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Separator for electricity storage devices and electricity storage device using said separator

A technology for electrical storage devices and separators, applied in electrical components, electrolytic capacitors, battery pack components, etc., can solve problems such as resistance value deterioration, and achieve the effect of reducing internal resistance value, excellent resistance performance, and improving yield

Inactive Publication Date: 2017-12-01
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, when the thickness of the separator is increased and the density is increased, the resistance value deteriorates

Method used

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  • Separator for electricity storage devices and electricity storage device using said separator
  • Separator for electricity storage devices and electricity storage device using said separator
  • Separator for electricity storage devices and electricity storage device using said separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] Using the following papermaking raw materials, the fourdrinier papermaking method was used to obtain a thickness of 20.0μm and a density of 0.450g / cm 3 , Tear index 15mN·m 2 / g separator, the papermaking raw material is 20% by mass of rich and strong fibers of regenerated cellulose fibers with a CSF value of 0 ml as fiber A, and the CSF value as fiber B is temporarily reduced to 0 ml (lower limit value) and then further beaten It is made by compounding 80% by mass of rich and strong fiber of regenerated cellulose fiber with increased CSF value 1ml. The separator had a CSF value of 0 ml.

[0191] Using this separator, a laminated electric double layer capacitor having a rated voltage of 2.5 V, a capacity of 3000 F, and a cell size of 55 mm×55 mm×155 mm was produced as the electric double layer capacitor of Example 1.

Embodiment 2

[0193] Using the following papermaking raw materials, the fourdrinier papermaking method was used to obtain a thickness of 10.0 μm and a density of 0.320 g / cm 3 , Tear index 14mN·m 2 / g separator, the papermaking raw material is 20% by mass of lyocell fibers of regenerated cellulose fibers having a CSF value of 0 ml as fiber A and temporarily reducing the CSF value of fiber B to 0 ml (lower limit value) 80 mass % of lyocell fibers converted into 500 ml of regenerated cellulose fibers with an increased CSF value by further beating were blended. The separator has a CSF value of 10 ml.

[0194] Using this separator, a laminated electric double layer capacitor having a rated voltage of 2.5 V, a capacity of 3000 F, and a cell size of 55 mm×55 mm×155 mm was produced as the electric double layer capacitor of Example 2.

Embodiment 3

[0196] A sheet was obtained by fourdrinier papermaking using the following papermaking raw materials: 60% by mass of regenerated cellulose fiber lyocell as fiber A having a CSF value of 350 ml, and CSF as fiber B The value was once lowered to 0 ml (lower limit value), and further beating was carried out, and 40% by mass of lyocell fibers were blended into regenerated cellulose fibers with an increased CSF value of 500 ml. Next, the sheet was calendered to obtain a thickness of 18.0 μm and a density of 0.667 g / cm 3 , Tear index 38mN·m 2 / g separator. The separator had a CSF value of 0 ml.

[0197] Using this separator, a laminated electric double layer capacitor having a rated voltage of 2.5 V, a capacity of 3000 F, and a cell size of 55 mm×55 mm×155 mm was fabricated as the electric double layer capacitor of Example 3.

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Abstract

Provided are: a separator for electricity storage devices, which has excellent tear strength, compactness and resistive properties; and an electricity storage device which is provided with this separator for electricity storage devices. A separator for electricity storage devices is configured from regenerated cellulose fibers, which are able to be fibrillated by beating, so that the CSF value X (ml) and the relative tear strength Y (mN-m2 / g) are within the ranges that satisfy the formulae shown below. In addition, an electricity storage device, in which a separator is interposed between a pair of electrodes, is configured using this separator for electricity storage devices. 0 <= X <= 150 Formula 1 10 <= Y <= 70 Formula 2 Y >= 0.3X-5 Formula 3.

Description

technical field [0001] The present invention relates to a separator for an electrical storage device and an electrical storage device using the same. Furthermore, the present invention is suitably used for, for example, separators for electrical storage devices such as electric double layer capacitors, lithium ion capacitors, and lithium ion secondary batteries, and electrical storage devices. Background technique [0002] Electric storage devices, such as electric double-layer capacitors, are capacitors that utilize the electric double-layer phenomenon, and are generally composed of a pair of polarized electrodes facing each other, a separator that electrically and physically separates the pair of polarized electrodes, and an organic electrolyte. The electric double layer phenomenon is a phenomenon in which opposite charges are accumulated at the interface between the surface of the polarized electrode and the electrolyte when the polarizable electrode is brought into conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/52H01G9/02H01M2/16H01M50/489
CPCH01G9/02H01G11/52H01G11/06H01G11/58Y02E60/10H01M50/489Y02E60/13H01M50/409H01M50/463H01M10/0525
Inventor 井河笃和田典弘市村拓己
Owner NIPPON KODOSHI
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