▎ 摘　　要

NOVELTY - The metal air battery (100) has metal anode (102), and cathode (106) including graphene membrane. An electrolyte (104) is disposed between the metal anode and cathode, and the graphene membrane includes graphene in an amount of at least 80% by weight of the graphene membrane. The metal anode is lithium metal anode, and the electrolyte is an aprotic electrolyte. The graphene membrane includes graphene in the amount of at least 90% by weight of the graphene membrane. The graphene membrane includes interconnected graphene sheets that form a porous structure. USE - Metal air battery. ADVANTAGE - Allows the battery incorporating the membrane cathode to achieve a high capacity and long cycle life in both oxygen and ambient air conditions since a cave-like architecture with inner passages or tunnels and hydrophobic nature of reduced graphene oxide allow the graphene membrane to resist moisture in ambient air from penetrating into an interior of the graphene membrane. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a forming method for cathode for metal-air battery. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a metal air battery. Metal air battery (100) Metal anode (102) Electrolyte (104) Cathode (106)