube layer to form a first graphene oxide composite layer;
• step (S23), applying a second carbon nanotube layer on a surface of the first graphene oxide composite layer;
• and
• step (S24), forming a second graphene oxide composite layer on a surface of the second carbon nanotube layer.