Lithium-ion secondary battery and method for producing same

A lithium-ion secondary battery comprising:

• a wound electrode body including a strip-shaped positive electrode plate, a strip-shaped negative electrode plate, and a strip-shaped separator, which are wound so that the separator is interposed between the positive electrode plate and the negative electrode plate;
• a nonaqueous electrolytic solution containing LiPF6;
• and
• a battery case in which the wound electrode body and the nonaqueous electrolytic solution are stored,
• wherein the positive electrode plate includes a positive current collecting foil formed of an aluminum foil, and a positive active material layer laminated on a surface of the positive current collecting foil, and
• the positive electrode plate is configured such that:
• a positive electrode laminated part is defined by a portion in which the positive active material layer is laminated on the surface of the positive current collecting foil, and
• the positive electrode laminated part includes:
• current collecting foil end portions, which are end portions of the positive current collecting foil included in the positive electrode laminated part, the end portions being located at both ends of the positive electrode laminated part in an axial direction of the wound electrode body;
• and
• a current collecting foil central portion, which is a central portion of the positive current collecting foil included in the positive electrode laminated part, the central portion being located at a center of the positive electrode laminated part in the axial direction of the wound electrode body, and
• an amount of AlF3 per unit area is greater on each of surfaces of the current collecting foil end portions of the positive electrode laminated part than on a surface of the current collecting foil central portion of the positive electrode laminated part.