Patent ID: 8067115

Claim:
A non-aqueous electrolyte secondary battery comprising: a negative electrode having a current collector provided thereon with convex portions, and columnar bodies formed on the convex portions, each of the columnar bodies comprising n stages of columnar body portions overlaid one after another in a manner to tilt alternately to different orientations along a longitudinal direction of the current collector; a positive electrode having a positive electrode current collector provided on both surfaces thereof with a positive electrode mixture layer containing a positive electrode active material capable of inserting and extracting lithium ions reversibly; and a separator interposed between the positive electrode and the negative electrode in a confronting manner, wherein n≧2, and odd numbered stages have a height different than even numbered stages, the stage closest to the convex portion being an odd numbered stage, and wherein tip portions of the columnar body portions at the uppermost stage of the columnar bodies on the negative electrode are tilted toward a trailing end of winding direction.