Separator having porous coating layer including PVDF-HFP block copolymer and method for manufacturing same

A method for manufacturing a separator for an electrochemical device, comprising the steps of:

• (S1) preparing a porous polymer substrate;
• and
• (S2) applying slurry for forming a porous coating layer comprising an organic solvent, a plurality of inorganic particles and a binder polymer onto at least one surface of the porous polymer substrate, and drying the porous polymer substrate coated with the slurry to form a porous coating layer,
• wherein the binder polymer comprises a block copolymer consisting of a first block having repeating units represented by Chemical Formula 1 and a second block having repeating units represented by Chemical Formula 2, and
• wherein a content of the block copolymer is 50 parts by weight or more based on 100 parts by weight of a total content of the binder polymer:
• wherein each of x and y independently represents an integer of 1 or more,
• wherein a weight ratio of the inorganic particles to the binder polymer is 70:30 to 99:1.