PET non-woven fabric for separation membrane of secondary batteries and separation membrane for secondary batteries comprising same

The present invention relates to technique associated with a PET non-woven fabric for a separation membrane of secondary batteries, and a separation membrane for secondary batteries comprising same. The present invention provides a PET non-woven fabric for a separation membrane of secondary batteries, comprising a first fiber consisting of polyethylene terephthalate (PET) having the a melting point of 240 DEG C or more and a second fiber consisting of polyethylene terephthalate (PET) having the a melting point ranging from 180 to 220 DEG C, wherein each of the fibers is prepared by mixing two types of fibers having different diameters from one another from each other. According to the present invention, the PET non-woven fabric has a fine pore size, homogeneous distribution, an outstanding surface propertyproperties, less fewer surface defects, high mechanical strength, and an excellent productivity. Further, the present invention has heat resistance such that thermal runaway is prevented and melting and cont