Abstract: A secondary battery includes a battery electrode assembly in which positive electrode 1 and negative electrode 6 are stacked alternately with separator 20 interposed therebetween. Positive electrode 1 and negative electrode 6 each have current collector 3, 8 and active material 2, 7. Each surface of current collectors 3, 8 has a coated portion and an uncoated portion of active materials 2, 8. Active material 2, 7 has inclined portions 2a, 7a having decreasing thickness. Insulators 40 are arranged to cover boundaries 4a between the coated portion and the uncoated portion of positive electrode 1. One or both of insulators 40 on both surfaces of positive electrode current collector 3 have one end 40a which is located on inclined surface 2a and which is opposite to inclined portion 7a of one or both of active materials 7 on both surfaces of negative electrode current collector 3, and have other end 40b which is located on uncoated portion of positive electrode 1.

Abstract: A secondary battery includes a battery electrode assembly in which positive electrode 1 and negative electrode 6 are stacked alternately with separator 20 interposed therebetween. Positive electrode 1 and negative electrode 6 each have current collector 3, 8 and active material 2, 7. Each surface of current collectors 3, 8 has a coated portion and an uncoated portion of active materials 2, 8. Active material 2, 7 has inclined portions 2a, 7a having decreasing thickness. Insulators 40 are arranged to cover boundaries 4a between the coated portion and the uncoated portion of positive electrode 1. One or both of insulators 40 on both surfaces of positive electrode current collector 3 have one end 40a which is located on inclined surface 2a and which is opposite to inclined portion 7a of one or both of active materials 7 on both surfaces of negative electrode current collector 3, and have other end 40b which is located on uncoated portion of positive electrode 1.

Abstract: To provide an electrode ensuring excellent characteristics even when the electrode formed on a foil-like collector is compressed under a comparatively low temperature condition. An electrode manufacturing method comprising the steps of: coating an active material layer onto a surface of a collector excluding a non-coating area to form a coating area; drying the coated active material layer; and increasing a density of the dried active material layer by compression to form a high density area. In the compression step, a low density area having a lower density than the high density area is formed in a strip-shaped coating area adjacent to the non-coating area of the active material layer.