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The oxidation of a carbon binder that occurred during a charge in a carbon–air electrode for a Li-air battery resulted in an excessively high charge potential of 4.2 V. The air electrode activity for the Li-air battery was studied on various metals or metal oxides and the mixture of Pd and shows the high activity to oxidation and reduction of Li to form or, respectively. Although the discharge capacity decreased, the application of without a carbon binder for the air electrode is effective to decrease the charge potential and to improve the energy efficiency from 60 to 89%.