Electrode assembly, battery cell including the electrode assembly, and method of preparing the battery cell

This application aims at an electrode assembly prepared by stacking and winding a first electrode, a second electrode, and a separator disposed between the first and second electrodes, wherein the electrode assembly is curved to the center of an axis about parallel to a length direction of the electrode assembly, and wherein the separator comprises a layer coated with a thermoplastic polymer on at least one side thereof, a battery cell including the electrode assembly, and a method of preparing the battery cell. The battery cell including the electrode assembly may improve an adherence between a separator and an electrode plate.