Non-aqueous electrolyte secondary battery, electrode body used therefor, and method of manufacturing the electrode body

A method of manufacturing an electrode body,

• the electrode body including a positive electrode, a negative electrode, and a separator,
• the positive electrode including a positive electrode active material layer containing a positive electrode active material,
• the negative electrode including a negative electrode active material layer containing a negative electrode active material,
• the separator electrically separating the positive electrode and the negative electrode from each other, and
• the method comprising:
• preparing a positive electrode in which the positive electrode active material layer is formed on a positive electrode current collector by applying a positive electrode active material layer-forming composition, which contains the positive electrode active material and N-methylpyrrolidone, to the positive electrode current collector, the positive electrode active material layer containing N-methylpyrrolidone;
• laminating the positive electrode, and the negative electrode with the separator interposed therebetween to obtain a laminate;
• and
• standing of the laminate, to stand for a predetermined amount of time such that a part of N-methylpyrrolidone in the positive electrode active material layer is moved into the separator;
• and
• drying the laminate after the standing, wherein
• the standing and the drying are performed such that a N-methylpyrrolidone content in the positive electrode active material layer of the dry laminate is 54 ppm to 602 ppm with respect to a total solid content of the positive electrode active material layer, and a N-methylpyrrolidone content in the separator of the dry laminate is 10 ppm to 26 ppm with respect to the total solid content of the positive electrode active material layer.