SEPARATOR FOR NONAQUEOUS ELECTROLYTE ELECTRICITY STORAGE DEVICES, NONAQUEOUS ELECTROLYTE ELECTRICITY STORAGE DEVICE, METHOD FOR PRODUCING SEPARATOR FOR NONAQUEOUS ELECTROLYTE ELECTRICITY STORAGE DEVICES, AND METHOD FOR MANUFACTURING NONAQUEOUS ELECTROLYTE ELECTRICITY STORAGE DEVICE

摘要

The purpose of the present invention is to provide a separator for nonaqueous electrolyte electricity storage devices, which uses an epoxy resin composition that is able to contribute to performance improvement of a nonaqueous electrolyte electricity storage device. A method for producing a separator for nonaqueous electrolyte electricity storage devices, said separator comprising an epoxy resin porous film having a film thickness within the range of 5-50 μm. This method for producing a separator for nonaqueous electrolyte electricity storage devices comprises: a porosity-imparting step wherein porogens are removed from an epoxy resin sheet, which contains a cured epoxy resin composition and the porogens, with use of a solvent, thereby making the epoxy resin sheet porous so that an epoxy resin porous film is obtained; and a treatment step wherein a solution containing 0.01-5.0 mol/L of an inorganic acid is brought into contact with the epoxy resin porous film or the epoxy resin sheet.