NOVELTY - Rechargeable metal-air battery comprising: (a) a negative electrode capable of taking and releasing active metal ions; (b) a porous positive electrode using oxygen as an electroactive material; (c) an electrolyte (402)configured to conduct ions between the negative and positive electrodes and comprising one or more phases, where at least one phase comprises a liquid and at least partially fills the pores of the positive electrode, and the liquid comprises an oxygen evolving catalyst (403d).    USE - Used as rechargeable metal-air battery.    ADVANTAGE - The metal-air battery exhibits improved performance characteristics compared to conventional metal-air batteries, particularly lower charging voltages, higher charging rates and/or improved cycle life. The provision of the oxygen evolving catalyst (OEC) can allow a larger quantity of metal oxide discharge product to be efficiently charged because direct electronic contact with the air electrode need not be maintained. Thus an air electrode containing an OEC can be fabricated having higher product loadings, which in turn facilitates the practical coupling of air electrodes with negative electrode materials that are manufactured in a de-lithiated state.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method comprising providing a first component that comprises an oxygen evolving catalyst, providing a second component that comprises a metal oxide discharge product, and forming an air electrode that comprises the first component and the second component;    (2) an air electrode for use in a metal-air battery, comprising (a) an electronically conductive component, (b) a metal oxide, and (c) an oxygen evolving catalyst; and    (3) a material for use in a rechargeable metal-air battery, where the material is (a1) soluble in a liquid employed in the battery, (b1) electrochemically activated at a potential above the equilibrium cell voltage, and (c1) capable of evolving oxygen gas by oxidizing a metal oxide discharge product produced during discharge of the rechargeable metal-air battery.    DESCRIPTION OF DRAWING(S) - The figures shows schematic view of the lithium-air battery containing an oxygen evolving catalyst.    Electrolyte (402)    Air electrode (403)    Air electrode surface (403a)    Metal-oxide discharge products (403b, 403c)    Oxygen evolving catalyst. (403d)