| 摘要 |
Disclosed is an electrode used in a wound electrode assembly, the electrode including: a current collector; a first material mixture layer including a first active material, which is formed on one surface of the current collector; and a second material mixture layer including a second active material, which is formed on the other surface of the current collector. When an electrode assembly is assembled, the first material mixture layer is wound in a manner such that it is positioned on the outer side of the second material mixture layer. In a part corresponding to a predetermined region of a cross section of said electrode assembly perpendicular to the winding axis thereof, the radius of curvature of the predetermined region being 3.0×10−3 m or less, the capacity per unit volume of the first material mixture layer is higher than the capacity per unit volume of the second material mixture layer. |
