FIG. 4 is a drawing illustrating a cross section of an active material film 300 produced by slicing an active material bulk which is a molded body, and FIG. 5 is a drawing illustrating a cross section of an active material film 300 produced by slicing the active material bulk which is a sintered body. For a clear understanding of FIGS. 4 and 5, FIGS. 4 and 5 illustrate the case in which the active material film (or active material bulk) is composed of an electrode active material, but as described above, the active material bulk may further include an additive, such as a conductive material, a carbon-based precursor, and/or a binder, or course.
As an example shown in FIGS. 4 and 5, the active material positioned on the surface of the active material film may be cut particulates, by the production-methodical configuration in which the active material film 300 is a cut film sliced from the active material bulk 200. Here, the cut surface of the cut particulates may be in parallel to the surface of the active material film 300. In other words, the surface of the active material film 300 may include cut surfaces of the cut particulates.
Here, when the active material bulk is a molded body as in FIG. 4, the cut particulates may mean having a shape in which internal particles are cut along, one optional plane, based on the shape of the electrode active material particles (internal particles) positioned in the inner center of the active material bulk.
