| abstract |
METHOD FOR MANUFACTURING POROUS SEPARATOR INCLUDING ELASTIC MATERIAL, POROUS SEPARATOR MANUFACTURED BY METHOD AND SECONDARY BATTERY INCLUDING SEPARATOR. The present invention relates to a method of manufacturing a porous separator and specifically a method of manufacturing a porous separator including an elastic material, a separator manufactured by the method and a secondary battery including the separator. According to one aspect, there is provided a porous separator in which an elastic material is uniformly dispersed in a polymer in a weight ratio of 40:60 to 5:95 and an elongation at break value in a low tensile strength direction. at room temperature is greater than or equal to 250%. According to another aspect, there is provided a method of manufacturing a porous separator including forming an extruded sheet by extrusion, by means of an extruder, of a mixture of a polymer and an elastic material in a weight ratio of 95°C. :5 to 60:40, forming a film by annealing and stretching the extruded sheet and forming a porous separator by thermosetting the stretched film. Consequently, a thermal shrinkage ratio of the film is reduced and an elongation at break is greatly (...). |