Battery

A battery, comprising:

• a first electrode layer;
• and
• a second electrode layer disposed on the first electrode layer and serving as a counter electrode for the first electrode layer,
• wherein the first electrode layer includes a first current collector, a first active material layer, and a first solid electrolyte layer,
• the first active material layer is disposed to be in contact with the first current collector and to occupy a smaller area than that of the first current collector with respect to a plan view,
• the first solid electrolyte layer is disposed to be in contact with the first current collector and the first active material layer, wherein the first solid electrolyte layer and the first current collector occupy a same coextensive area with respect to the plan view,
• the first active material layer faces the second electrode layer with the first solid electrolyte layer therebetween,
• the first electrode layer includes a peripheral portion including a first rounded portion,
• the second electrode layer includes a second current collector and a second active material layer,
• the second active material layer is disposed to be in contact with the second current collector and to occupy a smaller area than that of the second current collector with respect to the plan view,
• the first solid electrolyte layer is disposed to be in contact with the second current collector and the second active material layer, wherein the first solid electrolyte layer and the second current collector occupy the same coextensive area with respect to the plan view,
• the second active material layer faces the first active material layer with the first solid electrolyte layer therebetween,
• the second current collector includes a peripheral portion including a second rounded portion,
• the first rounded portion and the second rounded portion have an identical shape, and
• the first electrode layer and the second electrode layer are disposed on each other, and an edge portion of the first rounded portion and an edge portion of the second rounded portion are located to coincide with each other.