Para-aramid lithium battery diaphragm and preparation method thereof

A lithium battery separator and para-aramid technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problem of para-aramid being insoluble in polar solvents, and improve cycle performance and heat resistance. , the effect of increasing the energy density

Pending Publication Date: 2022-04-22
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a para-aramid lithium battery separator and a preparation method thereof, to overcome the problems in the prior art, the present invention can effectively solve the problem that para-aramid is insoluble in polar solvents, and the obtained lithium The battery separator further improves the cycle performance of the battery without reducing other properties

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  • Para-aramid lithium battery diaphragm and preparation method thereof
  • Para-aramid lithium battery diaphragm and preparation method thereof

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preparation example Construction

[0029] A preparation method of para-aramid lithium battery separator, comprising the following steps:

[0030] Step 1, the preparation of wet-process aramid porous membrane layer 1: add a cosolvent in an organic solvent under nitrogen protection, dissolve p-phenylenediamine, slowly add terephthaloyl chloride to react while stirring, and react in ice It is carried out in a water bath, and after reacting for 30 minutes, a neutralizing agent is added for neutralization to obtain a para-aramid polymerization solution with a concentration of 0.5-10wt / %. Pour the above-mentioned para-aramid polymerization solution on a glass plate, scrape the film with a scraper, put it in a water bath for phase inversion film formation, take it out, dry it in a 60°C drying oven for 1 hour, and take it out to obtain a wet-process aramid Porous film layer.

[0031] Step 2. Preparation of the aramid nanofiber layer: add a cosolvent and a modifier to an organic solvent under nitrogen protection, disso...

Embodiment 1

[0035] Add CaCl to 30 ml of NMP under nitrogen protection 2 , dissolve 1.0814g p-phenylenediamine, react in an ice-water bath, slowly add 2.1317g terephthaloyl dichloride while stirring, add 0.56g potassium hydroxide to neutralize after reacting for 30min, and obtain a concentration of 10wt / % p-phenylenediamine Aramid polymer solution. Pour the above polymerization solution on a glass plate, scrape the film with a scraper, put it in a water bath for phase inversion film formation, take it off, put it in a drying oven at 60°C for 1 hour, and take it out to obtain a wet-process film with a thickness of 10 μm. Aramid porous membrane layer.

[0036] Under the condition of nitrogen protection, add LiCl in 150ml of DMAc, add 0.0003g of polyethylene glycol, dissolve 1.0814g of p-phenylenediamine, then slowly add 1.9896g of terephthaloyl dichloride to react while stirring, and react in ice Carry out in a water bath, add 100ml DMAc after reacting for 30min, break the gel of the mixtu...

Embodiment 2

[0038] Add CaCl to 50ml of NMP under nitrogen protection 2, dissolve 1.0814g p-phenylenediamine, react in an ice-water bath, slowly add 2.0708g terephthaloyl chloride while stirring, add 0.40g sodium hydroxide to neutralize after reacting for 30min, and obtain a concentration of 6wt / % p-phenylenediamine Aramid polymer solution. Pour the above polymerization solution on a glass plate, scrape the film with a scraper, put it in a water bath for phase inversion film formation, take it out, put it in a drying oven at 60°C for 1 hour, and take it out to obtain a wet-process film with a thickness of 8 μm. Aramid porous membrane layer.

[0039] Add CaCl to 20 ml of NMP under nitrogen protection 2 , add 0.6g of terminal methyl polyoxyethyl ether, dissolve 1.0814g of p-phenylenediamine, then slowly add 2.0708g of terephthaloyl chloride to react while stirring, the reaction is carried out in an ice-water bath, after 30min of reaction, add 10ml of DMAc, The gel of the mixture was broke...

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Abstract

The invention provides a para-aramid lithium battery diaphragm and a preparation method thereof.The para-aramid lithium battery diaphragm comprises a wet-process aramid porous membrane layer, and the upper surface and the lower surface of the wet-process aramid porous membrane layer are both covered with aramid nanofiber layers; the aramid nanofiber layer is prepared by coating a para-aramid nanofiber aqueous solution on the wet-process aramid porous membrane layer. The problem that para-aramid is difficult to dissolve in a polar solvent can be effectively solved, and the cycle performance of a battery is further improved while other properties of the obtained lithium battery diaphragm are not reduced.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, and relates to a para-aramid lithium battery diaphragm and a preparation method thereof. Background technique [0002] With the unexpected growth of new energy vehicles, the demand for power lithium battery separators continues to grow. People are paying more and more attention to the mileage and safety of power batteries. The diaphragm can block the contact between the positive and negative electrodes. At present, the power lithium battery diaphragm is mostly made of polyolefin diaphragm. In order to improve the cruising range and heat resistance, the polyolefin diaphragm is usually modified with polyvinylidene fluoride (PVDF) or ceramics. The PVDF coating is used to improve the bonding performance of the separator and the electrode, and the ceramic coating is used to improve the wettability and heat resistance of the separator and the electrolyte. These two methods also have disadvant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/491H01M50/403
CPCH01M50/491H01M50/403
Inventor 陈琪马千里唐凯高殿飞潘玉琳尚晴
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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