▎ 摘　　要

NOVELTY - Metal-air battery is using a modified diaphragm, and comprises a positive electrode, a metal negative electrode sheet and an electrolyte. A bionic catechol/polyamine modified diaphragm is provided between the positive electrode sheet and the metal negative electrode sheet. USE - Metal-air battery. ADVANTAGE - The metal-air battery has modified diaphragm, which has excellent underwater adhesion and oxidation resistance, improves the electrode-electrolyte interface when used in metal-air batteries, inhibits the side reactions associated with active oxygen in the battery and promoting the growth of discharge products in the electrolyte solvent phase also inhibit the shuttling effect of I3 and protect the lithium negative electrode, and preparation method has a significant cost advantage and has a good practical prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation method of modified diaphragm.