As the calendar percentage increased, the apparent porosity observed in the pristine electrodes decreased, as observed in Table . It can also be noted that the calendering process orients the graphite grains (preferentially with a flat shape) adjacent to the current collector. The graphite grains seem to cluster at the electrode surface and bottom, as expected when using a roll-press. The two compositions of Si differentiate in the porous shape and size when calendering. For instance, the appearance of the pores in the Si 8% is mainly rounded, arranged vertically, and larger. In contrast, the pores present in the Si15% are oriented horizontally with a scratch-like shape and are smaller.