SEPARATOR FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING SAME

The present invention relates to a separator for a lithium secondary battery and a lithium secondary battery including the separator, the separator for a lithium secondary battery including: a polyolefin-based porous substrate; and a coating layer on at least one surface of the polyolefin-based porous substrate, wherein a coefficient of performance Q1 of the polyolefin-based porous substrate as represented by Equation 1 is greater than or equal to 1.2 (gf/nm·µm), a coefficient of performance Q2 of the polyolefin-based porous substrate as represented by Equation 2 is greater than or equal to 0.25 (gf/nm·%), and the coating layer includes a binder and inorganic particles. Q1=PgfSnm×TμmQ2=PgfSnm×R%Detailed descriptions of Equations 1 and 2 are as described in the specification.