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Porous film and electricity storage device

A technology of porous membrane and power storage device, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of poor battery heating safety, and achieve excellent battery characteristics, processability, and excellent liquid absorption.

Inactive Publication Date: 2012-09-12
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For non-aqueous solvent batteries such as lithium batteries and lithium-ion batteries, the electrolyte used is an organic solvent, which has the problem of poor heat generation and safety for the battery compared to aqueous solution solvents for water-based batteries.

Method used

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  • Porous film and electricity storage device
  • Porous film and electricity storage device
  • Porous film and electricity storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0156] First, pellets of resins A and B were prepared by blending the following composition at 300° C. with a twin-screw extruder.

[0157]

[0158] 92 parts by mass of homopolypropylene FLX80E4 (hereinafter, PP-1) manufactured by Sumitomo Chemical Co., Ltd., 1 part by mass of polypropylene PF-814 (hereinafter, HMS-PP) manufactured by Basell as a high melt tension polypropylene resin, and ethylene In addition to 7 parts by mass of "Engage" (registered trademark) 8411 (melt index: 18 g / 10 minutes or less, PE) manufactured by Dow Chemical Co., Ltd. of 1-octene, N as a β crystal nucleating agent , 0.2 parts by mass of N'-dicyclohexyl-2,6-naphthalene dicarboxamide (Nu-100 manufactured by Shin Nippon Chemical Co., Ltd.), and 0.15 parts by mass of "IRGANOX" ( registered trademark) 1010, 0.1 parts by mass of "IRGAFOS" (registered trademark) 168

[0159]

[0160] 99 parts by mass of homopolypropylene PP-1, 1 part by mass of high melt tension polypropylene HMS-PP, N,N'-dicyclohexy...

Embodiment 2

[0166] Except changing the lamination thickness ratio to 1 / 5 / 1, the same operation as in Example 1 was carried out to obtain a porous film with a thickness of 25 μm. Each physical property value is shown in Table 1 and Table 2.

[0167] The resulting porous film had a high liquid absorption of 16.0 mm in the electrolyte liquid absorption height after 30 minutes in the width direction, an air resistance of 220 seconds / 100 ml, a porosity of 72%, and an excellent battery with an output characteristic of A It has a high strength of 74 MPa of breaking strength in the longitudinal direction, and is excellent in workability as A. In addition, layer A is a liquid-absorbing layer, and layer B is a strength-maintaining layer. The liquid-absorbing height of the electrolyte solution after 30 minutes in the width direction of layer A is 19.0 mm, and the breaking strength in the longitudinal direction is 52 MPa. The liquid absorption height of the electrolyte after 1 minute is 7.5 mm, and ...

Embodiment 3

[0169] Except changing the lamination thickness ratio to 1 / 10 / 1, the same operation as in Example 1 was carried out to obtain a porous film with a thickness of 25 μm. Each physical property value is shown in Table 1 and Table 2.

[0170] The resulting porous film had a high liquid absorbency of 14.5 mm in the electrolyte liquid absorption height after 30 minutes in the width direction, an air resistance of 250 seconds / 100 ml, a porosity of 69%, and an excellent battery with an output characteristic of A It has a high strength at breaking strength of 77 MPa in the longitudinal direction, and is excellent in workability as A. In addition, layer A is a liquid-absorbing layer, and layer B is a strength-maintaining layer. The liquid-absorbing height of the electrolyte after 30 minutes in the width direction of layer A is 18.0 mm, and the breaking strength in the longitudinal direction is 50 MPa. The thickness of layer B in the width direction is 30 mm. The liquid absorption height...

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Abstract

A porous film wherein the electrolytic solution absorption height in the lengthwise and / or widthwise direction of the film is 10 to 60mm as determined 30 minutes after the initiation of absorption of the electrolytic solution, and the breaking strength in the lengthwise direction is 65MPa or more. The porous film exhibits high absorptivity for an electrolytic solution. When used as a separator, the porous film ensures excellent cell characteristics and excellent cell fabrication.

Description

technical field [0001] The present invention relates to a porous membrane and an electrical storage device. More specifically, it relates to a porous film which can be suitably used as a separator for non-aqueous solvent batteries or capacitors, has excellent liquid absorption of electrolyte, and exhibits excellent battery characteristics and processability when used as a separator, and This porous film is used as a separator for an electrical storage device. Background technique [0002] In non-aqueous solvent batteries such as lithium batteries and lithium ion batteries, the electrolytic solution used is an organic solvent, which has a problem of being less safe for heat generation of the battery than aqueous solution solvents of aqueous batteries. Therefore, conventionally, in order to improve the safety of non-aqueous solvent batteries, especially lithium-ion batteries with high energy density, separators using microporous membranes made of olefin-based materials mainly...

Claims

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Application Information

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IPC IPC(8): C08J9/00H01G9/02H01M2/16H01M50/409H01M50/489H01M50/491H01M50/494
CPCC08J5/18C08J2323/02H01G9/02H01M10/0525H01M10/058Y10T428/249995Y02E60/10H01M50/409Y02P70/50H01M50/491H01M50/489H01M50/494C08L23/00Y02E60/13H01M50/417
Inventor 生驹启久万琢也大仓正寿
Owner TORAY IND INC
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