| abstract |
Disclosed is an electrode assembly having a structure in which two or more unit cells are sequentially stacked or folded by means of a long, sheet-type separation film, the unit cells comprising bi-cells each comprising a cathode, an anode and a separator, wherein at least one from among the bi-cells comprises a safety electrode in which electrode active material is coated only on one side of the electrode current collector, the safety electrode comprising a first side on which electrode active material is not coated and a second side on which the electrode active material is coated, and in the bi-cell comprising the safety electrode, an additional safety separator is provided on the first side and/or the second side thereof, the safety separator having a thickness which is 110-220% of the thickness of a separator of the bi-cell interposed in between the anode and cathode or between the cathode and anode, excluding the safety electrode. |