Electrode assembly and lithium secondary battery including the same

1. An electrode assembly comprising a cathode, an anode, and a separator disposed between the cathode and the anode wherein the anode comprises lithium titanium oxide (LTO) as an anode active material and the separator is a non-woven separator having a porosity of 45 to 90%,

wherein the non-woven separator is made of polyester and the lithium titanium oxide is Li 1.33 Ti 1.67 O 4 or LiTi 2 O 4 ,

wherein the cathode is a high-voltage cathode comprising a spinel-structure lithium nickel manganese composite oxide (LNMO) represented by Formula 3 below as a cathode active material:

Li x Ni y Mn 2-y O 4   (3)

wherein 0.9≦x≦1.2, and 0.4≦y≦0.5.

2. The electrode assembly according to claim 1 , wherein the lithium nickel manganese composite oxide of Formula 3 is LiNi 0.5 Mn 1.5 O 4 or LiNi 0.4 Mn 1.6 O 4 .

3. The electrode assembly according to claim 1 , wherein the non-woven separator has a porosity of 50 to 70%.

4. The electrode assembly according to claim 1 , wherein the polyester is polybutyleneterephthalate.

5. A secondary battery comprising an electrode assembly according to claim 1 .

6. The secondary battery according to claim 5 , wherein the secondary battery is a lithium secondary battery.

7. A battery module comprising the secondary battery according to claim 6 as a unit battery.

8. A battery pack comprising the battery module according to claim 7 .

9. A device comprising the battery pack according to claim 8 .

10. The device according to claim 9 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.