Electrode property of the composite of metal oxides and carbon materials prepared with aqueous solution methods for metal-oxygen batteries

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The search of the oxides that function as electrodes in metal-oxygen batteries was performed. Since oxygen atoms in a metal oxide instead of gaseous oxygen molecules in air can be used as active materials if the metal oxide allows insertion or extraction of oxygen atoms, various oxides were investigated in terms of oxygen insertion and extraction. As a result, it was found that a few iron-based and a nickel-based oxides with perovskite-related structures allow reversible oxygen extraction or insertion. By using these materials, a new type battery in which oxygen atoms were shuttled between a cathode and an anode electrode via an aqueous alkaline electrolyte was constructed. Further another new type battery that was composed of the oxide allowing oxygen extraction for a cathode, a metal, such as Li and Na, for an anode, and an organic electrolyte was demonstrated.