Importance

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Abstract

Provided is a technique for effectively producing a lithium-ion secondary battery which exhibits a stable cell performance, and has a high degree of freedom of choice of its shape, an improved output density and a reduced size, at a reduced cost. A lithium-ion secondary battery having a laminar body wherein a positive electrode layer and a negative electrode layer are laminated on respective opposite surfaces of a solid electrolyte layer is produced by: forming a first vapor-deposited polymer film while introducing a positive electrode active substance into the first vapor-deposited polymer film, to form the positive electrode layer; forming a second vapor-deposited polymer film while introducing a negative electrode active substance into the second vapor-deposited polymer film, to form the negative electrode layer; and forming a third vapor-deposited polymer film while introducing a lithium-ion conductivity rendering substance into the third vapor-deposited polymer film, to form the solid electrolyte layer.

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First Claim