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

Lithium battery composite diaphragm as well as preparation method and application thereof

A composite diaphragm and lithium battery technology, which is applied to lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of single function of the composite diaphragm, inability to have flame retardant function and conductivity at the same time, and achieve a simple preparation method. , Easy to enlarge the effect of production

Active Publication Date: 2022-08-09
CHINA THREE GORGES CORPORATION +1
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the single function of the composite diaphragm in the prior art, which cannot simultaneously have a flame retardant function and a high Li + Ion conductivity and other performance defects, thereby providing a lithium battery composite diaphragm and its preparation method and application

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
  • Lithium battery composite diaphragm as well as preparation method and application thereof
  • Lithium battery composite diaphragm as well as preparation method and application thereof
  • Lithium battery composite diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The present embodiment provides a preparation method of a lithium battery composite separator, comprising the following steps:

[0046] Step 1, put 100 parts by weight of Al 2 O 3 (average particle size 400 nm), 20 parts by weight of monomer M1, 0.2 parts by weight of initiator potassium persulfate, and 8 parts by weight of other additives were added to water, ball-milled uniformly, and configured into slurry N1 with a solid content mass fraction of 20%. Other additives include 0.5 parts by weight of dispersant polyethylene glycol, 3 parts by weight of thickener sodium carboxymethyl cellulose, 4 parts by weight of binder polymethacrylic acid and 0.5 parts by weight of wetting agent fluoro Alkyl methoxy alcohol ether.

[0047] The structural formula of M1 is

[0048]

[0049] In the formula, A=-CH 2 CH 2 -, n=1.

[0050] An example of the preparation method of monomer M1 is:

[0051] Under argon atmosphere in the glove box, the raw material 0.01mol BrCH 2 CHBrCH...

Embodiment 2

[0056] The present embodiment provides a preparation method of a lithium battery composite separator, comprising the following steps:

[0057] Step 1. 100 parts by mass of SiO 2 (average particle size of 500 nm), 20 parts by mass of monomer M2, 0.2 parts by mass of initiator potassium persulfate, and 8 parts by mass of other additives were added to water, ball-milled uniformly, and prepared into a slurry N2 with a solid content mass fraction of 20%. Other additives include 0.5 parts by weight of dispersant polyethylene glycol, 3 parts by weight of thickener sodium carboxymethyl cellulose, 4 parts by weight of binder polymethacrylic acid and 0.5 parts by weight of wetting agent fluoro Alkyl methoxy alcohol ether.

[0058] The structural formula of M2 is

[0059]

[0060] In the formula, -CH(OCH 3 )CH 2 -, n=2.

[0061] The preparation method of monomer M2 is:

[0062] Under argon atmosphere in the glove box, the raw material 0.01molBrCH 2 CHBrCH 2 OH was dissolved in...

Embodiment 3

[0067] The present embodiment provides a preparation method of a lithium battery composite separator, comprising the following steps:

[0068] Step 1. 100 parts by mass of TiO 2 (average particle size of 300 nm), 10 parts by mass of monomer M3, 0.1 part by mass of initiator potassium persulfate, and 10.8 parts by mass of other additives were added to water, ball-milled uniformly, and configured into slurry N3 with a solid content of 30% by mass. Other additives include 0.8 parts by weight of dispersant polyethylene glycol, 2 parts by weight of thickener sodium carboxymethyl cellulose, 7 parts by weight of binder polymethacrylic acid and 1 part by weight of wetting agent fluorine Alkyl methoxy alcohol ether.

[0069] The structural formula of M3 is

[0070]

[0071] In the formula, -CH(OCH 3 )CH(OCH 3 )-, n=5.

[0072] The preparation method of monomer M3 is:

[0073] Under argon atmosphere in the glove box, the raw material 0.01mol BrCH 2 CHBrCH 2 OH was dissolved i...

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a lithium battery composite diaphragm as well as a preparation method and application thereof, belongs to the technical field of lithium batteries, and overcomes the defects that a composite diaphragm in the prior art is single in function and cannot have a flame-retardant function and relatively high conductivity of Li < + > ions at the same time. The lithium battery composite membrane comprises a base membrane and a coating coated on at least one surface of the base membrane, the coating comprises a ceramic material and a polymer forming a three-dimensional network structure, and the ceramic material is uniformly coated by the polymer or uniformly dispersed in three-dimensional network gaps of the polymer. The composite diaphragm simultaneously contains a high-temperature-resistant ceramic material and a functional polymer formed by polymerizing a monomer with a specific structure, the polymer and ceramic particles fully act to form a coating layer, and the ceramic material and the polymer have a synergistic effect, so that the functions of high temperature resistance, flame retardance and lithium ion conduction of the diaphragm can be simultaneously realized; meanwhile, the electrical performance and the safety performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery composite diaphragm and a preparation method and application thereof. Background technique [0002] Thermal runaway is inevitable in liquid batteries, which endangers battery safety. Thermal runaway is a chain reaction that begins with the rupture of the negative electrode / electrolyte interphase (SEI), the redox reaction between the positive electrode and the electrolyte, and the redox reaction between the positive electrode and the negative electrode with the largest heat release, and finally the battery burns and explodes. Mechanical abuse, electrical abuse, thermal abuse can all induce thermal runaway. Improving battery safety through separator design is an important approach. [0003] The prior art discloses a composite diaphragm, which includes a base film, a ceramic layer coating coated on the base film, and a polymer coating coated...

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
IPC IPC(8): H01M50/446H01M50/403H01M50/434H01M50/449H01M50/451H01M50/457H01M50/489H01M10/052C08J7/05C08L23/06C09D4/02C09D4/06C09D7/61
CPCH01M50/446H01M50/449H01M50/457H01M50/451H01M50/434H01M50/489H01M50/403H01M10/052C08J7/05C09D4/06C09D7/61C08J2323/06Y02E60/10
Inventor 王倩杨琪尹立坤祖晨曦孙长平俞会根
Owner CHINA THREE GORGES CORPORATION
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