As shown in FIG. 6, when the thickness direction of the active material film 300 and the oriented direction (oriented direction of the active material particle unit) of the electrode active material are substantially in parallel to each other, gap between the particles form open pores to form a fluid transfer path across the film from the surface of the active material film to the interface with the current collector side, and the electrolyte solution (and lithium ions) may permeate stably and uniformly, substantially regardless of the thickness of the film.
In addition, as shown in FIG. 5, even when the active material film is a film having an electrode active material interparticle neck formed therein, that is, a cut film sliced from the sintered body in the initial sintering stage, likewise, pore channels across the open surface pores and the thickness of the active material film are uniformly formed by continuous gap between particles, and the electrolyte solution (and lithium ions) may permeate stably and uniformly, substantially regardless of the thickness of the film.
The adhesive layer 400 may include a resin having curability. Here, having curability means having an ability to lose flowability and be hardened by chemical change, drying (removal by volatilization of solvent), or solidification.
