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

Heat-Resistant Microporous Film And Battery Separator

一种电池、隔膜的技术，应用在耐热微孔膜领域，能够解决内部短路等问题，达到数量增加、维持耐热性的效果

Active Publication Date: 2016-05-18
MURATA MFG CO LTD
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shrinkage of the diaphragm causes secondary problems such as internal short circuits in some cases

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
  • Heat-Resistant Microporous Film And Battery Separator
  • Heat-Resistant Microporous Film And Battery Separator
  • Heat-Resistant Microporous Film And Battery Separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Polyvinylidene fluoride (PVdF) resin and N-methyl-2-pyrrolidone (NMP) each having a weight average molecular weight of 1,000,000 were mixed at a weight ratio of PVdF:NMP=10:90. Polyvinylidene fluoride was sufficiently dissolved in N-methyl-2-pyrrolidone, thereby preparing a polyvinylidene fluoride solution in which polyvinylidene fluoride was dissolved in an amount of 10% by weight.

[0109] A fine powder of alumina with an average particle size of 500 nm [Al 2 o 3 , Sumicorundum (registered trademark) AA-03, commercially available from Sumitomo Chemical Company, Limited] as an inorganic material was added to the polyvinylidene fluoride solution at 20 times the weight of polyvinylidene fluoride. The resultant was then stirred with a ball mill, thereby preparing a use slurry.

[0110] Next, the application slurry was applied to a substrate having a thickness of 12 μm as a polyethylene microporous membrane (commercially available from Tonen General Sekiyu K.K.) using a ...

Embodiment 2

[0116] The heat-resistant layers were individually formed on both faces of the substrate so that one heat-resistant layer had a thickness of 1.55 μm and the total heat-resistant layers had a thickness of 3.1 μm. A microporous membrane with a heat-resistant layer was produced in the same manner as employed in Example 1 except for such a process configuration.

[0117] In the microporous membrane produced in this way, the total thickness of the heat-resistant layer was 6.2 times the average particle diameter of the heat-resistant particles contained in the heat-resistant layer. In addition, in the surface of the heat-resistant layer, it was found that the number of protrusions was 20.7 and the area was 46.1 μm 2 .

Embodiment 3

[0119] The heat-resistant layers were individually formed on both faces of the substrate so that the thickness of one heat-resistant layer was 2.75 μm and the total thickness of the heat-resistant layers was 5.5 μm. A microporous membrane with a heat-resistant layer was produced in the same manner as employed in Example 1 except for such a process configuration.

[0120] In the microporous membrane produced in this way, the total thickness of the heat-resistant layer was 11.0 times the average particle diameter of the heat-resistant particles contained in the heat-resistant layer. In addition, in the surface of the heat-resistant layer, it was found that the number of protrusions was 1.4 and the area was 1.0 μm 2 .

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
porosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a heat-resistant microporous film and a battery separator. The heat-resistant microporous film and a battery separator are provided, which each include a substrate formed by using a porous film and include a heat-resistant layer formed on at least one surface of the substrate so as to contain a heat-resistant resin and heat-resistant particles, and in which a protrusion is formed on a surface of the heat-resistant layer in number not exceeding 60 per surface area of 0.0418 mm2 and has an area not exceeding 500 [mu]m2 per surface area of 0.0418 mm2 in a direction normal to a surface of the heat-resistant layer, the protrusion being formed as a result of aggregation of the heat-resistant particles and having a height of at least twice the average particle size of the heat-resistant particles with reference to the height average surface of the heat-resistant layer.

Description

[0001] This application is a divisional application of an invention patent application with an application date of November 10, 2011, an application number of 201110354115.7, and an invention title of "heat-resistant microporous membrane and battery separator". technical field [0002] The present invention relates to a heat-resistant microporous film (heat-resistant microporous film) having a heat-resistant insulating layer (heat-resistant insulating layer), and more particularly relates to a heat-resistant microporous film each having a substrate (substrate) and a heat-resistant layer (heat-resistant layer). A thermal microporous film and a battery separator, the substrate is made by using a polyolefin resin, and the heat-resistant layer has a structure in which inorganic particles are contained in the heat-resistant resin. Background technique [0003] In recent years, portable electronic information devices such as mobile phones, camcorders, and notebook computers have be...

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): H01M2/14H01M2/16H01M2/18H01M10/42H01M50/403H01M50/451H01M50/457H01M50/463H01M50/489H01M50/491
CPCH01M10/4235H01M10/052H01M50/446H01M50/403H01M50/463H01M50/451H01M50/491H01M50/489H01M50/457Y10T428/24372Y02E60/10H01M10/0525H01M2220/30
Inventor 柿部亚希子李成吉冈本和广
Owner MURATA MFG CO LTD
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