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A kind of polyaryletherketone for lithium battery separator

A lithium battery separator and polyaryletherketone technology, which is applied in the field of polyaryletherketone, can solve the problems of the adverse effect of the interface layer on the battery efficiency, the best performance of the lithium battery separator, and the poor wettability of the electrolyte. Charge transfer and Li-ion conduction, ease of commercialization, and improved electrochemical performance

Active Publication Date: 2022-02-25
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of polyaryletherketone improves the heat resistance and mechanical properties of the battery separator, but the adhesion of the polyaryletherketone to the polyolefin separator is poor, and the interface layer adversely affects the efficiency of the battery, which is not suitable for commercial use. to promote
[0007] It is worth noting that the polyolefin film is also hydrophobic and has poor wettability to the electrolyte, which is not conducive to the migration of lithium ions during charge and discharge. Unilaterally improving the performance of polyaryletherketone cannot make the performance of the lithium battery separator reach the best. , it is also necessary to improve the wettability of the polyolefin membrane to the electrolyte and the adhesion to PAEK

Method used

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  • A kind of polyaryletherketone for lithium battery separator
  • A kind of polyaryletherketone for lithium battery separator
  • A kind of polyaryletherketone for lithium battery separator

Examples

Experimental program
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Effect test

preparation example Construction

[0052] Preparation of Polyaryletherketone

[0053] Monomer 1 is selected from hexafluorobisphenol A, monomer 2 is selected from 4,4-bis(4-hydroxyphenyl)valeric acid, and monomer 3 is selected from 2,2'-diallylbisphenol A as an example , adopt four kinds of monomers to prepare the polyaryl ether ketone of the present invention, and its synthetic route is as follows:

[0054]

[0055] The specific steps are as follows: in a three-necked flask equipped with a mechanical stirrer, a nitrogen inlet tube, a thermometer and a water separator, add hexafluorobisphenol A (0.32mol), 4,4-bis(4-hydroxyphenyl)pentane in turn Acid (0.08mol) 5, 2,2'-diallylbisphenol A (0.4mol), 1,4 bis(4-fluorobenzoyl)benzene (0.88mol), anhydrous potassium carbonate (0.84mol) , 750ml of sulfolane (TMS), 350ml of toluene, pass nitrogen, and heat up to 140 °C for 3 hours with stirring. After the water generated by the reaction is completely taken out, continue to heat up to release toluene, and then heat u...

Embodiment 1

[0070] Prepared using the above steps, Oxidized modified PP lithium battery separator In the step, the ozone concentration of the ozone generator is set to 25%, and the treatment time is 25min. After the treatment is completed, take out the PP membrane, place it on a glass plate, and flatten it; coating forming In the step, draw 2 ml of the coating solution prepared above on the film, set the thickness of the scraping film of the scraper to 15 μm, and follow the steps of 1 cm s. -1 speed to scrape the film. Using methanol water as a coagulation bath, the prepared PAEK-coated PP lithium battery separator was placed in a coagulation bath (mixed solution with a volume ratio of methanol:water of 1:4), phase inversion was carried out at 25 ° C, and the mixture was uniform. Let stand for 10 min until the solution is stable. The PAEK-coated PP lithium battery separator after phase inversion is taken out, soaked in pure water to remove the salt solution, and vacuum-dried to pre...

Embodiment 2

[0072] Other operations are the same as in Example 1, the difference is that in Oxidized modified PP lithium battery separator In the step, the ozone concentration of the ozone generator is set to 30%, and the treatment time is 30 min.

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Abstract

The present invention provides a polyarylether ketone used for a lithium battery diaphragm and a lithium battery diaphragm comprising the polyarylether ketone. The polyarylether ketone includes the following structural unit: the structure of the chain link AR is: the present invention The provided lithium battery separator is prepared by coating polyaryletherketone on the surface of the ozone-modified polyolefin film, scraping the film, and phase inversion to obtain a lithium-ion battery separator, which has excellent thermal stability and electrochemical performance. The lithium-ion battery obtained from the battery separator has excellent comprehensive performance, and its discharge specific capacity, Coulombic efficiency and cycle stability are all significantly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and particularly relates to a polyaryletherketone used for a lithium battery separator. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, wide operating temperature range, high energy density, long cycle life, low pollution, and no memory effect. They have become the most promising and competitive secondary batteries. It is widely used in many high-tech fields such as aerospace and mechanical equipment. With lower manufacturing costs and further improvements in performance such as battery life and reliability, lithium-ion batteries have emerged in applications such as electric vehicles and energy storage. [0003] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes and battery shells. As an important part of lithium-ion batteries, the main function of the separator is to avoid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/414H01M50/403H01M50/449H01M50/417H01M10/0525C08G65/40
CPCH01M10/0525C08G65/4025Y02E60/10
Inventor 呼微杜新伟卢云峰朱广山赵麒刘佰军
Owner NORTHEAST NORMAL UNIVERSITY
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