Separator for lithium secondary battery and lithium secondary battery comprising same

Abstract

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. Q ⁢ 1 = P ⁡ ( g ⁢ f ) S ⁡ ( nm ) × T ⁡ ( μm ) ⁢ [ Equation ⁢ ⁢ 1 ] Q2 = P ⁡ ( g ⁢ f ) S ⁡ ( nm ) × R ⁡ ( % ) [ Equation ⁢ ⁢ 2 ] Detailed descriptions of Equations 1 and 2 are as described in the specification.

Dependencies are inferred from the claim text.