▎ 摘　　要

NOVELTY - Composite polymer electrolyte membrane comprises a sulfonated graphene oxide, polymers (first and second), and a dispersing agent. USE - Composite polymer electrolyte membrane used for energy storage devices such as secondary battery or fuel cell (claimed). ADVANTAGE - The composite polymer electrolyte membrane with improved mechanical strength and enhanced ionic conductivity, is manufactured in a cost-effective manner. The polymer has high hydrogen ion conductivity for carrying proton exchange in energy storage devices. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing composite polymer electrolyte membrane, which involves: (A) formulating the macromolecular polymers and sulfonated graphene oxide, where the prepared mixture is dried at optimized condition to obtain composite film precursor; and (B) mixing the dispersing agent solution with the obtained composite film precursor, where the resulting mixture is cast in a mold at certain conditions to obtain the finished product.