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A lithium battery diaphragm and preparation method thereof

A lithium battery separator and olefin-based film technology, which is applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of low ionic conductivity and low lithium ion migration number.

Active Publication Date: 2020-06-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the lithium battery separator is made by coating a single-scale ceramic coating on the surface of the polyolefin base film. Although the performance of the lithium battery separator is improved to a certain extent by coating a single coating on the base film, the There are still technical problems of low ionic conductivity and low lithium ion migration number

Method used

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  • A lithium battery diaphragm and preparation method thereof
  • A lithium battery diaphragm and preparation method thereof
  • A lithium battery diaphragm and preparation method thereof

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preparation example Construction

[0036] Based on the same inventive concept, an embodiment of the present invention also provides a method for preparing a lithium battery separator, the method comprising:

[0037] Add the inorganic oxide precursor to the alumina dispersion, stir for 2-4 hours, add a binder and a second organic additive, and continue stirring for 3-4 hours to obtain a core-shell structure inorganic oxide slurry;

[0038] The inorganic oxide slurry with the core-shell structure is coated on the surface of the porous polyolefin base film, and dried to prepare a lithium battery diaphragm.

[0039] In the present application, in parts by weight, the alumina dispersion is 80-90 parts, the inorganic oxide precursor is 0.4-5 parts, the binder is 3-6 parts, and the organic additive Makes 3-4 servings.

[0040] In the present application, the adhesive is a polyacrylic adhesive, including any one of polymethylacrylate, polyethylacrylate, and polyacrylamide, and the second organic additive includes a we...

Embodiment 1

[0044] (1) Calculated by weight, take 45 parts of micron alumina particles, mix 0.398 parts of polyoxyethylene neutral surfactant with 54.602 parts of deionized water, pre-disperse on a mechanical mixer for 10 minutes, and then grind on a grinder for 30 minutes , filtered and iron removed to obtain an alumina dispersion.

[0045] (2) Take 88.88 parts of alumina dispersion, add 4g ethanol, 0.8g tetraethyl orthosilicate, stir for 2-4 hours, add 6 parts of polyacrylic acid, 3.7 parts of polyoxyethylene neutral surfactant, stir for 3- After 4 hours, a coating slurry of a core-shell structure oxide was obtained.

[0046] (3) Apply the coating slurry to the surface of a 12-micron PE diaphragm by scraping, and dry it at 60 degrees Celsius for 1 hour to obtain a single-sided coated SiO 2 @Al 2 o 3 / PE separator, the thickness of the inorganic layer is 4 microns.

[0047]Coat one side with SiO 2 @Al 2 o 3 / PE diaphragm for morphology characterization, air permeability, electrica...

Embodiment 2

[0049] (1) Calculated by weight, take 45 parts of micron alumina particles, mix 0.398 parts of polyoxyethylene neutral surfactant with 54.602 parts of deionized water, pre-disperse on a mechanical mixer for 10 minutes, and then grind on a grinder for 30 minutes , filtered and iron removed to obtain an alumina dispersion.

[0050] (2) Take 88.88 parts of alumina dispersion, add 4g ethanol, 1.4g tetraethyl orthosilicate, stir for 2-4 hours, add 6 parts of polyacrylic acid, 3.7 parts of polyoxyethylene neutral surfactant, stir for 3- After 4 hours, a coating slurry of a core-shell structure oxide was obtained.

[0051] (3) Coat the coating slurry on the surface of a 12-micron PE diaphragm by scrape coating, and dry it at 60 degrees Celsius for 1 hour to obtain a single-sided coated SiO 2 @Al 2 o 3 / PE separator, the thickness of the inorganic layer is 4 microns.

[0052] Coat one side with SiO 2 @Al 2 o 3 / PE diaphragm for morphology characterization, air permeability, ele...

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Abstract

The invention relates to a lithium battery diaphragm and a preparation method thereof. The lithium battery diaphragm comprises a porous polyolefin-based film and a core-shell structure inorganic oxidecoating layer, wherein the battery diaphragm and preparation method thereof is arranged on a surface of the porous polyolefin-based film, a coating material of the battery diaphragm and preparation method thereof is core-shell structure inorganic oxide particle, and the core-shell structure inorganic oxide particle comprises submicron inorganic oxide core and a nanometer inorganic oxide shell layer.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a lithium battery diaphragm and a preparation method thereof. Background technique [0002] The performance of the lithium battery separator determines the interface structure and internal resistance of the lithium battery, which directly affects the capacity, cycle and safety performance of the lithium battery. A separator with excellent performance plays an important role in improving the overall performance of the lithium battery. At present, the lithium battery separator is made by coating a single-scale ceramic coating on the surface of the polyolefin base film. Although the performance of the lithium battery separator is improved to a certain extent by coating a single coating on the base film, the There are still technical problems of low ionic conductivity and low Li-ion transfer number. Contents of the invention [0003] In view of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 施利毅杨建袁帅王竹仪
Owner SHANGHAI UNIV
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