▎ 摘　　要

NOVELTY - Preparation of holey graphene (C2N)/porous graphene composite material involves: (a) pore-forming graphene oxide to obtain a porous graphene oxide aerogel; and (b) mixing the porous graphene oxide aerogel, hexaaminobenzene and cyclohexanone, heating and reacting. USE - The method is useful for preparing C2N/porous graphene composite material used for preparing separator (all claimed) of lithium-sulfur battery. ADVANTAGE - The method provides C2N/porous graphene composite material, which can be used to modify the separator of lithium-sulfur battery, effectively inhibits the shuttle effect, enables the lithium-sulfur battery to maintain high energy density, and improves the cycle performance of the battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) the C2N/porous graphene composite material; (2) a separator, which comprises a separator base material, and the C2N/porous graphene composite material; and (3) preparation of the separator.