Patent ID: 8129049
Filing Date: 2012-03-06
Classification: H01M,Y02E,Y02P

Abstract:
1. A jelly-roll of a cathode/separator/anode structure, wherein the jelly-roll is constructed in a structure in which the cathode and the anode have active material layers formed on opposite major surfaces of a sheet current collector, a loading amount of an active material for an inner active material layer, constituting an inner surface of the sheet current collector when the sheet current collector is wound, is less than that of an active material for an outer active material layer, constituting an outer surface of the sheet current collector when the sheet current collector is wound, and a loading amount of the active material for the outer active material layer is uniform, whereas the loading amount of the active material for the inner active material layer gradually increases from a central region of the sheet current collector to an outermost region of the sheet current collector, and the loading amount of the active material for the inner active material layer at a winding termination end, where the loading amount of the inner active material is largest, is less than that of the active material for the outer active material layer, and wherein the inner and outer active material layers have the same density, and a difference of the loading amount of the active material between the inner and outer active material layers is based on a difference in thickness between the inner and outer active material layers.