TY - JOUR AB - Lithium-metal oxides with a high formal Li2O content, such as Li5FeO4 (5Li2O•Fe2O3) and a Li2MnO3•LiFeO2 composite ({Li2O•MnO2}•{Li2O•Fe2O3}) have been explored as electrocatalysts for primary and rechargeable Li-O2 cells. Activation occurs predominantly by Li2O removal, either electrochemically or chemically by acid-treatment. Superior electrochemical behavior is obtained if activation occurs by acid-treatment; Li2MnO3•LiFeO2 catalysts provide 2516 mAh/g (carbon) corresponding to 931 mAh/g (electrocatalyst + carbon) during the initial discharge. The reaction is reasonably reversible during the early cycles. The approach has implications for designing electrocatalysts that participate through electrochemical Li2O extraction/reformation reactions, offering exceptionally high capacities. AU - Trahey, L. AU - Johnson, C. S. AU - Vaughey, J. T. AU - Kang, S.-H. AU - Hardwick, L. J. AU - Freunberger, Stefan Alexander AU - Bruce, P. G. AU - Thackeray, M. M. ID - 7317 IS - 5 JF - Electrochemical and Solid-State Letters SN - 1099-0062 TI - Activated Lithium-Metal-Oxides as catalytic electrodes for Li–O2 cells VL - 14 ER -