| abstract |
The present invention provides a lithium secondary battery comprising a positive electrode having a positive electrode active material layer, a negative electrode having a negative electrode active material layer, an electrode assembly including a separator separating the positive electrode and the negative electrode and an electrolyte, wherein the negative electrode active material layer is lithium And a metal material capable of alloying with the separator, and the separator includes a porous film formed by bonding a ceramic material and a binder, wherein the thickness of the porous film is 7 to 20% of the thickness of the negative electrode active material layer, and the entire porous film. It relates to a lithium secondary battery, characterized in that the content of the binder is 5 to 20% by weight relative to 100% by weight.n n n Therefore, the electrode assembly of the present invention and the lithium secondary battery having the same limit the thickness of the porous film including the ceramic material to the thickness of the metal-based negative electrode active material layer in the high capacity lithium secondary battery, and the content of the binder relative to the ceramic material of the porous film. By limiting, it is possible to provide a secondary battery having excellent internal short circuit characteristics and excellent capacity characteristics. |