MICROPOROUS FILM AND BATTERY SEPARATOR

PROBLEM TO BE SOLVED: To prepare a microporous film whose electric resistance varies with a temperature and to provide a secondary battery separator that exhibits, especially, a shutdown function in such a manner that, as the temperature rises, the electric resistance rises in two stages from a rela...

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Bibliographische Detailangaben
Hauptverfasser:	UETANI YOSHIHIRO, NOMI TOSHISUKE, YAMAMOTO KAZUNARI, ICHIKAWA TOMOAKI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELECTRICITY GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prepare a microporous film whose electric resistance varies with a temperature and to provide a secondary battery separator that exhibits, especially, a shutdown function in such a manner that, as the temperature rises, the electric resistance rises in two stages from a relatively low temperature and is therefore safer than a conventional separator. SOLUTION: The microporous film is characterized in that, when its electric resistance is measured while its temperature is raised at a rate of 10 deg.C/min after being impregnated with an electrolyte solution, it requires a temperature rise of at least 10 deg.C upon an increase in its electric resistance from 1.5R to 10R (wherein R is the electric resistance at 100 deg.C), and the electric resistance increases from 10R to 100R upon a further temperature rise within 5 deg.C.