Patent ID: 8062387

Claim:
A method of producing a battery which comprises: obtaining an electrode/reactive polymer-supporting porous film layered body by layering electrodes on a reactive polymer-supporting porous film, wherein the reactive polymer-supporting porous film comprises a porous substrate film and a reactive polymer partially crosslinked and supported on the porous substrate film, the reactive polymer being obtained by the reaction of a crosslinkable polymer having at least one reactive group selected from the group consisting of 3-oxetanyl group and epoxy group in the molecule with a polycarboxylic acid; placing the electrode/reactive polymer-supporting porous film layered body in a battery container; and introducing an electrolytic solution containing a cationic polymerization catalyst into the battery container so that at least a portion of the reactive polymer is swelled or dissolved in the electrolytic solution at least in the vicinity of the interface of the porous film and the electrodes, and is cationic-polymerized thereby gelling at least a portion of the electrolytic solution so that the electrodes are bonded to the porous film.