In particular, as in an example shown in the lower part of FIG. 2, when the cutting direction (CD) of the active material bulk 200 is parallel to the pressed direction of the pressed particles, that is, in vertical direction to the pressed surface of the pressed particles, the thickness direction of the active material film 300 and the oriented direction of the active material particles (pressed particles) are substantially parallel to each other, and thus, electrolyte solution impregnation into a space between particles and diffusion of ions involved in charge/discharge such as lithium ions may be performed more smoothly.