Composite electrodes of iron oxides and carbons for high rate electrochemical reactions of lithium-oxygen batteries

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Composite electrode materials of iron-based oxides and carbons for lithium-air batteries were investigated. Among various iron-based oxides investigated inthis study, perovskite-related A_0.5La_0.5FeO_z（A = Ca, Sr）underwent extraction and insertion of oxideions stably in wide range of oxygen composit~ion. Because of it allows reversible and repeatable extraction/reinsertion of oxide ions at fast rate ( D = 1.2×10^-13 cm^2 s^-1), Ca_0.5La_0.5FeO_2.863 was foundto be expected as an oxygen reduction catalyst (or a mediator) for air electrode of lithium-air batteries.