Lithium secondary battery with electrode protective layer and initial capacity ratio and manufacturing method thereof

摘要

In a lithium secondary battery provided by the present invention, the layer density on a side facing a protective layer (46) in a negative electrode active material layer (44) and/or positive electrode active material layer where the protective layer is formed, the protective layer containing an insulating filler and a binder, is higher than the layer density in a central portion and a side facing a current collector (42) in the negative electrode active material layer and/or positive electrode active material layer where the protective layer is formed.