NOVELTY - An anode slurry is applied on surface of aluminum foil, dried and cut to form anode (1). Then, sealant film-attached nickel terminal is welded to nickel mesh and compressed to produce cathode (2). Then, gel polymer electrolyte (4) is applied on surface of anode and heated, to form gel polymer electrolyte layer on surface of anode. Then, polyethylene separating film and cathode are laminated on anode and portion of aluminum laminate film is heat-welded, to produce battery which is pre-discharged, to produce thin film lithium-manganese oxide battery.    USE - Production of thin film lithium/manganese oxide battery used for smart card and radio-frequency identification tag.    ADVANTAGE - The thin film lithium/manganese oxide battery having improved mechanical characteristics and electrical characteristics is produced.    DETAILED DESCRIPTION - A solute which contains anodic active material (in wt.%) consisting of manganese dioxide (90), conductive material consisting of carbon black (5), and binder consisting of polyfluorovinylidene fluoride (5) is dispersed in N-methyl-2-pyrrolidone solvent, to obtain anode slurry which is applied on surface of aluminum foil having thickness of 12-20 mu m and the resultant aluminum foil is dried by passing through a drying furnace to evaporate N-methyl-2-pyrrolidone solution. Then, the dried aluminum foil is compressed with a roll press, cut into predetermined size and a portion which is not coated with the anode slurry is welded with a sealant film-attached aluminum terminal to form an anode. Then, a sealant film-attached nickel terminal is welded to a nickel mesh, compressed and cut into a predetermined size to produce a cathode. Then, a gel polymer electrolyte is applied on surface of anode using a doctor blade, and heated in hot air-circulating oven with high temperature to vaporize and remove dimethyl carbonate, and to form gel polymer electrolyte layer on surface of anode. Then, a polyethylene separating film and cathode are laminated in regular sequence on the anode in which the gel polymer electrolyte layer is formed and upper end portion of the aluminum laminate film is heat-welded. Then, bubble which is in electrode layer is removed and a portion of aluminum laminate film is heat-welded, to produce a battery which is heat-compressed, and the gel polymer electrolyte is allowed to penetrate into separating film to integrate anode, cathode, and separating film completely. Then, the resultant battery is pre-discharged, to produce thin film lithium-manganese oxide battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of thin film lithium/manganese oxide battery.    Anode (1)    Cathode (2)    Separator (3)    Gel polymer electrolyte (4)    Aluminum pouch (5)