Lithium ion battery composite diaphragm and preparation method thereof

A lithium-ion battery and composite diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of diaphragm melting, battery destruction, explosion, etc., to improve thermal stability and safety, reduce surface tension, The effect of improving coating performance

Active Publication Date: 2014-11-12
HENAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polyolefins are widely used in the manufacture of lithium-ion battery separators. Compared with other materials, polyolefin films have better mechanical properties and chemical stability, but their own thermal stability is limited, and they are also flammable substances. During the use of lithium-ion batteries, a short circuit occurs due to defects in the separator or the precipitated metal lithium reacts with the electrolyte to generate a large amount of heat, which causes the entire separator to melt at the melting temperature and thus causes a large-scale short circuit. Destroy the battery due to fire or even explosion

Method used

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  • Lithium ion battery composite diaphragm and preparation method thereof
  • Lithium ion battery composite diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The preparation method of lithium-ion battery composite diaphragm in the present embodiment is:

[0042] (1) Preparation of fluorine-containing emulsion: Add 1kg of tetrafluoroethylene, 0.25g of nonylphenol polyoxyethylene ether, 0.25g of ammonium perfluorooctanoate, 0.005g of ammonium persulfate, 0.005g of sodium bisulfite and 2kg of deionized water into the reaction vessel In, tetrafluoroethylene was introduced after vacuuming, so that the pressure in the container reached 1.5MPa, and polymerized at 50°C for 3 hours to obtain a polytetrafluoroethylene aqueous emulsion;

[0043] (2) Preparation of polyacrylate-coated fluorine-containing emulsion: Take 1kg of the emulsion prepared in step (1), first add 1g ethyl acrylate, 1g methyl acrylate, 0.5g acrylic acid, swell for 1 hour, heat up to 80°C, and then Add 0.5g nonylphenol polyoxyethylene ether, 0.01g ammonium persulfate, 3g ethyl acrylate, 3g methyl acrylate, and 1.5g acrylic acid, keep warm for 1 hour, cool down to o...

Embodiment 2

[0047] The preparation method of lithium-ion battery composite diaphragm in the present embodiment is:

[0048] (1) Preparation of fluorine-containing emulsion: 1kg of chlorotrifluoroethylene, 0.25g of nonylphenol polyoxyethylene ether, 0.25g of ammonium perfluorooctanoate, 0.005g of potassium persulfate, 0.005g of sodium bisulfite and 2kg of deionized water were added to the reaction In the container, after vacuuming, feed chlorotrifluoroethylene to make the pressure in the container reach 1.5 MPa, polymerize at 50°C for 3 hours, and obtain a polychlorotrifluoroethylene aqueous emulsion;

[0049] (2) Preparation of polyacrylate-coated fluorine-containing emulsion: Take 1kg of the emulsion prepared in step (1), first add 1g of ethyl acrylate, 1g of methyl methacrylate, and 0.5g of acrylic acid, swell for 1 hour, and heat up to 80°C. Then add 0.5g of nonylphenol polyoxyethylene ether, 0.01g of ammonium persulfate, 3g of ethyl acrylate, 3g of methyl methacrylate, and 1.5g of acr...

Embodiment 3

[0054] The preparation method of lithium-ion battery composite diaphragm in the present embodiment is:

[0055] (1) Preparation of fluorine-containing emulsion: Add 1kg of ethylene fluoride, 2.5g of nonylphenol polyoxyethylene ether, 2.5g of ammonium perfluorooctanoate, 0.05g of ammonium persulfate, 0.05g of sodium bisulfite and 2kg of deionized water into the reaction vessel In the process, after vacuuming, ethylene fluoride was introduced to make the pressure in the container reach 1.5MPa, and polymerized at 50°C for 3 hours to obtain a polyvinyl fluoride aqueous emulsion;

[0056] (2) Preparation of polyacrylate-coated fluorine-containing emulsion: Take 1kg of the emulsion prepared in step (1), first add 11.25g of butyl acrylate, 11.25g of methyl methacrylate, and 2.5g of methacrylic acid, swell for 1 hour, and heat up To 80°C, add 5g of nonylphenol polyoxyethylene ether, 0.1g of ammonium persulfate, 22.5g of butyl acrylate, 22.5g of methyl methacrylate, and 5g of methacryl...

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Abstract

Belonging to the technical field of lithium ion batteries, the invention discloses a lithium ion battery composite diaphragm and a preparation method thereof. The composite diaphragm comprises a polyolefin diaphragm and a fluorine-containing macromolecular polymer coating covering at least one surface of the polyolefin diaphragm. Compared with existing polyolefin diaphragms, the composite diaphragm has significantly enhanced thermal stability and safety, and plays a flame retardant role. At the same time, according to the invention, a composite surfactant, a composite silicone defoaming agent, an emulsion suspension stabilizer and a polyether silicone oil leveling agent are added into a polyacrylate cladded fluorine-containing emulsion to perform modification, and the coating performance of the fluorine-containing macromolecular polymer emulsion is improved. The preparation method for the composite diaphragm provided by the invention is simple, and is suitable for large-scale industrial production and application.

Description

technical field [0001] The invention specifically relates to a lithium-ion battery composite diaphragm and a preparation method of the composite diaphragm, belonging to the technical field of lithium-ion batteries. Background technique [0002] Due to the advantages of high voltage, high specific energy, long cycle life and no pollution to the environment, lithium-ion batteries have been widely researched and applied in recent years, and have become the main power source of various electronic products. Lithium-ion secondary batteries are generally composed of positive and negative electrodes, separators, electrolytes and casings. The separator is an important part of the battery, which has a unique characteristic of being non-conductive and allowing ions to pass through. The role of the separator in the lithium-ion battery is to separate the positive and negative electrodes to prevent short circuits, and at the same time to ensure that lithium ions can pass through freely, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08J5/18C08J7/04C08L23/00C09D151/00C09D7/12C08F259/08C08F220/18C08F220/14
CPCC09D151/00C08F259/08C08J7/04C08J2323/00C08J2451/00H01M50/403H01M50/411C08F220/18C08F220/1808C08F220/1804C08F220/1802Y02E60/10
Inventor 杨书廷尹艳红朱学海荆正军毛新欣曹朝霞岳红云董红玉武大鹏
Owner HENAN NORMAL UNIV
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