| abstract |
PROBLEM TO BE SOLVED: To provide a power storage device having a large capacity. Alternatively, a power storage device having a high energy density is provided. Alternatively, a highly reliable power storage device is provided. Alternatively, a power storage device having a long life is provided. SOLUTION: An active material, a binder and a conductive auxiliary agent are mixed to form a slurry, the slurry is applied onto a current collector, and the applied slurry is dried to form an active material layer, and an atmosphere containing oxygen. Underneath, heat treatment is performed to form a film in contact with the current collector, which is formed on the surface of the current collector without an active material layer and with at least one of the components of the current collector. , Oxygen, and the like, which is a method for producing an electrode. [Selection diagram] Fig. 1 |