Electrochemical Device Polyolefin Separator, And Electrochemical Device Comprising Same

Abstract: The present invention provides an electrochemical device polyolefin separator having a plurality of pores and comprising a polyolefin resin, wherein the polydispersity index (PDI) of the polyolefin resin is 2.5-4.2, the average size of the pores is 20-40 nm, the maximum size of the pores is 50 nm or less, and the electrochemical device separator has a strain of 25% or less when a tensile deformation stress of 15 MPa is applied at 60°C for 60 seconds, and the time required for a recovery rate thereof to reach 70% is 200 seconds or less when a tensile deformation stress of 2 MPa is applied at 70°C for 180 seconds, and then removed.

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