Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF8 Cites 12 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com