Multilayer porous film, separator for batteries, and battery

一种多孔膜、叠层的技术，应用在锂离子二次电池用隔板领域，能够解决无法充分发挥出切断功能、两极间短路、膜破裂等问题，达到抑制透气性恶化、抑制填料脱落、粘结力增强的效果

Active Publication Date: 2013-02-06
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 lithium-ion secondary batteries, the normal cut-off function cannot be fully exhibited. The thermal shrinkage of the separator causes the film to rupture, which leads to a short circuit between the two poles, resulting in a fire accident

Method used

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  • Multilayer porous film, separator for batteries, and battery
  • Multilayer porous film, separator for batteries, and battery
  • Multilayer porous film, separator for batteries, and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0251] Alumina (manufactured by Sumitomo Chemical Co., Ltd., Sumicorundum AA-03, average particle size: 0.3 μm, density: 3.9 g / cm 3 ) 19.7 parts by mass, polyvinyl alcohol (manufactured by Kuraray, PVA124, degree of saponification: 98.0 to 99.0, average degree of polymerization: 2400, density: 1.3 g / cm 3 ) was dispersed in 80.0 parts by mass of water to obtain a dispersion liquid. At this time, the solid content rate in the dispersion liquid was 20 mass % with respect to 100 mass % of the dispersion liquid.

[0252] Using a bar coater with an amount of #20, the obtained dispersion is coated on one side of the polyolefin resin porous film (layer 1) as the two three-layer base material layers of the above-mentioned A layer / B layer / A layer. solution, and then dried at 20°C for 30 minutes while allowing the filler to settle to form a coating layer (layer II), and a laminated porous film consisting of a polyolefin resin porous film (layer I)-coating layer (layer II) was fabricated...

Embodiment 2

[0254] Alumina (manufactured by Nippon Light Metal Co., Ltd., low-sodium alumina LS-235C, average particle size: 0.5 μm, density: 3.9 g / cm 3 ) 19.7 parts by mass, polyvinyl alcohol (manufactured by Kuraray, PVA124, degree of saponification: 98.0 to 99.0, average degree of polymerization: 2400, density: 1.3 g / cm 3 ) was dispersed in 80.0 parts by mass of water to obtain a dispersion X. Next, alumina was replaced with spherical alumina ASFP-20 (average particle size: 0.2 μm, density: 3.9 g / cm2) manufactured by Denki Kagaku Kogyo Co., Ltd. 3 ), except that, the dispersion liquid Y dispersed in polyvinyl alcohol and water was obtained in the same manner as the dispersion liquid X. At this time, the solid content ratios in the dispersion liquids X and Y were both 20% by mass relative to 100% by mass of the dispersion liquid.

[0255] Hydrochloric acid was added to the obtained dispersion liquid X to make it 0.7% by mass, and the above-mentioned two kinds of three-layer base mater...

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Abstract

The present invention is capable of providing a multilayer porous film which has high adhesion between a base layer and a coating layer and excellent heat resistance and exhibits excellent characteristics when used as a separator for a nonaqueous electrolyte secondary battery. A multilayer porous film which is obtained by laminating a coating layer that contains a filler and a resin binder on at least one surface of a polyolefin resin porous film that serves as a base layer. The ratio of the average particle diameter (Du) of the filler within 25% of the thickness of the coating layer from the surface of the multilayer porous film to the average particle diameter (Db) of the filler within 25% of the thickness of the coating layer from the interface with the base layer, namely, Du / Db is 1.2-10; and the average particle diameter (Du) is 0.5 [mu]m or less.

Description

technical field [0001] The present invention relates to a laminated porous film, which can be used as a packaging, hygiene, livestock, agricultural, construction, medical, separation membrane, light diffusion plate, battery separator, and is particularly preferably used as a separator for a non-aqueous electrolyte battery. Used as a separator for lithium-ion secondary batteries. 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. In particular, portable devices using lithium-ion secondary batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32C08J9/36H01M2/16H01M10/052C08J7/043H01M50/403H01M50/449
CPCC08J9/36H01M2/16C08L69/00H01M2/145B32B27/32H01M2/1686H01M10/052C08J7/042C08J2323/02Y10T428/249981Y10T428/249953Y02E60/10H01M50/403H01M50/449C08J7/043B32B27/08B32B5/18H01M50/431
Inventor 山田裕人根本友幸
Owner MITSUBISHI CHEM CORP
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