Thus, binder-free may be interpreted as organic binder-free, and a binder-free active material bulk (binder-free molded body or binder-free sintered body) may mean a molded body or a sintered body containing no organic binder. As a specific example, the binder-free sintered body may include a sintered body composed of an active material; a sintered body composed of an active material and residual carbon (residual carbon by organic binder decomposition or the like); a sintered body composed of an active material and a conductive material; a sintered body composed of an active material, a conductive material, and residual carbon; a sintered body composed of an active material and a carbon precursor-derived carbon; a sintered body composed of an active material, a carbon precursor-derived carbon, and residual carbon; a sintered body composed of an active material, a conductive material, and a carbon precursor-derived carbon; a sintered body composed of an active material, a conductive material, a carbon precursor-derived carbon, and residual carbon, and the like.
As described above, by the production-methodical configuration of the present invention, the active material film may be a binder-free film containing no organic binder. Without limitation to this, the active material film which is a binder-free film may be composed of an electrode active material, composed of an electrode active material and a conductive material, or composed of an electrode active material and carbon serving as a binder.