METHOD OF MANUFACTURING POROUS SEPARATOR COMPRISING ELASTIC MATERIAL, POROUS SEPARATOR MANUFACTURED BY THE METHOD, AND SECONDARY BATTERY COMPRISING THE SEPARATOR

Disclosed is a method of manufacturing a porous separator, 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...

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Bibliographische Detailangaben
Hauptverfasser:	SUNG, Dong-Wook, LEE, Joo-Sung, KIM, Jong-Hun, SHIN, Byoung-Jin
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BASIC ELECTRIC ELEMENTS ELECTRICITY INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Disclosed is a method of manufacturing a porous separator, 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 at a weight ratio of 40:60 to 5:95, and a value of elongation at break 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 extruding, through an extruder, a mixture of a polymer and an elastic material at a weight ratio of 95:5 to 60:40, forming a film by annealing and stretching the extruded sheet, and forming a porous separator by heat setting the stretched film. Accordingly, a thermal shrinkage ratio of the film is reduced and an elongation at break is greatly increased, to provide a porous separator with improved stability.