POLYOLEFIN MICROPOROUS MEMBRANE AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a polyolefin microporous membrane having a dense membrane structure and good permeation characteristics together with low shrinkage at a high temperature, making initial battery performance compatible with cycle performance, and suitable as a separator for a secondar...

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Bibliographische Detailangaben
Hauptverfasser:	HATAYAMA HIROSHI, KAWAZOE SHINYA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON 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 provide a polyolefin microporous membrane having a dense membrane structure and good permeation characteristics together with low shrinkage at a high temperature, making initial battery performance compatible with cycle performance, and suitable as a separator for a secondary battery such as lithium ion secondary battery excellent also in safety, and to provide a method for producing the membrane. SOLUTION: This polyolefin microporous membrane has water permeability/air permeability balance of 0.8×10-3-1.7×10-3and a bubble point of >0.5 MPa and