Separator For Electrochemical Device Comprising Organic/Inorganic Composite Porous Coating Layer, And Electrochemical Device Comprising Same

Abstract: A separator for an electrochemical device, according to the present invention, comprises a porous polymer substrate and an organic/inorganic composite porous coating layer formed on at least one surface of the polymer substrate, wherein the organic/inorganic composite porous coating layer comprises particulate binder polymers and first inorganic particles, and the particulate binder polymers comprise acrylic polymer particles and hybrid polymer particles of a fluorine-based polymer and an acrylic polymer. The organic/inorganic composite porous coating layer comprises a non-particulate acrylic polymer, the particle size D50 (a) of the acrylic polymer particles is 1 µm to 7 µm, the particle size D50 (b) of the first inorganic particles is 200 nm to 800 nm, a/b is 2 to 15, and the particle size D50 of the hybrid polymer particles is 250 nm or less.

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