The present invention relates to an electrode assembly and a lithium secondary battery comprising the same. The electrode assembly comprises one or more first electrodes including anodes, one or more second electrodes including cathodes and a separation film. The separation film is used for separating the first electrode and the second electrode laminated alternatively and is constructed to have a plurality of bending portions. The separation film comprises a first porous polymer substrate, a first coating layer forming on one surface of the porous polymer substrate and having a polymer adhesive and a second coating layer forming on the other surface of the porous polymer substrate and having a mixture of a polymer adhesive and inorganic particles. The first coating layer surface faces the anode. The second coating layer surface faces the cathodes. The compositions, the thickness and the porosity of the second coating layer are different from the first porous coating layer. The electrode assembly of the invention can enhance mechanical performance and finally raise safety degree of a battery.