SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE SAME

PROBLEM TO BE SOLVED: To provide a separator for a nonaqueous electrolyte secondary battery excellent in mechanical properties such as piercing strength and preventing short circuits between electrodes, and a nonaqueous electrolyte secondary battery using the separator for a nonaqueous electrolyte s...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAJIMA SATOSHI, USAMI YASUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BASIC ELECTRIC ELEMENTS ELECTRICITY INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES 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:	PROBLEM TO BE SOLVED: To provide a separator for a nonaqueous electrolyte secondary battery excellent in mechanical properties such as piercing strength and preventing short circuits between electrodes, and a nonaqueous electrolyte secondary battery using the separator for a nonaqueous electrolyte secondary battery and achieving a high level of safety.SOLUTION: A separator for a nonaqueous electrolyte secondary battery is composed of a thermoplastic resin composite containing a thermoplastic resin and a filler, and has a piercing strength of 2.5 N or greater per thickness of 25 μm. The separator for a nonaqueous electrolyte secondary battery composed of the thermoplastic resin composite containing the thermoplastic resin and the filler is subjected to at least one drawing process at the melting point of the thermoplastic resin or a higher temperature, and then at least one drawing process at a temperature lower than the melting point in the direction of the drawing process at the melting point or the higher temperature. A nonaqueous electrolyte secondary battery comprises the separator for a nonaqueous electrolyte secondary battery.