NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

[Objet] Provided is a non-aqueous electrolyte secondary battery having high vibration resistance when an aqueous binder is used as a binder for a negative electrode active material. [Solving Means] Disclosed is a flat laminated type non-aqueous electrolyte secondary battery having a power generating element including a positive electrode obtained by forming a positive electrode active material layer on a surface of a positive electrode current collector; a negative electrode obtained by forming a negative electrode active material layer on a surface of a negative electrode current collector; and a separator, in which the negative electrode active material layer includes 2 to 4% by mass of an aqueous binder with respect to the total mass of the negative electrode active material layer, and the negative electrode active material layer has a rectangular shape, wherein a ratio of a length of long side to a length of short side of the rectangle is 1 to 1.25.