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Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, used in secondary battery parts, battery pack parts, coatings, etc., can solve problems such as short circuit between two poles, separator membrane rupture, fire, etc. Excellent properties, the effect of excellent heat resistance

Active Publication Date: 2013-01-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in recent years, with the increase in energy density and power of LIB, the normal cut-off function cannot be fully exhibited, and when the temperature inside the battery exceeds about 150°C, which is the melting point of PE, and rises further, the separator will be heated. Shrinkage causes membrane rupture, which leads to a short circuit between the two poles, and even a fire accident

Method used

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  • Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery
  • Laminated porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0244] Alumina (manufactured by Sumitomo Chemical Co., Ltd., Sumicorundum AA-03, average particle diameter: 0.3 μm) 39.4 parts by mass, polyvinyl alcohol (manufactured by Kuraray, PVA124, degree of saponification: 98.0 to 99.0, average degree of polymerization: 2400) 0.6 The mass parts were dispersed in 60.0 mass parts of water to obtain a dispersion liquid. Then, 0.003 parts by mass of polyethyleneimine (manufactured by Junsei Chemical Co., Ltd., polyethyleneimine 10000, molecular weight: about 10000) was dispersed in the dispersion liquid to obtain a dispersion liquid. At this time, the content rate of the adhesive agent (c) contained in a dispersion liquid was 0.05 mass % with respect to 100 mass % of resin binders (b).

[0245] The obtained dispersion liquid was coated on the laminated porous film obtained by the above-mentioned method for producing a polyolefin resin porous film with a gravure coater, and then dried at 60°C.

[0246] The physical properties of the obtain...

Embodiment 2

[0248] Alumina (manufactured by Sumitomo Chemical Co., Ltd., Sumicorundum AA-03, average particle diameter: 0.3 μm) 39.4 parts by mass, polyvinyl alcohol (manufactured by Kuraray, PVA124, degree of saponification: 98.0 to 99.0, average degree of polymerization: 2400) 0.6 The mass parts were dispersed in 60.0 mass parts of water to obtain a dispersion liquid. Then, 0.018 parts by mass of polyethyleneimine (manufactured by Junsei Chemical Co., Ltd., polyethyleneimine 10000, molecular weight: about 10000) was dispersed in the dispersion liquid to obtain a dispersion liquid. At this time, the content rate of the adhesive agent (c) contained in a dispersion liquid was 3 mass % with respect to 100 mass % of resin binders (b).

[0249] The obtained dispersion liquid was coated on the laminated porous film obtained by the above-mentioned method for producing a polyolefin resin porous film with a gravure coater, and then dried at 60°C.

[0250] The physical properties of the obtained ...

Embodiment 3

[0252]Alumina (manufactured by Sumitomo Chemical Co., Ltd., Sumicorundum AA-03, average particle diameter: 0.3 μm) 39.4 parts by mass, polyvinyl alcohol (manufactured by Kuraray, PVA124, degree of saponification: 98.0 to 99.0, average degree of polymerization: 2400) 0.6 The mass parts were dispersed in 60.0 mass parts of water to obtain a dispersion liquid. Then, 0.06 parts by mass of polyethyleneimine (manufactured by Junsei Chemical Co., Ltd., polyethyleneimine 10000, molecular weight: about 10000) was dispersed in the dispersion liquid to obtain a dispersion liquid. At this time, the content rate of the adhesive agent (c) contained in a dispersion liquid was 10 mass % with respect to 100 mass % of resin binders (b).

[0253] The obtained dispersion liquid was coated on the laminated porous film obtained by the above-mentioned method for producing a polyolefin resin porous film with a gravure coater, and then dried at 60°C.

[0254] The physical properties of the obtained l...

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Abstract

The purpose of the present invention is to provide a laminated porous film in which the adhesion between a polyolefin resin porous film that serves as a base film and a coating layer is high, and which has heat resistance and can exhibit excellent properties when used as a separator for a non-aqueous electrolyte secondary battery. The present invention provides a laminated porous film characterized in that a coating layer (a layer II) containing a filler (a), a resin binder (b) and an adhesive agent (c) is laminated on at least one surface of a polyolefin resin porous film (a layer I).

Description

technical field [0001] The present invention relates to a laminated porous film, which can be used as packaging, sanitary, livestock, agricultural, construction, medical, separation membrane, light diffusion plate, and battery separator, and is particularly preferably used as a non-aqueous electrolyte battery. Partition use. Background technique [0002] Porous polymers with many fine interconnected pores have been used in separation membranes used in the preparation of ultrapure water, purification of chemical solutions, water treatment, etc., waterproof and moisture-permeable membranes used in clothing / sanitary materials, or batteries, etc. Used in various fields such as battery separators. [0003] In particular, secondary batteries have been widely used as power sources for portable devices such as OAs, FAs, home appliances, and communication devices. Among them, since the volumetric efficiency is good when mounted in a device, and the size and weight of the device can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B5/18B32B27/20C08J9/36H01M2/16C08J7/043H01M50/434H01M50/451H01M50/489H01M50/491
CPCY02E60/12B32B2457/10B32B27/32B32B2255/10H01M2/1646B32B27/08B32B2250/242C08J2323/02C08J7/047B32B2255/26H01M2/1686H01M2/166C08J7/0427Y02E60/10H01M50/446H01M50/491H01M50/489H01M50/451H01M50/434B32B27/18B32B5/18H01M10/02
Inventor 高木义人根本友幸
Owner MITSUBISHI CHEM CORP