NOVELTY - The separator (113) comprises a polyolefin base film (110) and a coating layer (130), where the coating layer contains inorganic particles (70-90 pts. wt.) having an average particle size of 1-700 nm, an organic binder of a polyvinylidene fluoride homopolymer (5-10 pts. wt) having an average molecular weight of 1000000-1200000 g/mol and an organic binder of a polyvinylidene fluoride-hexafluoropropylene copolymer (5-20 pts. wt.) having an average molecular weight of less than or equal to 800000 g/mol. The coating layer has a density of 1.2-2 g/m3, a thickness of less than or equal to 10 mu m and a peel strength of greater than or equal to 50 gf/cm2.    USE - The 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 separator (113) comprises a polyolefin base film (110) and a coating layer (130), where the coating layer contains inorganic particles (70-90 pts. wt.) having an average particle size of 1-700 nm, an organic binder of a polyvinylidene fluoride homopolymer (5-10 pts. wt) having an average molecular weight of 1000000-1200000 g/mol and an organic binder of a polyvinylidene fluoride-hexafluoropropylene copolymer (5-20 pts. wt.) having an average molecular weight of less than or equal to 800000 g/mol. The coating layer has a density of 1.2-2 g/m3, a thickness of less than or equal to 10 mu m and a peel strength of greater than or equal to 50 gf/cm2, and is disposed on one or both sides of the base film. An adhesive strength between the coating layer and electrodes of a lithium rechargeable battery is greater than or equal to 20 gf/cm2. The electrodes include a positive and a negative electrode. An INDEPENDENT CLAIM is included for an electrochemical battery.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a separator for a rechargeable battery.    Base film (110)    Separator (113)    Coating layer. (130)