Lithium battery composite diaphragm coated with hybrid aramid fibers and preparation method of lithium battery composite diaphragm

A technology of composite diaphragm and battery diaphragm, which is applied in the direction of lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of demanding coating process and equipment, difficulties in lithium battery diaphragms, and sensitivity to moisture content, etc., to reduce Storage cost, not easy to precipitate, and the effect of improving tolerance

Inactive Publication Date: 2019-06-25
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, para-aramid (1414) is sensitive to moisture content, is easy to precipitate, and is not easy to store. When used as a separator coating, the coating process and equipment are demanding, and it is very difficult to industrially produce para-aramid-coated lithium battery separators.

Method used

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  • Lithium battery composite diaphragm coated with hybrid aramid fibers and preparation method of lithium battery composite diaphragm
  • Lithium battery composite diaphragm coated with hybrid aramid fibers and preparation method of lithium battery composite diaphragm
  • Lithium battery composite diaphragm coated with hybrid aramid fibers and preparation method of lithium battery composite diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) At room temperature, in the reactor, add 25L dimethylacetamide / calcium chloride solvent, feed nitrogen, and stir, add p-phenylenediamine (PPD), until completely dissolved, at this time, the reactor body The temperature will gradually rise to about 40°C, stir and continue to cool down, so that the temperature in the kettle body drops to about 10°C, add isophthaloyl chloride (IPC), react for 20 minutes, add calcium hydroxide, and make the pH value of the synthesis solution reach Neutral, after 4 minutes, the prepared slurry containing poly-p-phenylene isophthalamide (1314 aramid fiber) is poured into a closed plastic bucket;

[0031] (2) Select a polyethylene battery separator with a thickness of 9 μm, send the battery separator to the coating device, use the slurry prepared in step (1) to coat, and apply dip coating to both sides of the battery separator;

[0032] (3) immersing the battery diaphragm coated in step (2) in a plasticizing bath, where the plasticizing ba...

Embodiment 2

[0035] The difference between this example and Example 1 is that a ceramic separator with a 9 μm polyethylene base film + 3 μm inorganic ceramic particle coating is selected as the battery separator, and the same slurry as in Example 1 is used for coating.

Embodiment 3

[0037] The difference between this embodiment and Example 1 is: using m-phenylenediamine (MPD) and terephthaloyl chloride (TPC) as reaction monomers to prepare poly-m-phenylenediamine terephthalamide (1413 aromatic Lun) slurry; use this slurry to coat battery separators.

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Abstract

The invention discloses a lithium battery composite diaphragm coated with hybrid aramid fibers and a preparation method of the lithium battery composite diaphragm. One side or two sides of the batterydiaphragm are coated with the hybrid aramid fibers, and the hybrid aramid fiber coating is formed by the coating slurry containing hybrid aramid fibers. The hybrid aramid fibers are fibers made of one or two of poly (p-phenylene Isophthalamide) and poly-m-phenylene terephthalamide. The aramid fibers are employed for forming the hybrid aramid fiber coating, and the hybrid aramid fibers are low insensitivity to water, are not liable to separate out and are easy to store, so that the water tolerance of the aramid fiber slurry is greatly improved, the storage cost of the aramid fiber coating slurry and the requirements on coating equipment are reduced. The lithium battery diaphragm is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium battery separator materials, and in particular relates to a hybrid aramid-coated lithium battery composite separator and a preparation method thereof. Background technique [0002] As a new type of secondary battery, lithium battery has the advantages of high energy density and long cycle life. Its application range continues to expand and is widely used in portable electronic devices, electric tools, energy storage and power vehicles. With the rapid development, lithium batteries are more and more used in power vehicles. However, frequent lithium battery safety accidents have aroused widespread concern. Among them, the separator, as an important part of the lithium battery, can effectively prevent the short circuit between the positive and negative electrodes, which has a very important impact on the safety of the lithium battery. Therefore, the performance improvement and safety requirements of the lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCY02E60/10
Inventor 陶晶王志豪陈瀚罗婷
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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