Patent ID: 8883347

Claim:
An all solid state secondary battery which comprises a laminated material in which a positive-electrode unit and a negative-electrode unit are alternately laminated through an ion-conductive inorganic-material layer, wherein the positive-electrode unit has positive active material layers on both surfaces of a positive-electrode collector layer, the above-mentioned negative-electrode unit has negative active material layers on both surfaces of a negative-electrode collector layer, wherein the laminated material comprises the positive active material layer formed from a calcined powder as a starting material, the negative active material layer formed from a calcined powder as a starting material, and the ion-conductive inorganic-material layer formed from a calcined powder as a starting material, wherein the positive active material layer comprises a lithium compound selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn 2 O 4 , LiCuO 2 , LiCoVO 4 , LiMnCoO 4 , LiCoPO 4 and LiFePO 4 , wherein the negative active material layer comprises a lithium compound selected from the group consisting of Li 4/3 Ti 5/3 O 4 , LiTiO 2 and LiM1 s M2 t O u wherein M1 and M2 are transition metals, s, t and u are optional positive numbers, wherein the difference between a maximum value and a minimum value of a linear shrinkage rate, defined as (an initial thickness−thickness after heating to a temperature of the co-firing while applying a load of 0.44 g/mm 2 )/initial thickness×100, of the calcined powder of the positive active material, the calcined powder of the negative active material, and the calcined powder of the ion-conductive inorganic material is within 6%.