Patent ID: 9099739
Filing Date: 2015-08-04
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
1. A lithium secondary battery comprising a positive electrode including a high-voltage positive active material; and a separator, wherein the separator comprises a substrate of polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer thereof, wherein the high-voltage positive active material has a discharge plateau voltage of about 4.6V to about 5.3V with respect to a Li counter electrode and the high-voltage positive active material is selected from at least one olivine-based lithium metal phosphate and a compound represented by Chemical Formula 1: wherein, M is selected from the group consisting of Al, Ti, Mg, Zn, and combinations thereof, and the separator comprises a porous substrate having porosity of about 40% to about 60%; and a coating layer on at least one side of the porous substrate, wherein the coating layer comprises a polymer and a metal filler.