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Separator for lithium ion secondary battery and lithium ion secondary battery

A secondary battery and lithium ion technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of difficult to form electrode/separator interface, difficult to form holes continuously, impractical, etc.

Inactive Publication Date: 2010-05-19
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to form a proper electrode / separator interface with such a significant difference between the surface and the interior of the separator, and there are problems in battery performance, which is not practical
Also, due to curl, there is a problem with poor performance using
In addition, para-aramid polymers also have problems such as difficulty in coating adjustment and molding
Specifically, it is difficult to form pores continuously, and only very small pores can be formed, so sufficient ion permeability cannot be obtained
In addition, this technology also has the problem of complicated manufacturing methods

Method used

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  • Separator for lithium ion secondary battery and lithium ion secondary battery
  • Separator for lithium ion secondary battery and lithium ion secondary battery
  • Separator for lithium ion secondary battery and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] PET staple fibers with a fineness of 0.11dtex (average fiber diameter about 3.2μm) were bonded with PET staple fibers with a fineness of 0.33dtex (average fiber diameter about 5.5μm) and PET staple fibers with a fineness of 0.22dtex (average fiber diameter about 4.5μm). Mixture with PET staple fiber, blending with the weight ratio of 3 / 2 / 5, by wet papermaking method with a basis weight of 12.6g / m 2 A film was formed and calendered at 140° C. to obtain a PET nonwoven fabric with a film thickness of 18 μm.

[0085] Polym-phenylene isophthalamide (manufactured by Teijin Technology Corporation, trade name "Conex") was dissolved in a mixed solvent of dimethylacetamide:tripropylene glycol=85:15 (weight ratio) The concentration was 9% by weight, and a polymer solution was prepared. Apply the polymer solution to both sides of the PET nonwoven fabric, and immerse the coated material in a 30° C. coagulation bath composed of dimethylacetamide:water=55:45 (weight ratio) for 60 sec...

Embodiment 2

[0088] Use polym-phenylene isophthalamide short fibers with a fineness of 0.9dtex (average fiber diameter about 10μm), and use a dry method with a basis weight of 15.0g / m 2 A film was formed and calendered at 320° C. to obtain a nonwoven fabric with a film thickness of 30 μm.

[0089]Using this nonwoven fabric and the same polymer solution as in Example 1, the separator for lithium ion secondary batteries of the present invention was obtained in the same manner. This separator is referred to as the separator 2 of the present invention. The film thickness of the separator 2 of the present invention is 34 μm, and the basis weight is 18.1 g / m 2 , Gurley value (JIS P8117) is 35 seconds / 100cc.

Embodiment 3

[0102] Lithium cobaltate (LiCoO 2 ; Nippon Chemical Industry Co., Ltd.) powder 89.5 parts by weight, 4.5 parts by weight of acetylene black and 6 parts by weight of polyvinylidene fluoride were kneaded to prepare a slurry. The obtained slurry was coated on an aluminum foil with a thickness of 20 μm, dried and then pressed to obtain a positive electrode with a thickness of 100 μm.

[0103] A slurry was prepared by kneading 87 parts by weight of mesocarbon microspheres (MCMB: manufactured by Osaka Gas Chemical Co., Ltd.) powder, 3 parts by weight of acetylene black, and 10 parts by weight of polyvinylidene fluoride using N-methyl-2-pyrrolidone solvent. . The obtained slurry was coated on a copper foil having a thickness of 18 μm, dried and then pressed to obtain a negative electrode of 90 μm.

[0104] The above-mentioned positive electrode and negative electrode were opposed to each other with the separator 1 of the present invention produced in Example 1 interposed therebetwe...

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Abstract

Disclosed is a membrane as a separator for lithium ion secondary batteries wherein a porous layer mainly composed of an aromatic polyamide is formed on both sides of a nonwoven fabric. This separatorhas sufficiently high heat resistance and good handling properties, and is an effective measure against overcharging. Safety of a lithium ion secondary battery can be improved by using such a separator.

Description

technical field [0001] The present invention relates to separators used in lithium ion secondary batteries. In particular, it relates to separator technology for the purpose of improving the safety of lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries, which obtain electromotive force through intercalation and deintercalation of lithium ions, have high energy density and are widely used as batteries for portable electronic devices such as mobile phones and notebook computers. In addition, it has also begun to be applied to power sources such as electric tools with increased power. [0003] In recent years, attention to hybrid electric vehicles (HEV) has increased due to global environmental problems. Currently, nickel-metal hydride batteries are generally used as batteries, but lithium-ion secondary batteries have no memory effect compared to nickel-hydrogen batteries, so they are easier to use. , Since it has the advantages of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/40H01M4/131H01M4/133H01M10/0525H01M10/36H01M50/414H01M50/454H01M50/457H01M50/489H01M50/491
CPCH01M4/133Y02E60/122Y02T10/7011H01M4/131H01M2/1666H01M10/0525H01M10/4235H01M2/1653Y02E60/10H01M50/457H01M50/454H01M50/491H01M50/414H01M50/489H01M50/423H01M50/449H01M50/463H01M50/411H01M50/443H01M50/434H01M50/403Y02P70/50
Inventor 西川聪本元博行大道高弘佐野弘树
Owner TEIJIN LTD
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