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PVDF-HFP-based composite porous polymer diaphragm and preparation method thereof

A diaphragm and lithium-based technology, which is applied in the field of fluoropolymer-based composite porous polymer diaphragm and its preparation, can solve the problems of complex film-making process and simple diaphragm mechanical strength, and achieve the effect of simple preparation process and uniform thickness

Active Publication Date: 2014-06-04
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a poly(vinylidene fluoride-hexafluoropropylene) with simple process and good overall performance for the above-mentioned problem that the film-making process is complicated, or the film-making process is relatively simple but the mechanical strength of the diaphragm is low. Preparation method of lithium-ion battery separator

Method used

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  • PVDF-HFP-based composite porous polymer diaphragm and preparation method thereof
  • PVDF-HFP-based composite porous polymer diaphragm and preparation method thereof
  • PVDF-HFP-based composite porous polymer diaphragm and preparation method thereof

Examples

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Effect test

Embodiment 1

[0045] Take 50 mL of tetrahydrofuran and acetone and mix them as an organic solvent for the composite component, add 19 g of vinylidene fluoride-hexafluoropropylene (Arkema, KYNAR2801) and mix, and stir mechanically at a constant temperature at 50 ° C for 1.5 hours to obtain a clear and viscous sol; add 1.5 g Nano filler SiO 2 (particle size 20-50nm), continue to stir for 1.5 hours; take 7mL of ethanol and 3mL of water and mix it as a composite component anti-solvent, drop it into the above-mentioned sol with a constant pressure dropping funnel, continue to stir for 1.5 hours, and obtain a milky white viscous casting Film liquid; after defoaming, use an automatic film applicator to coat a glass plate at a temperature of 15°C and a humidity of 80%; Take it off and dry it in a vacuum oven at 50° C. for 24 hours to obtain the poly(vinylidene fluoride-hexafluoropropylene)-based lithium-ion battery separator of the present invention. Among them, by adjusting the gap of the scraper...

Embodiment 2

[0048] Take 50 mL of tetrahydrofuran and acetone and mix them as an organic solvent for the composite component, add 19 g of vinylidene fluoride-hexafluoropropylene (Arkema, KYNAR2801) and mix, and stir mechanically at a constant temperature at 60°C for 1.0 hour to obtain a clear and viscous sol; add 1.5 g Nano filler Al 2 o 3 (particle size 50-100nm), continue to stir for 1.5 hours; take n-butanol 8mL and water 2mL and mix it as a composite component anti-solvent, drop it into the above-mentioned sol with a constant pressure dropping funnel, and continue to stir for 1.5 hours to obtain a milky white viscous Thick casting film solution; after standing defoaming, in an environment with a temperature of 20°C and a humidity of 40%, use an automatic film applicator to coat a glass plate as a substrate; naturally volatilize the solvent and anti-solvent, and form The film was removed and dried in a vacuum oven at 60° C. for 16 hours to obtain the poly(vinylidene fluoride-hexafluoro...

Embodiment 3

[0051] Take 100mL of acetone as a solvent, add 19g of vinylidene fluoride-hexafluoropropylene (Arkema, KYNAR2801) to mix, and stir mechanically at a constant temperature at 50°C for 1.5 hours to obtain a clear and viscous sol; 1.5g of nano-filler SiO 2 (particle size 20-50nm), continue to stir for 1.5 hours; drip anti-solvent water 6mL with a constant pressure dropping funnel, continue to stir for 1.5 hours to obtain milky white viscous casting solution; ℃, the humidity is 80%, the glass plate is used as the substrate, and the automatic film applicator is used to coat the film; the solvent and anti-solvent are naturally volatilized, the formed film is removed, and dried in a vacuum oven at 50 ℃ for 36 hours. That is, the poly(vinylidene fluoride-hexafluoropropylene)-based lithium ion battery separator described in the present invention is obtained. Among them, by adjusting the gap of the scraper, a series of poly(vinylidene fluoride-hexafluoropropylene)-based lithium-ion batte...

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Abstract

The invention relates to a poly(vinylidene fluoride-hexafluoropropylene)-based lithium-ion battery diaphragm and a preparation method thereof. The diaphragm is prepared by a phase inversion method comprising the following steps of dissolving poly(vinylidene fluoride-hexafluoropropylene), a modified polymer and nanometer filler under the certain ratio in an organic solvent, adding a nonsolvent after stirring and mixing uniformly at the certain temperature, continuously stirring till the nonsolvent is dispersed uniformly, de-foaming, coating, drying and the like to obtain the poly(vinylidene fluoride-hexafluoropropylene)-based lithium-ion battery diaphragm. The poly(vinylidene fluoride-hexafluoropropylene)-based lithium-ion battery diaphragm disclosed by the invention has the advantages that the thickness is uniform and is easy to control, the cellular structure is uniform, the mechanical strength is high, and the industrialization is easy to be realized.

Description

technical field [0001] The invention relates to a fluorine-containing polymer-based composite porous polymer diaphragm and a preparation method thereof, in particular to a preparation method of a fluorine-containing polymer lithium-ion battery diaphragm. Background technique [0002] Lithium-ion battery is a new type of secondary rechargeable battery. Because of its high working voltage, large capacity, long cycle life, and no pollution, it is widely used in portable electronic devices such as notebook computers, mobile phones, and power tools. It is the most promising new generation of "green" battery in the 21st century. Lithium-ion batteries mainly include liquid lithium-ion batteries and polymer lithium-ion batteries. Liquid lithium-ion batteries use liquid electrolytes, usually made of hard materials such as steel shells or aluminum shells, which are not suitable for lightweight, thin, and prone to electrolyte leakage, with poor safety performance. The polymer lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/426H01M50/446
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 李义涛程丛栗彦娜汤诚黄凯金李林
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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