Nippon Kodoshi Corporation

Atsushi Igawa

Norihiro Wada

Takumi Ichimura

Kosuke Tanaka

Gaku Matsuoka

Naoki Fujimoto

Masahiko Ueta

Ai Morikawa

Akiyoshi Takeuchi

Yuhei Nishimori

Kazuyuki Sakamoto

A separator for electrochemical elements is formed of beaten regenerated cellulose fibers and capable of withstanding a common element winding process for an aluminum electrolytic capacitor, while having denseness and low impedance characteristics. The separator is interposed between a pair of electrodes, while capable of holding an electrolyte solution that contains an electrolyte, is configured from a single layer so as to have a thickness of 10 to 35 μm, a density of 0.35 to 0.80 g/cm, a tensile strength of 9.8 N/15 mm or more, an average pore diameter of 0.05 to 1.00 μm, and a modified tensile strength of 5.9 N/15 mm or more, if the value of a tensile strength as measured by setting the distance between holders of a tensile testing machine to 0.1 mm and the elongation rate of a test piece to 200 mm/min is defined as the modified tensile strength.

Separator for electrochemical elements, and electrochemical element

A separator for an aluminum electrolytic capacitor. The separator makes it possible to use inexpensive fibers and has excellent impedance characteristics and short-circuit resistance performance. When the separator for an aluminum electrolytic capacitor is interposed between a positive electrode and a negative electrode of an aluminum electrolytic capacitor and 500 V are applied during separator dielectric breakdown testing, the separator for an aluminum electrolytic capacitor has a short-circuit rate of no more than 10%.

Separator for aluminum electrolytic capacitor, and aluminum electrolytic capacitor

A heat-resistant separator for an electrochemical element in which the thickness of the separator is reduced while maintaining the balance between the short circuit resistance, resistance, electrolyte impregnation performance, and electrolyte retention performance of the separator. A separator for an electrochemical element includes beaten cellulose fibers, wherein the value obtained by dividing the average value for the distance between the center point of a cellulose stem fiber constituting part of the separator and the center point of another cellulose stem fiber nearest to said cellulose stem fiber by the thickness of the separator is 0.80 to 1.35.

Separator for electrochemical element and electrochemical element

A thin separator for electrochemical elements, which has achieved chemical stability, while maintaining a good balance among short-circuit resistance, resistivity, electrolyte solution impregnability and electrolyte solution retainability of the separator. A separator for electrochemical elements, which is interposed between a pair of electrodes so as to separate the electrodes from each other, and which holds an electrolyte solution. This separator for electrochemical elements is composed of beaten cellulose fibers and thermoplastic synthetic fibers, and has a thickness of 5.0-30.0 &#x3bc;m and a density of 0.50-0.75 g/cm; and the thickness X (&#x3bc;m) and the air resistance Y (second/100 ml) of this separator for electrochemical elements satisfy formula 1:&#x2265;0.01&#x2212;0.6+11.5.

A separator for an electrochemical element suitable extends the service life of an electrochemical element under high temperature conditions. This separator for an electrochemical element is disposed between a pair of electrodes and is for separating the two electrodes from each other and retaining an electrolytic solution, wherein the separator contains a cellulose-based fiber, and the limiting viscosity of the separator as measured by the measurement method specified in JIS P 8215 is in a range of 150-500 ml/g.

Provided is a separator for an electrochemical element having exceptional strength and shielding performance, a small thickness, and low resistance. A separator for an electrochemical element interposed between a pair of electrodes and capable of holding an electrolytic solution containing an electrolyte, wherein the separator for an electrochemical element comprises a regenerated cellulose fiber having an average fiber length of 0.25-0.80 mm and an average fiber width of 3-35 &#x3bc;m, and in which the value calculated by dividing the average fiber length by the average fiber width is 15-70.

Provided is a separator for aluminum electrolytic capacitors, in which the separator has both good short circuit resistance and good impedance characteristics. A separator for aluminum electrolytic capacitors is formed, in which the separator is interposed between a positive electrode and a negative electrode of an aluminum electrolytic capacitor, and the separator includes at least one layer that is formed from plant fibers and has a dielectric breakdown strength of greater than or equal to 20 kV/mm.

Separator for aluminum electrolytic capacitors, and aluminum electrolytic capacitor

A separator for an electrochemical element interposed between a pair of electrodes, capable of holding an organic electrolytic solution contains an electrolyte. The separator is a wet-laid nonwoven fabric containing 10-50 mass % of thermoplastic synthetic fibers and 50-90 mass % of beaten regenerated cellulose fibers having a mean fiber length of 0.2-2.0 mm, the separator has a thickness of 10-70 &#x3bc;m and a density of 0.25-0.90 g/cm3, including two parts obtained by bisecting a cross-section of the separator in a thickness direction. Two A-parts with a small number of the thermoplastic synthetic fibers and B-part with a large number of the thermoplastic synthetic fibers, and the A and B parts are formed into a single layer in an integrated manner; a value obtained by dividing the number of thermoplastic synthetic fibers in the A part by the number of the thermoplastic synthetic fibers in the B part is 0.85 or less.

Separator for electrochemical element, electrochemical element, automobile, and electronic device

Provided is a separator for an electrochemical device, the separator having excellent denseness, resistance, and wettability by electrolytic solutions. A separator for an electrochemical device, the separator being interposed between a pair of electrodes and being capable of holding an electrolytic solution containing an electrolyte, wherein the separator for an electrochemical device comprises solvent-spun regenerated cellulose fibers in which the core portion has an average fiber diameter of 1-11 &#x3bc;m, the separator having a thickness of from 5 to 100 &#x3bc;m, a density of from 0.25 to 0.9 g/cm, and a curvature rate of from 1.5 to 15.

Separator for electrochemical device and electrochemical device

Provided is a separator having excellent tearing strength, denseness, and impedance performance, and an aluminum electrolytic capacitor provided with the separator. The present invention constitutes a separator including beatable regenerated cellulose fibers, the separator having a CSF value X[ml] and tear index Y[mN&#xb7;m/g] within the ranges satisfying the following formulae. The present invention also constitutes an aluminum electrolytic capacitor in which at least one of the separators is used, the capacitor feeing formed by interposing the separator between an anode and a cathode.&#x2264;X&#x2264;&#x2003;&#x2003;Formula&#x2264;Y&#x2264;&#x2003;&#x2003;Formula&#x2003;&#x2003;Formula

Separator and aluminum electrolytic capacitor

Provided is a separator for an electrochemical element, the separator having improved tensile strength and short-circuit resistance while maintaining the impedance characteristics and denseness expected of a separator comprising highly beaten regenerated cellulose fibers. The separator for an electrochemical element is interposed between a pair of electrodes and capable of holding an electrolytic solution containing an electrolyte, the separator for an electrochemical element comprising: 20 to 80 mass % of natural cellulose fibers A in which the length weighted average fiber length is 0.30 to 1.19 mm and the CSF is 500 to 50 ml; 10 to 50 mass % of natural cellulose fibers B in which the length weighted average fiber length and the maximum distribution fiber length are 1.20 to 1.99 mm and the CSF is 500 to 50 ml; and 10 to 50 mass % of beaten regenerated cellulose fibers.

Provided is a separator for power storage device having excellent tearing strength, denseness, and resistance performance, and a power storage device provided with the separator for power storage device. The present invention constitutes a separator for power storage device including beatable regenerated cellulose fibers, wherein a CSF value X [ml] and a tear index Y [mN&#xb7;m/g] are within the ranges satisfying the following Formulae. The present invention also constitutes a power storage device in which the separator for power storage device is used, and which is formed by interposing the separator between one pair of electrodes.0&#x2264;&#x2264;150&#x2003;&#x2003;Formula 1:10&#x2264;&#x2264;70&#x2003;&#x2003;Formula 2:&#x2265;0.3&#x2212;5&#x2003;&#x2003;Formula 3:

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Kochi, Japan

Atsushi Igawa