Patent ID: 7803486

Claim:
A power storage device comprising: a positive electrode and a negative electrode; and a solid electrolyte layer placed between the positive electrode and the negative electrode and including a group of particles, wherein a density of particles per volume in a first area of the solid electrolyte layer is lower than a density of particles per volume in a second area which has higher heat radiation than the first area such that current value is lower, and resistance higher, in the first area than in the second area, in order to reduce heat production in the first area, and to prevent variation in temperature distribution in a predetermined direction in the power storage device, the predetermined direction being a direction orthogonal to a stacking direction of the positive electrode, the negative electrode and the solid electrolyte layer, wherein the first area is an area located in the predetermined direction on a central portion side of the solid electrolyte layer, and the second area is an area located in the predetermined direction closer to an end portion than the first area.