Electrode assembly having improved safety, manufacturing method therefor and electrochemical element comprising electrode assembly

1. A lithium secondary battery comprising:

an electrode assembly comprising:

a positive electrode consisting of a positive electrode current collector, a positive electrode active material layer, and a first porous coating layer stacked in a sequential order, wherein the first porous coating layer is directly coated on a surface of the positive electrode and laminated for bonding; and

a negative electrode consisting of a negative electrode current collector, a negative electrode active material layer, and a second porous coating layer stacked in a sequential order, wherein the second porous coating layer is directly coated on a surface of the negative electrode and laminated for bonding,

wherein the first porous coating layer or the second porous coating layer is an organic porous coating layer, and the other is an inorganic porous coating layer, and

the organic porous coating layer and the inorganic porous coating layer face each other,

wherein the inorganic porous coating layer comprises inorganic particles and an organic binder polymer, and

the organic porous coating layer comprises organic particles and is free of inorganic particles,

wherein the electrode assembly does not contain a free standing film type separator, and

wherein the organic particles are formed from at least one selected from the group consisting of high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, high crystalline polypropylene, polyethylene-propylene copolymer, polyethylene-butylene copolymer, polyethylene-hexene copolymer, polyethylene-octene copolymer, polystyrene-butylene-styrene copolymer, polystyrene-ethylene-butylene-styrene copolymer, polystyrene, polyphenylene oxide, polysulfone, polycarbonate, polyester, polyurethane, polyacrylate, polyvinylidene chloride, polyvinylidene fluoride, polysiloxane, polyolefin ionomer, polymethyl pentene, hydrogenated oligocyclopentadiene (HOCP), and their derivatives.

2. The electrode assembly according to claim 1 , wherein organic particles that make up the organic porous coating layer have a melting point of 180° C. or less.

3. The electrode assembly according to claim 1 , wherein the organic porous coating layer is coated in an amount of between 0.1 and 7 g/m 2 on a surface of the electrode active material layer.

4. The electrode assembly according to claim 1 , wherein the inorganic porous coating layer includes inorganic particles having a dielectric constant of 5 or higher, inorganic particles having an ability to transport lithium ions, or their mixtures.

5. The electrode assembly according to claim 4 , wherein the inorganic particles having a dielectric constant of 5 or higher are BaTiO 3 , Pb(Zr,Ti)O 3 (PZT), Pb 1-x La x Zr 1-y Ti y O 3 (PLZT), PB(Mg 1/3 Nb 2/3 )O 3 —PbTiO 3 (PMN-PT), hafnia (HfO 2 ), SrTiO 3 , SnO 2 , CeO 2 , MgO, NiO, CaO, ZnO, ZrO 2 , Y 2 O 3 , Al 2 O 3 , TiO 2 , or their mixtures.

6. The electrode assembly according to claim 4 , wherein the inorganic particles having an ability to transport lithium ions are lithium phosphate (Li 3 PO 4 ), lithium titanium phosphate (Li x Ti y (PO 4 ) 3 , 0<x<2, 0<y<3), lithium aluminum titanium phosphate (Li x Al y Ti z (PO 4 ) 3 , 0<x<2, 0<y<1, 0<z<3), (LiAlTiP) x Oy based glass (0<x<4, 0<y<13), lithium lanthanum titanate (Li x La y TiO 3 , 0<x<2, 0<y<3), lithium germanium thiophosphate (Li x Ge y P z S w , 0<x<4, 0<y<1, 0<z<1, 0<w<5), lithium nitride (Li x N y , 0<x<4, 0<y<2), SiS 2 based glass (Li x Si y S z , 0<x<3, 0<y<2, 0<z<4), P 2 S 5 based glass (Li x P y S z , 0<x<3, 0<y<3, 0<z<7), or their mixtures.

7. The electrode assembly according to claim 1 , wherein the inorganic porous coating layer is coated in an amount of between 1 and 30 g/m 2 on a surface of the electrode active material layer.

8. The electrode assembly according to claim 1 , wherein the inorganic particles have a diameter in a range of between 0.1 and 1.0 μm, and the organic particles have a diameter in a range of between 0.05 and 1.0 μm.