Method of manufacturing separator for rechargeable battery, separator for rechargeable battery, and rechargeable battery including the same

Abstract

The present disclosure relates to a method of manufacturing a separator for a rechargeable battery, a separator for a rechargeable battery, and a rechargeable battery including the separator. The method includes manufacturing a porous film including a mixture of a polyolefin resin and a polyurethane resin. The porous film is manufactured by stretching a base film including the mixture of the polyolefin resin and the polyurethane resin to manufacture a stretched film and thermally compressing the stretched film. The polyurethane resin is included in the mixture in an amount in a range of about 15 wt % to about 60 wt %. The thermally compressing includes thermally compressing the stretched film to a range of about ½ to about ⅓ of its thickness at a temperature equal to or higher than a glass transition temperature of the polyurethane resin.

Dependencies are inferred from the claim text.