| 摘要 |
A lithium secondary battery provided by the present invention includes a spirally wound electrode body in which a positive electrode sheet and a negative electrode sheet are spirally wound with a separator sheet 40 interposed therebetween, wherein on a sheet surface of at least any one from among the positive electrode sheet, negative electrode sheet, and separator sheet 40 constituting the spirally wound electrode body, a porous layer 60 is formed along a longitudinal direction of the sheet 40, and the porous layer 60 is thicker in a spiral winding direction of the spirally wound electrode body in a winding center portion 62 than in a winding outer portion 64.
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