TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Gas: The oxidizing atmosphere contains oxygen gas and has an oxygen gas equilibrium partial pressure of 0.1-1 atm. Preferred Components: The current collector powder comprises copper, nickel, palladium, gold and/or platinum. The active material powder comprises a first phosphoric acid compound capable of absorbing and releasing lithium ions, and the solid electrolyte powder comprises a second phosphoric acid compound having lithium ion conductivity. The first phosphoric acid compound is of formula LiMPO4. The second phosphoric acid compound is of formula Li1+x(M3)x(Ti4)2-x(PO4).M=Mn, Fe, Co, and/or Ni; andM3=Al, Y, Ga, In, and/or La; andx=0-0.6. EXAMPLE - A solid electrolyte slurry containing lithium-aluminum-titanium phosphate (100 pbw), polyvinyl butyral resin (15 pbw), dibutyl phthalate (7 pbw) and n-butyl acetate (130 pbw) was applied onto a carrier film of polyester resin and dried at 150degreesC for 30 minutes to obtain a solid electrolyte green sheet. A positive electrode active material green sheet was formed on a carrier film using a positive electrode active material slurry comprising lithium-cobalt phosphate (100 pbw), polyvinyl butyral resin (15 pbw), dibutyl phthalate (7 pbw) and n-butyl acetate (130 pbw). The solid electrolyte green sheet was placed on polyester film. At 80degreesC, a pressure of 100 kg/cm was applied and the carrier film was peeled off from the solid electrolyte green sheet. Another solid electrolyte green sheet was placed on this solid electrolyte green sheet. Pressure was applied and the carrier film was peeled off from the solid electrolyte green sheet. This process was repeated 20 times to produce a solid electrolyte green sheet group. The positive electrode active material green sheet was placed on the solid electrolyte green sheet group. Pressure was applied and the carrier film was peeled off from the positive electrode active material green sheet. A first green sheet group was obtained. The first green sheet group was peeled off from the polyester film and cut into a 7 micronsx7 mm piece to obtain a green chip. A current collector slurry comprising copper powder (100 pbw), polyvinyl butyral resin (15 pbw), dibutyl phthalate (7 pbw) and n-butyl acetate (130 pbw) was applied to the positive electrode active material green sheet of green chip, and dried at 150degreesC for 30 minutes to form a current collector green sheet layer. A second green sheet group was obtained. The second green sheet group was sandwiched by two alumina plates, and heated to 350degreesC in air (equilibrium partial pressure of oxygen gas: 0.2 atm) with an increasing temperature rate of 400degreesC/hour. The temperature was held at 350degreesC for 5 hours to cause thermal decomposition of organic matter. The second green sheet group was heated to 900degreesC in reduced gas containing carbon dioxide, hydrogen and nitrogen at a volume ratio of 4.99/0.01/95 with an increasing temperature rate of 1000degreesC/hour, and cooled with a decreasing temperature rate of 1000degreesC/hour. A laminate comprising solid electrolyte layers, active material layer and current collector layer was obtained and used in making a coin-type battery.