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

A kind of aromatic polyamide slurry, porous diaphragm and preparation method thereof

An aramid and slurry technology, applied in structural parts, battery pack parts, electrical components, etc., can solve the problems of difficult control of pore size uniformity, high water absorption rate of porous membrane, uneven pore size, etc. Reduction of core capacity and cycle performance, reduction of suppression capacity and cycle performance, good effect of pore size uniformity

Active Publication Date: 2022-01-18
微宏先进膜公司
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent announcement number CN104053714B and patent publication number CN103943806A respectively disclose a method for preparing a porous aramid membrane. The membrane is generally prepared by short-fiber pulp papermaking or non-solvent-induced phase inversion method. The former has poor mechanical properties and pore size Inhomogeneity, while the latter problem of pore size uniformity is still difficult to control, and the water absorption rate of the porous diaphragm prepared by the bulk structure of polyamide is relatively high, and the pore size uniformity and moisture content of the diaphragm are important factors affecting the performance of the cell. factor

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
  • A kind of aromatic polyamide slurry, porous diaphragm and preparation method thereof
  • A kind of aromatic polyamide slurry, porous diaphragm and preparation method thereof
  • A kind of aromatic polyamide slurry, porous diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Aramid slurry preparation

[0073] Mix polym-phenylene isophthalamide, N,N-dimethylformamide and lithium chloride at a mass ratio of 18.4:76.8:4.8 to obtain a transparent aromatic polyamide solution; add reactive Add adipoyl chloride, and stir at room temperature for 2 hours to form polym-phenylene isophthalamide: N,N-dimethylformamide: lithium chloride: adipoyl chloride with a mass ratio of 17.8:74.3 : 4.6: 3.3 aramid slurry, the rotational viscosity of the obtained aramid slurry is 488,000cp.

[0074] (2) Preparation of porous diaphragm

[0075] Extrude the aramid slurry onto the tetrafluoro chain belt to form a liquid film with a thickness of about 20um; immerse the tetrafluoro chain belt together with the liquid film into water and N,N-dicarbonate with a mass ratio of 25:75 A coagulation bath composed of methylformamide, the temperature of the coagulation bath is 30°C, stay in the coagulation bath for 2 minutes, and the liquid film forms a film in the coagulat...

Embodiment 2

[0081] Same as Example 1, except that the mass ratio of polym-phenylene isophthalamide, N,N-dimethylformamide, lithium chloride, and adipoyl chloride in the aramid slurry is replaced by 19.8:75.2 :2.9:2.1, the rotational viscosity of the obtained aramid slurry was 546,000cp.

[0082] The obtained separator had a porosity of 52.3%, an air permeability of 94s / 100cc, a moisture content of 3620ppm, an average pore diameter of 47.5nm, and an average pore diameter standard deviation of 0.023.

Embodiment 3

[0084] Same as in Example 1, except that poly-p-phenylene terephthalamide is used instead of poly-m-phenylene isophthalamide, and the rotational viscosity of the obtained aramid slurry is 643,000 cp. The obtained diaphragm had a porosity of 61.4%, an air permeability of 74s / 100cc, a moisture content of 3240ppm, and an average pore diameter of 93.8nm, with a standard deviation of the average pore diameter of 0.021.

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
pore sizeaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
thermal decomposition temperatureaaaaaaaaaa
Login to View More

Abstract

The invention provides an aromatic polyamide slurry, which comprises the following raw materials: 15-30wt% aromatic polyamide compound, 2-15wt% reactive additives and 59-82wt% solvent, and 0.5-7wt% co-solvent can be added to the aromatic polyamide slurry, and a porous diaphragm prepared by using the aromatic polyamide slurry and a preparation method thereof are also provided. The aromatic polyamide porous diaphragm prepared by the present invention has high temperature resistance, good pore size uniformity and low moisture content, and can effectively improve the safety performance of the battery cell when applied to a lithium-ion battery while suppressing the cell capacity and degradation of cycle characteristics.

Description

technical field [0001] The invention relates to the field of aromatic polyamide slurry, in particular to an aromatic polyamide slurry, a porous diaphragm and a preparation method thereof. Background technique [0002] At present, lithium battery separators are mainly porous films based on polyolefins, including PE separators, PP and PE multiple composite separators, and coated separators coated with inorganic ceramic materials, but are limited by polyolefin substrates. There is no fundamental difference in the fusing temperature of these types of diaphragms. With the increasing demand for the development of large-capacity lithium-ion power batteries, it is important to develop a new type of temperature-resistant lithium-ion diaphragm to promote the further development of lithium-ion batteries. meaning. [0003] Aramid (PPTA, PMIA, PBA, PSA) has a glass transition temperature of about 300°C, a thermal decomposition temperature greater than 500°C, and has the advantages of hi...

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 Patents(China)
IPC IPC(8): H01M50/423H01M50/403C08L77/10C08J9/28
CPCY02E60/10
Inventor 何庆一孙婉露孙庆津
Owner 微宏先进膜公司
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