NOVELTY - The porous separator (113) comprises a porous base film (110), and a coating layer (130) that is provided on a surface of the porous base film and includes a polyvinylidene fluoride homopolymer (5-10 pts. wt) having an average molecular weight of 1000000-1200,000 g/mol, a polyvinylidene fluoride-hexafluoropropylene copolymer (5-20 pts. wt.) having an average molecular weight of 600000-800000 g/mol, and inorganic particles (70-90 pts. wt.). The separator exhibits a thermal shrinkage of less than or equal to 30% in a machine direction (MD) or in a transverse direction (TD).    USE - The porous separator is useful in a lithium rechargeable battery (claimed) such as a lithium metal rechargeable battery, a lithium ion rechargeable battery, a lithium polymer rechargeable battery and a lithium ion polymer rechargeable battery, which is useful in electronic devices such as mobile devices, notebook computers and electric cars.    ADVANTAGE - The separator has a slim thickness and a light weight while ensuring high adhesion and shape stability based on high heat resistance to produce batteries with high capacity, prevents short circuit between electrodes of the battery, provides a desirable thickness to prevent an excessive increase in resistance while exhibiting thermal stability and strong adhesion through the coating layer, and improves the lifespan of batteries.    DETAILED DESCRIPTION - The porous separator (113) comprises a porous base film (110), and a coating layer (130) that is provided on a surface of the porous base film and includes a polyvinylidene fluoride homopolymer (5-10 pts. wt) having an average molecular weight of 1000000-1200,000 g/mol, a polyvinylidene fluoride-hexafluoropropylene copolymer (5-20 pts. wt.) having an average molecular weight of 600000-800000 g/mol, and inorganic particles (70-90 pts. wt.). The separator exhibits: a thermal shrinkage of less than or equal to 30% in a machine direction (MD) or in a transverse direction (TD), as measured after leaving the separator at 150 degrees C for 1 hour; a peel strength of greater than or equal to 50 gf/cm2 measured between the coating layer and the base film; and an adhesive strength of greater than or equal to 20 gf/cm2 measured between the coating layer and electrodes of a lithium ion rechargeable battery. The electrodes include a positive and negative electrode. The negative electrode is crystalline carbon electrode or an amorphous carbon electrode. The coating layer has a thickness of 0.01-20 mu m. The hexafluoropropylene is present in an amount of 0.1-40 wt.%. An INDEPENDENT CLAIM is included for an electrochemical battery.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of separator for a rechargeable battery.    Porous base film (110)    Separator (113)    Coating layer. (130)