Nippon Kodoshi Corporation

Dupont Safety & Construction, Inc.

Takumi Ichimura

Norihiro Wada

Atsushi Igawa

Gaku Matsuoka

Naoki Fujimoto

Yuhei Nishimori

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.

Separator for electrochemical elements, and electrochemical element

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 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 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:

Separator for power storage device and power storage device using the separator

A separator for an electric double-layer capacitor is provided having a double-layer structure made of a fibrous layer A obtained by papermaking using a Fourdrinier net or a tanmo net, and a fibrous layer B obtained by papermaking using a cylinder net. The fibrous layer A is a layer that is refined until a CSF value decreases once to 0 ml (lower limit), and further refined until it turns to rise to 10 to 600 ml, the fibrous layer B is a layer that is refined until a CSF value of 700 to 0 ml, and the fibrous layer A and the fibrous layer B contain 70% by mass or more refinable, regenerated cellulose fibers. The density of the entire double-layer structure is 0.25 to 0.65 g/cm, and the thickness of the same is 10 to 150 &#x3bc;m. This allows provision of a separator for an electric double-layer capacitor having excellent tensile strength and tear strength, provision of a degree of mechanical strength such that the separator does not break in a manufacturing process of a wound or a stacked type electric double-layer capacitor, and improvement of productivity without adversely affecting internal resistance and leakage current properties of the capacitor as an energy storage device.

Growing community of inventors

Kochi, Japan

Takumi Ichimura