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Prepn of polyvinylidene difluoride film for secondary lithium ion battery

A polyvinylidene fluoride, secondary battery technology, used in battery pack parts, circuits, electrical components, etc.

Inactive Publication Date: 2003-09-10
QINGNIAO HUAGUANG BATTERY WEIFANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this paper only discusses the influence of a single component of solvent and non-solvent on the film-forming properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First, tetrahydrofuran (THF) and acetone are mixed according to a weight ratio of 1:1 to form a composite component solvent, then water and ethanol are mixed according to a weight ratio of 1:1 to form a composite component non-solvent, and the solvent and non-solvent are mixed according to 84: After mixing evenly at a weight ratio of 8, mix according to the weight ratio of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP): mixture of mixed component solvent and mixed component non-solvent = 8:92, at 40°C-70°C Stir at constant temperature for 2-6 hours to obtain a clear and viscous sol, which can be scraped on a smooth glass plate or coated with aluminum foil on a coating machine, let the solvent and non-solvent evaporate naturally, and remove the dried film The polyvinylidene fluoride film of the present invention can be obtained by placing it in an environment of 60°C and drying for 24 hours.

Embodiment 2

[0017] First, tetrahydrofuran (THF) and acetone are mixed according to the weight ratio of 1:1 to form a composite component solvent, and after the composite component solvent and water are mixed uniformly according to a weight ratio of 84:8, according to polyvinylidene fluoride-hexafluoropropylene ( PVDF-HFP): mixed component solvent and water mixture = 8:92 weight ratio mixed, stirred at a constant temperature of 40°C-70°C for 2-6 hours to obtain a clear and viscous sol, scraped on a smooth glass plate Coating or coating on a coating machine with aluminum foil as a carrier, let the solvent and non-solvent volatilize naturally, remove the dried film and put it in an environment of 60 ° C for 24 hours to obtain the polyvinylidene fluoride film of the present invention . .

Embodiment 3

[0019] First, water and ethanol are mixed according to a weight ratio of 1:1 to form a composite component non-solvent, and after acetone and a composite component non-solvent are mixed uniformly according to a weight ratio of 84:8, the polyvinylidene fluoride-hexafluoropropylene (PVDF -HFP): acetone and mixed component non-solvent mixture = 8: 92 weight ratio mixing, constant temperature stirring at 40°C-70°C for 2-6 hours, to obtain a clear viscous sol, scrape on a smooth glass plate Coating or coating on a coating machine with aluminum foil as a carrier, let the solvent and non-solvent volatilize naturally, remove the dried film and put it in an environment of 60 ° C for 24 hours to obtain the polyvinylidene fluoride film of the present invention . .

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PUM

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Abstract

This invention relates to a method for preparing PVDF film used in Li ion secondary battery, mixing TFH with acetone to complex component solvent then mixing water with alcohol to complex component unsolvent, mixing the two solvents in 84:8 weight ratio evenly, then to mix PVDF-HFP with the mixture of the two solvents according to 8:92 weight ratio to get this invented PVDF film after stirring up, coating and dry. This invented electrolyte film has small aperture, unregular network structure good for absorbing electrolyte, stable chemical and electric chemical performance and good ionic conductivity.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride film used for a lithium ion secondary battery. technical background [0002] Lithium-ion batteries have the characteristics of high specific energy, high working voltage, light weight, small self-discharge, long cycle life, stable discharge performance, no memory effect, and low environmental pollution. At present, lithium-ion battery products mainly use metal as the shell. When the thickness is reduced, the volume of the shell will decrease, and the amount of active materials in the shell will decrease, which will lead to a decrease in the specific energy of the battery. The use of flexible packaging not only makes the battery very thin and has a high specific energy, but also can be cut in size arbitrarily, and the appearance design is free. It can also buffer the internal pressure of the battery and improve the safety of the battery. Thin-film lithium-io...

Claims

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Application Information

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IPC IPC(8): C08J5/18H01M2/14H01M2/16
CPCY02E60/10
Inventor 刘伯文袁定凯徐伟
Owner QINGNIAO HUAGUANG BATTERY WEIFANG
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