Abstract: A resistance to short-circuiting of a separator to be used in an aluminum electrolytic capacitor having a conductive polymer is improved. A separator for an aluminum electrolytic capacitor, that is interposed between a pair of electrodes and is used in an aluminum electrolytic capacitor having a conductive polymer as a cathode material, is configured to include synthetic fibers and a binder and to have a bursting strength of 40-180 kPa and a burst index of 3.5-7.5 kPa/(g/m2).

Abstract: A separator for aluminum electrolytic capacitors, the separator being interposed between a pair of electrodes in an aluminum electrolytic capacitor that includes a conductive polymer as a cathode material, where: the separator is composed of fibrillated cellulose fibers and fibrillated synthetic fibers; and a tensile strength decrease rate as expressed by formula (1) with use of a tensile strength after 30-minute humidity control at 20° C. at 65% RH and a tensile strength after 20-minute heat treatment at 270° C. is from 10% to 90%: (X1?X2)/X1×100??Formula (1): X1: Tensile strength after 30-minute humidity control at 20° C. at 65% RH X2: Tensile strength after 20-minute heat treatment at 270° C.

Abstract: The purpose of the present invention is to provide an electrochemical element that can withstand prolonged use, with little damage or degradation due to the pressure of hydrogen gas generated, even when used for prolonged periods of time. This electrochemical element is equipped with a hydrogen-releasing film and has a laminated body in which an anode and a cathode are laminated with a separator interposed therebetween. The hydrogen-releasing film contains a metal layer, the separator contains pulp, and the total sulfur component content in the separator is 400 ppm or less as determined by quartz tube combustion gas absorption ion chromatography.

Abstract: Provided is an electrochemical device separator that can reduce the amount of gas produced within a casing and can suppress an increase in pressure after said electrochemical device has been manufactured. The electrochemical device separator, which is interposed between a pair of electrodes and is capable of retaining an electrolytic solution containing an electrolyte, is configured such that the total chlorine content according to quartz tube combustion gas absorption ion chromatography is 10 ppm or less, the total sulfur content according to the abovementioned ion chromatography is 100 ppm or less, and the R18 value according to TAPPI T 235 cm-09 is 90% or higher.

Abstract: The purpose of the present invention is to provide an electrochemical element that can withstand prolonged use, with little damage or degradation due to the pressure of hydrogen gas generated, even when used for prolonged periods of time. This electrochemical element is equipped with a hydrogen-releasing film and has a laminated body in which an anode and a cathode are laminated with a separator interposed therebetween. The hydrogen-releasing film contains a metal layer, the separator contains pulp, and the total sulfur component content in the separator is 400 ppm or less as determined by quartz tube combustion gas absorption ion chromatography.