An electrode assembly includes a positive electrode including a positive active material layer on each of first and second surfaces of a positive electrode current collector, a negative electrode including a negative active material layer on each of first and second surfaces of a negative electrode current collector, and an inner separator between the positive electrode and the negative electrode, wherein each of the positive electrode and the negative electrode includes a side end uncoated region at respective side ends of the positive electrode and the negative electrode, the side end uncoated regions of each of the positive and negative electrodes including no active material layers on respective electrode current collectors, and wherein at least one of the positive electrode and the negative electrode has an inner uncoated region positioned at a center of the electrode assembly, the inner uncoated region including no active material layer thereon.