| abstract |
A power storage device with large capacity is provided. Alternatively, a power storage device with high energy density is provided. Alternatively, a highly reliable power storage device is provided. Alternatively, a power storage device with a long lifetime is provided. An active material, a binder, and a conductive additive are mixed to form a slurry, the slurry is applied onto a current collector, the applied slurry is dried to form an active material layer, and heated in an atmosphere containing oxygen Performing a treatment to form a film in contact with the current collector, the film is formed on the surface of the current collector where the active material layer is not provided, and at least one of the components of the current collector, oxygen, It is a manufacturing method of the electrode characterized by having. |