Manufacturing method of electrode plate, manufacturing method of secondary battery, electrode plate, and secondary battery

A method for manufacturing an electrode plate comprising an electrode core body being a metal foil and an electrode active material layer provided on a surface of the electrode core body,

• the method comprising:
• a precursor preparation step for preparing an electrode precursor comprising an active material provided area on the surface of the electrode core body, and a core body exposed area;
• and
• a core body exposed area cutting step for cutting off the core body exposed area with a laser so as to form an electrode tab, wherein
• the electrode core body comprises a first surface, and a second surface disposed at an opposite side of the first surface,
• a surface roughness of the second surface is smaller than a surface roughness of the first surface, wherein the surface roughness of the second surface measured in accordance with ISO 25178 is 0.14 μm or less, and the surface roughness of the first surface measured in accordance with ISO 25178 is 0.25 μm or less, and
• in the core body exposed area cutting step, the laser is irradiated to the first surface.