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Diaphragm as well as preparation method and application thereof
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A technique for diaphragms and supporting substrates, applied in the field of diaphragms and their preparation
Active Publication Date: 2021-05-28
SOUTH CHINA NORMAL UNIVERSITY
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[0005]
Based on this, it is necessary to provide a separator and its preparation method and application for the problem of how to improve the safety under the premise of ensuring the performance of lithium-ion batteries
Method used
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preparation example Construction
[0061]Seefigure 1 , The method of preparing the diaphragm of an embodiment of the present invention, including the steps of:
[0063]Among them, triphenyl phosphate and magnesiumhydroxide are composite flame retardants. Tutinyl phosphate, magnesium hydroxide, binder, and solvent can be mixed with stirring, wherein the addition of triphenyl phosphate, magnesium hydroxide, binder, and solvent is not limited.
[0064]Among them, the solvent is preferably acetone. The above-mentioned phosphate triphenyl esters, magnesium hydroxide and binders can be dissolved in acetone faster, and the acetone is easy to remove.
[0065]In one embodiment, the solid content of the mixed solution is 5% to 15%. In the adhesive adhesion of the mixed solution of the solid content, if the concentration is high, the fluidity is poor, it is not easy to use; if the concentration is too low, the fluidity of the m...
Embodiment 1
[0078]1 g of magnesium magnesium hydroxide, 3 g of phenyl phosphate and 1 g of polyvinylidenee-hexafluoropropylene were added to 95 g of acetone, and the mixture was stirred at 40 ° C water bath, 350 rpm was stirred for one hour to obtain a mixed uniform mixed solution.
[0079]The PE support matrix membrane of 10 cm ╳ 62.5mm ╳ 20.0 μm was soaked in the above mixing solution, and then quickly pulled up from the mixed solution, dry at room temperature, and then transferred to a 60 ° C oven for 12 hours. The flame retardant coating is formed on both surfaces of the support base film to obtain the diaphragm of Example 1.
Embodiment 2
[0081]2 g of magnesium hydroxide, 2 g of phosphate, and 1 g of polyvinylidenee - hexafluoropropylene were added to 95 g of acetone, and the mixture was stirred at 40 ° C water bath, 350 rpm was stirred for an hour to give a mixed uniform mixing solution.
[0082]The PE support matrix membrane of 10 cm ╳ 62.5mm ╳ 20.0 μm was soaked in the above mixing solution, and then quickly pulled up from the mixed solution, dry at room temperature, and then transferred to a 60 ° C oven for 12 hours. The flame retardation coating is formed on both surfaces of the support base film to obtain the diaphragm of Example 2.
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Abstract
The invention relates to a diaphragm as well as a preparation method and application thereof. The diaphragm comprises a supporting matrix membrane; at least one surface of the supporting matrix membrane is provided with a flame-retardant coating; and the flame-retardant coating is a mixture of a composite flame retardant and a binder. The composite flame retardant comprises the following components in parts by mass: 20-80 parts of magnesiumhydroxide; and 20 to 80 parts of triphenyl phosphate. When the diaphragm is applied to a lithiumion battery, the safety of the battery can be improved on the premise of ensuring the performance of the lithiumion battery, and the application is facilitated. In addition, the invention also relates to a preparation method of the diaphragm, a lithiumion battery comprising the diaphragm and an electronic product comprising the lithium ion battery.
Description
Technical field[0001]The present invention relates to the field of lithium ion batteries, and in particular, to a diaphragm and a preparation method thereof.Background technique[0002]Lithium-ion battery is the most common commercial secondary battery, which has the advantages of high energy density, high output voltage, long cycle life, self-discharge and no memory effect, and is widely used in mobile electronic equipment and power batteries. in.[0003]As the secondary lithium-ion battery is widely used, its safety and reliability become more important. The diaphragm, one of the important components of the lithium ion battery, plays an important role in which the physical barrier positive and negative electrode should also allow lithium ions to pass. If the heat resistance of the membrane is poor, the high temperature generated when the high current charge is discharged, causing its size to shrink or deform, resulting in a positive and negative short circuit, resulting in battery the...
Claims
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Application Information
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