Separator Substrate For Electrochemical Device, And Separator Comprising Same

Abstract: The present invention relates to a separator substrate, a separator, and an electrochemical device comprising same. The separator substrate according to the present invention is for an electrochemical device and comprises a crosslinked polyolefin resin and chromium (Cr), wherein the crosslinked polyolefin resin comprises a silicon-containing organic group grafted onto a polyolefin chain, the gel fraction of the separator substrate is 3% to 80%, the standard deviation (?d) of thicknesses measured at at least any 100 points is 0.5 µm or less, and the number of spots having a long-side length of 50 µm or more is 10 or less per 1 m2.

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