▎ 摘　　要

NOVELTY - Use of graphene oxide composite film for replacing ion exchange membrane in raw flow battery, is claimed. USE - The graphene oxide composite film is useful for replacing ion exchange membrane in raw flow battery (claimed). ADVANTAGE - The method of applying film has long-term stable operation in flow battery, reduces the use cost, applies composite membrane with flat membrane with good mechanical strength, ion selective permeability and oxidation resistance and solves problem of high cost of commercial ion exchange membrane and severe ion penetration.