METHOD FOR PRODUCING POROUS FILM

PROBLEM TO BE SOLVED: To provide a method for producing a porous film having high mechanical strength, large specific surface area and large pore volume and excellent in ion permeability and high-speed electric charge/discharge characteristics. SOLUTION: This method for producing a porous film compr...

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Bibliographische Detailangaben
Hauptverfasser:	OIZUMI SHINICHI, ICHIKAWA TOMOAKI
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 method for producing a porous film having high mechanical strength, large specific surface area and large pore volume and excellent in ion permeability and high-speed electric charge/discharge characteristics. SOLUTION: This method for producing a porous film comprises the following process: a resin composition comprising a polyolefin resin and a solvent is kneaded under melting, the resulting kneaded product is formed into a sheet, which, in turn, is rolled out and subjected to solvent elimination treatment; wherein the solvent elimination treatment is characterized by being made by fixing both ends in the cross direction of the sheet-like formed product followed by drying it with both the ends thereof left fixed. Batteries having the above porous films are also provided.