TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal anode is at least one of lithium, sodium, potassium, calcium, magnesium, aluminum, zinc or their alloys. The air cathode includes at least one of precious metals, metal oxides, or organic metal complexes. The precious metal is at least one of platinum, gold or silver, the metal oxide is at least one of manganese, nickel or cobalt, and the organic metal complex is at least one of metalloporphyrin or metal phthalocyanine. The organic electrolyte and the aqueous electrolyte include a lithium containing compound as an electrolytic salt. The lithium containing compound is at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium bis(trifluoromethylsulfonyl)imide, lithium bis(perfluoroethylsulfonyl)imide, lithium triflate, (tris((trifluoromethyl)sulfonyl)methyl)lithium, lithium hexafluoroarsenate, lithium hexafluoroantimonate, lithium iodide, lithium trifluoromethyl acetate, lithium tris(pentafluoroethyl)trifluoro phosphate, tris(perfluoroethyl)trifluorolithium, tris(trifluoromethyl)trifluorolithium, lithium tetrafluorobis(perfluoroethyl)phosphate(V), lithium tetrafluorobis(trifluoromethyl)phosphate(V), lithium pentafluoro(perfluoroethyl)phosphate(V) or lithium pentafluoro(trifluoromethyl)phosphate(V). The aqueous electrolyte is an alkaline electrolyte having a pH of 10-12.5. In the battery, a separation membrane is included between the organic electrolyte and the aqueous electrolyte. The separation membrane is: a solid separation membrane that transmits only metal ions configuring a metal anode; or an organic polymer or inorganic complex separation membrane without reactivity against the electrolyte, where the inorganic matter is at least one of silicon, titanium, zirconium, aluminum, calcium or magnesium. The solid separation membrane is a solid inorganic separation membrane made of at least one of silicon, titanium, zirconium, aluminum, calcium or magnesium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: In the battery, a solvent of the organic electrolyte includes at least one of ethylene carbonate, propylene carbonate, butylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dimethyl ether, diethyl ether, tetrahydrofuran, methyl tetrahydrofuran, dioxolane, methyl dioxolane, sulfolane, gamma-butyrolactone, dimethyl formamide, dimethyl sulfoxide, dimethoxy ethane, ethyl acetate, methyl acetate, methyl lactate or ethyl propionate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The organic polymer is an oxygen atom containing organic polymer compound with a weight-average molecular average of 100000-5000000. The organic polymer compound is at least one of polyethylene oxide, polypropylene oxide, polyoxymethylene or their derivatives. EXAMPLE - Preparing a cell was performed in an argon glove box in which a dew point was less than or equal to -60 degrees C. First, a lithium metal was used as the battery case. The lithium metal was disposed as the case of the anode and the anode including the aluminum metal as the active material layer on the aluminum metal on the anode collector was formed on the lithium metal. A silica solid separation membrane was formed on the anode and the cathode was formed on the top of the solid separation membrane. The cathode consisted of the active material layer having a type in which manganese dioxide was mixed in a porous carbon. In addition, the lithium metal was disposed as the case of the cathode and then, a portion of the case of the cathode was formed with a porous membrane in order to have the open battery case into which the external oxygen might be introduced. The aluminum anode was introduced with the organic electrolyte and 1.2M lithium hexafluorophosphate or ethylene carbonate:propylene carbonate:ethyl methyl carbonate (3:1:4), and the air cathode was introduced with the aqueous electrolyte (with pH of 11) including 1.2M sodium hydroxide. Thus metal air battery was prepared.