METHOD OF PRODUCING LITHIUM ION SECONDARY BATTERY

A method of producing a lithium ion secondary battery includes preparing an alkaline negative electrode composite material including a negative electrode active material, a binder, an alkaline component, and an aqueous solvent; adding an oxalate complex lithium salt that is acidic in the aqueous solvent to the alkaline negative electrode composite material; and applying the negative electrode composite material to which the oxalate complex lithium salt is added to a surface of a negative electrode current collector and drying the negative electrode composite material to form a negative electrode active material layer.