BATTERY AND PRODUCTION METHOD FOR BATTERY

A battery according to the present disclosure includes a first electrode, a second electrode, and a solid state electrolyte layer disposed between the first electrode and the second electrode, the solid state electrolyte layer containing at least a solid state electrolyte and at least carbon atoms and including a carbon unevenly distributed layer. The concentration of the carbon atoms in the carbon unevenly distributed layer is higher than the concentration of the carbon atoms in a region of the solid state electrolyte layer excluding the carbon unevenly distributed layer.