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Separator for power storage device

A technology for electric storage devices and separators, applied in the direction of hybrid capacitor separators, circuits, capacitors, etc., can solve problems such as difficult to achieve thin film, can not meet high functionality, internal resistance rise, etc., and achieve the effect of good characteristics

Active Publication Date: 2010-12-22
TOMOEGAWA PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polyethylene terephthalate or polybutylene phthalate is used in the base material, the base material itself has the property of being easy to melt in the melting temperature range. When polyamide or polyphenylene sulfide is used, it is difficult to achieve thin film, and the ion conductivity decreases with the increase of internal resistance
Therefore, the requirements for high functionality cannot be met

Method used

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  • Separator for power storage device
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  • Separator for power storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A sheet-shaped stretched porous film layer made of high-density polyethylene with a porosity of 55%, a thickness of 16 μm, a length of 257 mm, and a width of 182 mm was prepared. In addition, the stretched porous film layer made of high-density polyethylene is produced by melting and extruding high-density polyethylene with a T-shaped compression die to produce a polyethylene film, and then heat-treating the film in a hot air circulation oven. , and then the stretched film layer is carried out between nip rolls. An acetone solution with a mass percent of SBR (styrene-butadiene rubber) of 3% was coated on the porous membrane layer by spraying. Next, on the coated surface, a solvent-spun cellulose fibrillated to a fiber diameter of 0.5 μm and a fiber length of 1 mm was laminated with a thickness of 10 μm and a density of 0.52 g / cm. 3 1. Dry the flaky fibrous layer with an air permeability of 8 seconds / 100ml at 60° C. for 2 minutes with a Yankee drier to obtain the spacer...

Embodiment 2

[0081] A separator of the present invention was obtained in the same manner as in Example 1, except that a stretched porous film made of high-density polyethylene with a porosity of 60% and a thickness of 12 μm was used for the porous film layer. In addition, in the above separator, the volume of the resin portion of the polyolefin porous film layer is 0.22 cm 3 .

Embodiment 3

[0083] A separator of the present invention was obtained in the same manner as in Example 1, except that a stretched porous film made of high-density polypropylene with a porosity of 55% and a thickness of 16 μm was used for the porous film layer. In addition, in the above separator, the volume of the resin portion of the polyolefin porous film layer was 0.34 cm 3 .

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Abstract

This invention is relates to a separator of a power storage device which is a laminate of a polyolefin porous membrane layer and a fiber layer comprising a solvent spun cellulose; and a separator of a power storage device, wherein the separator is a laminate of a polyolefin porous membrane layer and a fiber layer comprising a solvent spun cellulose, and the volume of a cavity part of the fiber layer is smaller than the volume of a resin part of the polyolefin porous membrane layer.

Description

technical field [0001] The present invention relates to a separator (hereinafter referred to as "separator") for electrical storage devices such as lithium ion secondary batteries, lithium ion capacitors, and electric double layer capacitors. Background technique [0002] Electric storage devices such as lithium-ion secondary batteries, lithium-ion capacitors, and electric double-layer capacitors include a pair of electrodes and separators, which are impregnated with an electrolyte solution for driving the storage device, and are used in various industrial and civilian applications. of electrical and electronic equipment. [0003] In order to improve the performance of electrical and electronic equipment, it is essential to increase the capacity and functionality of electrical devices, and therefore, improved separators are required. For example, in order to cope with higher capacity of power storage devices, separators having heat resistance, mechanical strength, and dimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02H01G9/155H01M2/16H01M10/0525H01M50/454H01M50/489
CPCH01M12/005Y02E60/13H01M2/1666H01G9/155H01G9/02Y02E60/10H01G11/52H01M50/489H01M50/454
Inventor 桥本武司户塚博己高畑正则高梨光吉太田泰广佐野一彦
Owner TOMOEGAWA PAPER CO LTD