Method for manufacturing secondary battery

A method for manufacturing a secondary battery including a stacked electrode body including a plurality of first electrode plates and a plurality of second electrode plates, the first electrode plates each having a belt-like substrate, an active material layer formed on the belt-like substrate, and a tab portion composed of a substrate exposed portion where the active material layer is not formed, wherein the belt-like substrate and the tab portion are formed of a single integral piece of material, the method comprising:

• an active material layer formation step of forming the active material layer on both sides of the belt-like substrate such that a substrate exposed portion is formed along a longitudinal direction of the belt-like substrate;
• a tab portion formation step of cutting the substrate exposed portion into a predetermined shape to form the tab portion;
• a cutout forming step of providing at least one cutout in a peripheral region of each first electrode plate that is located directly adjacent to a base of the tab portion and in which the active material layer is formed, wherein the peripheral region includes at least a portion of the belt-like substrate which is directly adjacent to and distinct from the tab portion and has the active material layer formed thereon;
• and
• a compressing step of compressing the active material layer after the cutout forming step,
• wherein a protective layer containing ceramic particles and a binder is formed on the tab portion before the cutout forming step, and
• wherein the at least one cutout is also formed in a region where the protective layer is formed.