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A lithium battery separator in a high-strength fiber structure and a preparation method and application thereof

A high-strength fiber and separator technology, applied in structural parts, circuits, electrical components, etc., can solve the problem of not meeting the actual use requirements of high-current charge and discharge of power lithium-ion batteries, poor pore structure stability and mechanical pull-up performance, nanometer problems such as poor fiber binding force, to achieve good ion transport performance, improve charge and discharge performance and safety performance, and be suitable for large-scale production.

Inactive Publication Date: 2019-04-05
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the battery test results show that the battery diaphragm obtained by this method has a relatively low pore size, which cannot meet the actual use requirements of high-current charging and discharging of power lithium-ion batteries.
In addition, some researchers have used electrospinning to prepare nanofiber lithium battery separators, which can obtain higher porosity, but due to the poor bonding force between nanofibers, the pore structure stability and mechanical pulling performance of this kind of separators Poor, still needs further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using dimethylformamide as a solvent, a polyvinylidene fluoride spinning solution with a concentration of 16% was prepared and dissolved at 50° C. with mechanical stirring at 200 rpm for 4 hours. Then add 4.5% polyaramid fibers to the spinning solution, the polyaramid fibers have a diameter of about 2.2 microns and a length of about 30 microns.

[0024] Using a spinning needle with an aperture of 0.8mm, a propulsion speed of 6ml / min, a receiving distance of 14cm, and an electrostatic voltage of 18KV, the separator was prepared by electrospinning.

Embodiment 2

[0034] Using dimethyl sulfoxide as a solvent, prepare a polyimide spinning solution with a concentration of 12%, and dissolve it with mechanical stirring at 200 rpm at room temperature for 6 hours. Then add 15% glass fiber to the spinning solution, the diameter of the glass fiber is about 1.2 microns, the length is about 50 microns, after mixing evenly, defoaming treatment, let it stand for later use.

[0035] Using a spinning needle with an aperture of 0.8mm, a propulsion speed of 6ml / min, a receiving distance of 8cm, and an electrostatic voltage of 25KV, the separator was prepared by electrospinning.

Embodiment 3

[0045] Using acetone / dimethylacetamide with a mass ratio of 1:1 as a solvent, prepare a polytetrafluoroethylene spinning solution with a concentration of 4.6%, and dissolve it for 12 hours at 60° C. with mechanical stirring at 200 rpm. Then add 9.2% silicon oxide fibers to the spinning solution, the diameter of the silicon oxide fibers is about 3.5 microns, and the length is about 20 microns.

[0046] Using a spinning needle with an aperture of 0.6mm, a propulsion speed of 12ml / min, a receiving distance of 20cm, and an electrostatic voltage of 25KV, the separator was prepared by electrospinning.

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Abstract

The invention discloses a lithium battery in a high-strength fiber structure and a preparation method thereof. According to the invention, micro fibers are uniformly dispersed into a nano fiber spinning solution, and the micro fibers are insoluble in the nano fiber spinning solution and can stably exist. The separator is prepared by an ectrospinning method. The separator produced by the inventionhas good ion transfer performance, puncture resistance and tensile strength performance; the separator can withstand the puncture strength of more than 300 g, and the tensile strengths in both the transverse and longitudinal directions are more than 50 MPa, thereby effectively improving the charge and discharge performance and safety performance of the battery. The production technology is simple;the efficiency is high; and the lithium battery separator is suitable for scale production.

Description

technical field [0001] The invention relates to the field of battery diaphragm preparation, in particular to a high-strength fiber structure lithium battery diaphragm and its preparation method and application. Background technique [0002] All countries in the world have raised the new energy industry to an unprecedented strategic height, and the development of power batteries has attracted widespread attention. As an important component of lithium-ion batteries, the diaphragm is used to isolate the positive and negative electrodes of the battery, while allowing conductive ions to pass through to ensure that the battery completes the charging and discharging process, and its performance has an important impact on the battery. As one of the four major components of lithium batteries, microporous separators represented by polyethylene and polypropylene have become the current mainstream commercial lithium battery separators. However, in view of the low melting point and low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/40H01M50/403H01M50/44
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 彭辉肖伟
Owner DONGGUAN UNIV OF TECH
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