▎ 摘　　要

NOVELTY - Lithium-oxygen battery comprises: a lithium anode comprising a red poly(benzonitrile) coating covering at least a portion of the anode; an air cathode comprising reduced graphene oxide over gas diffusion layer; and an electrolyte comprising an ether solvent, benzonitrile and a lithium salt. USE - The lithium-oxygen battery is useful in electrochemical device. ADVANTAGE - The battery is configured to: cycle at a rate of greater than 200 mA/g, preferably 200-1000 mA/g and a capacity of greater than 200 mAh/g, preferably 200-3000 mAh/g; cycle at a current density of 50-1000 mA/g and a capacity of 500-3000 mAh/g; and cycle at a rate of 500 mA/g and a capacity of 500 mAh/g. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing (M1) a lithium-oxygen battery, comprising providing lithium anode, air cathode comprising reduced graphene oxide, and electrolyte comprising an ether solvent, benzonitrile, and lithium salt forming an electrochemical cell, and cycling the electrochemical cell to form a coating of red poly(benzonitrile) on at least a portion of the lithium anode; and (2) forming (M2) iridium (or rhodium) catalyst on an air cathode, comprising heating a reduced graphene oxide impregnated with iridium(cyclooctadiene)(acetylacetonate) (or rhodium(cyclooctadiene)(acetylacetonate)) in the presence of hydrogen to decompose the rhodium(cyclooctadiene)(acetylacetonate)) and form iridium(or rhodium) particles on the reduced graphene oxide to form the air cathode.