High-strength lithium battery separator and production technology thereof

A lithium battery diaphragm and production process technology, applied in the field of high-strength lithium battery diaphragm and its production process, can solve the problems of not improving the safety of the lithium ion battery diaphragm, affecting the electrical performance of the lithium ion battery, and peeling off of the ceramic coating. Excellent chemical stability, extended life, small pore size effect

Inactive Publication Date: 2018-01-19
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilize the existing dry-process lithium-ion battery separator (uniaxially stretched PP, PE and biaxially asynchronously stretched PP, bidirectionally synchronously stretched PE) to directly coat water-soluble nano-ceramic solution on it, and dry at low temperature (40-60 ℃), but the ceramic coating and the substrate polyolefin microporous membrane cannot form an organic whole, especially the bonding interface strength between the ceramic and the polyolefin membrane is very weak, causing the ceramic coating to partially fall off (coating hole, interlayer Peeling) or a large area of ​​peeling off; and this ceramic coating lithium-ion battery separator produces a lot of powder when cutting because of the weak interface; the most serious problem is that when the ceramic coating is separated from the matrix polyolefin film inside the battery , the electrolyte is enriched between the interlayers, causing the battery to deform. If the ceramic coating falls off from the substrate inside the battery, it will not only fail to improve the safety of the lithium-ion battery separator, but will affect the performance of the lithium-ion battery because of the shedding ceramic nano-powder. electrical properties

Method used

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  • High-strength lithium battery separator and production technology thereof
  • High-strength lithium battery separator and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of polyether ether ketone

[0030] Weigh 23.1kg 3,3'-dimethyl-4,4'-difluorobenzophenone, 10.4kg 2-methyl-1,4-butanediol, 52.3kg 1,1-sulfonyl bisphenyl Add it into the reaction kettle, blow nitrogen while stirring, and heat up to 150°C. After it is completely dissolved, add 25.2kg of nano-magnesium carbonate, heat up to 230°C for 2 hours, and then heat up to 310°C for 20 minutes to obtain a polymerized mucus. Quickly pour into distilled water and keep stirring to obtain crude polyether ether ketone particles. The crude polyetheretherketone was repeatedly extracted with acetone for 3 times, using 1L of acetone each time to remove the solvent diphenyl sulfone, and then washed with 30% nitric acid for 2 times to remove a small amount of magnesium fluoride produced by the reaction. Finally, it was washed with distilled water for 10 times, each time using 500 ml of distilled water to remove nitric acid, and dried to obtain polyether ether ketone with a purity...

Embodiment 2

[0036] (1) Preparation of polyether ether ketone

[0037] Weigh 26.3kg of 2-diphenyl-4,4'-difluorobenzophenone, 13.5kg of 4-hydroxyethyl p-cresol, and 45.6kg of sulfolane into the reaction kettle, and pass nitrogen gas while stirring And heat up to 150°C. After all the solution is dissolved, add 37.8kg of nano-magnesium carbonate, heat up to 230°C for 2 hours, and then heat up to 310°C for 20 minutes to obtain a polymeric viscous, which is quickly poured into distilled water and continuously stirred to obtain polymeric mucus. Ether ether ketone crude granules. The crude polyether ether ketone was repeatedly extracted with acetone 6 times, using 1L of acetone each time to remove the solvent sulfolane, and then washed with 30% nitric acid once to remove a small amount of magnesium fluoride produced by the reaction , and finally washed 6 times with distilled water, using 500ml of distilled water each time to remove nitric acid, and dried to obtain polyether ether ketone with a p...

Embodiment 3

[0043] (1) Preparation of polyether ether ketone

[0044] Weigh 22.4kg 3-chloro-4,4'-difluorobenzophenone, 17.8kg 1,3-dimethylhydroquinone, 35.9kg 1,1-sulfonyl bisphenyl, 24.6kg tetrahydrothiophene Add sulfone into the reaction kettle, pass nitrogen gas while stirring, and heat up to 150°C. After it is completely dissolved, add 30.2kg of sodium magnesium carbonate, heat up to 230°C for 2 hours, and then heat up to 310°C for 20 minutes to obtain polymerization The mucus was quickly poured into distilled water and stirred continuously to obtain crude polyether ether ketone particles. The crude polyether ether ketone was repeatedly extracted with acetone 5 times, using 1L of acetone each time to remove the solvents 1,1-sulfonylbiphenyl and sulfolane, and then the polyether ether ketone was washed once with 30% nitric acid. To remove a small amount of magnesium fluoride produced by the reaction, and finally wash with distilled water 8 times, each time using 500ml of distilled wat...

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Abstract

The invention discloses a high-strength lithium battery separator and a production technology thereof. The technology comprises the steps of putting a halogenated ketone compound and a dihydroxy compound into a solvent to synthesize polyetheretherketone under the action of carbonate; and stretching a polyetheretherketone nanofiber membrane obtained through melting extrusion at a high temperature to form the high-strength lithium battery separator. According to the polyetheretherketone, the thermal distortion temperature under load can reach 316 DEG C, the instantaneous service temperature canreach 300 DEG C, the polyetheretherketone has excellent chemical stability and can meet the requirements of the lithium battery separator on chemical corrosion resistance and high strength performance, the service life of the lithium battery separator can be well prolonged, and meanwhile, the security is improved; and the prepared high-strength lithium battery separator has the advantages of a relatively small aperture, relatively large specific surface area, high tearing strength, high anti-puncture strength, high dielectric breakdown strength and good chemical stability.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-strength lithium battery diaphragm and a production process thereof. Background technique [0002] Lithium batteries have developed rapidly in recent years, but the safety and high performance of lithium batteries have always been the key issues restricting their development. The separator is an electrically insulating film with a porous structure. Its main function is to isolate the positive and negative electrodes and prevent the electrons in the battery from freely passing through, while allowing the ions in the electrolyte to pass freely between the positive and negative electrodes. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and other characteristics of the battery. [0003] The technology of coating heat-resistant materials on the polyolefin matrix separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/411
CPCY02E60/10
Inventor 吴磊胡伟张德顺李汪洋王若愚徐凤锦刘志强孙晓华
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL
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