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

High-temperature-resistant coating modified separator as well as preparation method and application thereof

A high-temperature-resistant polymer, temperature-sensitive technology, applied in the direction of separator/film/diaphragm/spacer element, coating, electrical components, etc., can solve the problem of reducing the energy density of lithium-ion batteries, coating layer peeling, fire and explosion and other problems, to achieve the effect of good electrolyte wettability, strong wettability and high safety

Active Publication Date: 2019-07-09
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
View PDF8 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the high density of inorganic substances such as alumina, the surface density of the polyolefin separator coated on the surface is higher than that of the polyolefin separator, which inevitably reduces the energy density of the lithium-ion battery. At the same time, it is similar to the high-temperature-resistant polymer coated modified separator. , when the temperature is higher than the melting point of polyolefin, the base film will melt and shrink, causing the coating layer to fall off and be damaged, resulting in short circuit of the battery, or even fire and explosion

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
  • High-temperature-resistant coating modified separator as well as preparation method and application thereof
  • High-temperature-resistant coating modified separator as well as preparation method and application thereof
  • High-temperature-resistant coating modified separator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] N used in this embodiment, N'-methylenebismaleimide (C 9 h 6 N 2 o 4 ) structural formula is as follows:

[0051]

[0052] 1mol (206.16g) N, N'-methylenebismaleimide (C 9 h 6 N 2 o 4 ) mixed with 0.005 mol of azobisisobutyronitrile and 3008.25 g of N-methylpyrrolidone, reacted at 50°C for 24 hours, then weighed 1 mol of barbituric acid, divided into six equal parts, and added to the reaction system at intervals of half an hour, all Added and then reacted for 9 hours to obtain reaction solution A (temperature-sensitive high-temperature-resistant polymer) with a solid content of 10%.

[0053] Weigh 100g of the above reaction solution A, add 20g of nano ceramics and 2g of PVDF, add 198g of N-methylpyrrolidone, and stir for 2.5 hours to obtain solution B, which has a solid content of 10%, which can be used as a lithium battery separator coating material.

[0054] Filter the above solution B to obtain a uniformly dispersed slurry. Use the transfer coating method t...

Embodiment 2

[0056] Mix 358.35 g of 1 mol of N,N'-(methylene diphenyl) bismaleimide with 0.01 mol of azobisisobutyronitrile and 729.66 g of N-methylpyrrolidone, react at 80°C for 0.5 hours, and then Weigh 128.09 g of 1 mol of barbituric acid, divide it into 3 portions, add it into the reaction system at intervals of half an hour, and react for 2 hours after adding all of them to obtain a reaction solution A with a solid content of 40%. Take 500g of this solution A, add 70g of nano ceramics and 100g of PVDF, add 255g of N-methylpyrrolidone, and stir for 0.5 hours to obtain solution B (40% solid content, which can be used as a lithium battery separator coating material). After filtering, use In the transfer coating method, both sides of the PE base film are coated, and dried at 100° C., and the coating layer with a thickness of 5 μm after drying is obtained to obtain a modified diaphragm.

Embodiment 3

[0058] 1mol 2,2-bis[4-(4-maleimidephenoxy)phenyl]propane (C 35 h 26 N 2 o 6 ) 570.60g mixed with 0.05mol azobisisobutyronitrile and 1939g gamma-butyrolactone, reacted at 75°C for 12 hours, then weighed 0.6mol melamine 75.672g, divided into six parts, and added to the reaction system at intervals of half an hour , and reacted for 0.5 hour after adding all of them to obtain reaction solution A with a solid content of 25%. Take by weighing 100g of this solution A, add 250g of nano-ceramics and 55g of PVDF, add 1000g of gamma-butyrolactone and mix, stir for 6 hours to obtain solution B (solid content 23.5%, can be used as lithium battery diaphragm coating material), after filtration, Coating on both sides of the PE base film by means of gravure printing, drying at 120° C., and obtaining a coating layer with a thickness of 4 μm after drying, to obtain a modified diaphragm.

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a high-temperature-resistant coating modified separator as well as a preparation method and application thereof. The modified separator provided by the invention is formed by coating a single surface or double surfaces of a base membrane with a coating material, wherein the coating material comprises a temperature-sensitive high-temperature-resistant polymer, a binder and nano ceramic; the temperature-sensitive high-temperature-resistant polymer is obtained by a polymerization reaction of a bismaleimide monomer and an amine monomer with multiple reaction functional groups. The modified separator prepared by the invention has the advantages of high temperature sensitivity, strong electrolyte wettability, high safety, high temperature resistance and the like, and can greatly improve the use safety and prolong the service life of the lithium ion battery when being used for preparing the lithiumion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a high-temperature-resistant coated and modified diaphragm, a preparation method and application thereof. Background technique [0002] As a new generation of green secondary batteries, lithium-ion batteries have outstanding advantages such as high voltage, high specific energy, long cycle life, small self-discharge, and no memory effect, so they are very popular among people. In lithium-ion batteries, lithium-ion battery separator is an important part of lithium-ion batteries, and its performance has attracted people's attention. Lithium-ion battery separators must have good chemical stability, have excellent mechanical properties (tensile lightness and puncture strength), and have high temperature resistance characteristics. With the continuous improvement of the specific energy of lithium batteries, higher and higher requirements are placed on the temper...

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): C08J7/04C08L23/12C08L23/06C09D135/00C09D7/61C09D7/65H01M2/14H01M2/16H01M50/403H01M50/411
CPCC08L23/12C08L23/06C09D135/00C09D7/61C09D7/65C08J2323/12C08J2323/06C08J2435/00H01M50/40H01M50/403H01M50/411H01M50/44C08J7/0427C08L27/16C08K3/00Y02E60/10
Inventor 刘丙学李翔王建涛张海燕庞静
Owner CHINA AUTOMOTIVE BATTERY RES INST 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