▎ 摘　　要

NOVELTY - A multifunctional composite film for chemical power supply comprises graphene conduction layer (2) and membrane layer (1), both are mutually attached. The graphene conduction layer has thickness of 0.3 nm to 10 mm, pore diameter of 0-1 mm, and porosity of 0-80%. The membrane layer has thickness of 0.3 nm to 10 cm, pore diameter of 0-100 mu m, and porosity of 0-80%. USE - As multifunctional composite film which is useful for chemical power supply; and for chemical supply lithium-ion batteries, sodium ion subcell lithium-sulfur batteries, sodium sulfur batteries, super capacitors, fuel cells, and flow batteries (claimed). ADVANTAGE - The multifunctional composite film improves the conductivity of the current collector; reduces battery internal resistance; improves energy density power supply; improves mechanical strength and thermal stability of the separator; improves safety performance of the power supply; and has great application value. DESCRIPTION OF DRAWING(S) - The figure shows a view of the composite film. Membrane layer (1) Graphene conduction layer (2)