Separator For Electrochemical Device, And Electrode Assembly And Electrochemical Device Comprising Same

Abstract: The present invention relates to a separator for an electrochemical device, the separator comprising a porous substrate, and a porous coating layer formed on at least one surface of the porous substrate, wherein the porous coating layer comprises a binder polymer and an inorganic filler and satisfies [Equation 1] below. [Equation 1] 20 = [content of the inorganic filler (wt%) x BET surface area of the inorganic filler (m2/g)] / [content of the binder polymer (wt%)] = 30 (the content of the binder polymer and the content of the inorganic filler are based on 100% by weight in total of the porous coating layer) The separator for an electrochemical device, according to the present invention, secures the safety of the electrochemical device, and also enhances the adhesion between the porous substrate and the porous coating layer of the separator and the adhesion between the separator and an electrode, and can improve heat resistance stability.

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