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

Preparation method of high-performance composite diaphragm and composite diaphragm

A composite diaphragm, high-performance technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of lower puncture strength than wet diaphragm and low tensile strength, so as to improve thermal safety and increase tensile strength , to avoid the effect of short circuit

Active Publication Date: 2014-07-02
SHENZHEN SENIOR TECH MATERIAL
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an important disadvantage of the dry-processed separator is that the tensile strength in the TD (transverse) direction is low, resulting in an overall puncture strength that is not as good as that of the wet-processed separator.

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
  • Preparation method of high-performance composite diaphragm and composite diaphragm
  • Preparation method of high-performance composite diaphragm and composite diaphragm
  • Preparation method of high-performance composite diaphragm and composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] A method for preparing a high-performance composite diaphragm, comprising the steps of:

[0030] Step 1: Coating a layer of treatment liquid on one side of the dry-process uniaxially stretched polyolefin membrane to improve the adhesion between the nanometer polyimide fiber layer and the polyolefin membrane layer;

[0031] Step 2: dissolving the binary organic acid anhydride and the organic diamine in a polar aprotic solvent to obtain a polyimide, and re-dissolving the polyimide in a polar aprotic solvent to obtain a spinning dope;

[0032] Step 3: Using the electrospinning method, spray the spinning stock solution on the polyolefin membrane treated in step 1, and the polyolefin membrane is fixed on a receiver, wherein the TD direction of the polyolefin membrane is in line with the rotation direction of the drum Consistent, the electrospinning temperature is 15-90°C, forming a primary polymer composite diaphragm with an oriented nano-polyimide fiber layer;

[0033] Ste...

Embodiment 1

[0046] Accurately weigh 2.1812g of pyromellitic anhydride (PMDA) and 2.0023g of 4,4'-diaminodiphenyl ether (ODA) into 25ml of N,N-dimethylacetamide (DMAc), stir at low temperature for 8 Hours, polyamic acid (PAA-1) solution was obtained. Subsequently, a mixed solution of acetic anhydride and triethylamine (volume ratio 1:1.5) was added, and the reaction was continued for 24 hours to obtain a yellow homogeneous and transparent polyimide solution. The solution was deposited in excess ethanol / water mixture, washed, filtered and dried to obtain polyimide (PI-1).

[0047] Weigh an appropriate amount of PI-1 and redissolve it in DMAc to prepare a spinning dope with a solid content of 15% for electrospinning. The spinning conditions are: spinning voltage 20kv, advancing speed 2.0mm / min, receiving distance 25mm, ambient temperature 25°C, ambient humidity 35%. A layer of two-component PU adhesive was applied on the polypropylene separator to increase the connection with the nanofiber...

Embodiment 2

[0049] The preparation of spinning dope is the same as in Example 1.

[0050] Spinning conditions: spinning voltage 15kv, advancing speed 1.5mm / min, receiving distance 15mm, ambient temperature 25°C, ambient humidity 35%. A layer of two-component PU adhesive was applied on the polypropylene separator to increase the connection with the nanofibers, and then it was fixed on the drum, and the TD direction was consistent with the rotation direction of the drum. During collection, the linear speed of the drum was 1.4 m / min, and the thickness of the layer of oriented nanofibers was 10 μm. The prepared composite film was subjected to hot pressing at 60° C. to remove residual solvent to obtain an oriented polyimide nanofiber / PP composite film.

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
Line speedaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a high-performance composite diaphragm. The preparation method comprises the following steps of 1, smearing a layer of processing liquid on one side of a dry-method unilaterally stretched polyolefin diaphragm; 2, dissolving binary organic anhydride and organic diamine in a polarity aprotic solvent to obtain polyimide, and re-dissolving the polyimide in the polar aprotic solvent to obtain a spinning crude solution; 3, spraying the spinning crude solution on the polyolefin diaphragm processed in the step 1 by utilizing an electrostatic spinning method to form a primary polymer composite diaphragm with an oriented nano polyimide fiber layer; and 4, processing the primary polymer composite diaphragm obtained in the step 3 in the hot air of 50 to 100 DEG C for 1 hour to 12 hours to be dried, and after-treating (such as hot-pressing for shaping) the composite diaphragm to obtain the polymer composite diaphragm. The invention also discloses a composite diaphragm prepared by utilizing the preparation method. The prepared composite diaphragm has the advantages that the strength and safety of the dry-method unilaterally stretched polyolefin diaphragm can be effectively improved.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery, in particular to a method for preparing a high-performance composite diaphragm capable of effectively improving the strength and safety performance of a dry-process uniaxially stretched polyolefin diaphragm and the composite diaphragm. Background technique [0002] With the popularity of 3C products and the rise of the electric vehicle market, the demand for lithium-ion secondary batteries is increasing. As a key component of lithium-ion batteries, the performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. Therefore, the development of high-performance separators has become an important direction to improve the performance of lithium batteries, especial...

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): H01M2/14H01M50/403H01M50/417H01M50/423H01M50/44H01M50/449H01M50/454H01M50/457
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 吴术球冯涛鲁东奎
Owner SHENZHEN SENIOR TECH MATERIAL
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