Lithium-sulfur battery separator and lithium-sulfur batteries using the same

A lithium-sulfur battery comprising a positive electrode;

• a negative electrode;
• an electrolytic solution;
• and
• a lithium-sulfur battery separator comprising:
• a separator substrate comprising a first surface and a second surface opposite to the first surface;
• and
• a functional layer covered on at least one surface of the first surface and the second surface, and the functional layer comprises:
• at least two carbon nanotube layers;
• and
• at least two graphene oxide composite layers alternatively overlapped with the at least two carbon nanotube layers, wherein each of the at least two graphene oxide composite layers comprises a plurality of graphene oxide sheets overlapped with each other and a plurality of manganese dioxide nanoparticles, and the plurality of manganese dioxide nanoparticles are located on the plurality of graphene oxide sheets and embedded in an interlayer formed by the at least two carbon nanotube layers and the plurality of graphene oxide sheets.