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High-temperature resistant non-woven composite membrane for power lithium-ion battery and preparation method for high-temperature resistant non-woven composite membrane

A lithium-ion battery, composite diaphragm technology, applied in secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc. Performance testing, expensive and complex equipment, etc., to achieve the effect of simple operation, low equipment requirements, and improved cycle performance

Active Publication Date: 2014-03-26
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method seems simple, but the corona and plasma methods for pretreatment require expensive and complicated equipment, which is difficult to be widely used in industry
[0012] There are also some reports on this aspect, such as Hyun-Seok Jeong et al. (Reference: Journal of Membrane Science415–416(2012)513–519) based on PET non-woven fabric, nano-SiO 2 The polyvinylidene fluoride-hexafluoropropylene copolymer is dispersed in a solvent by ball milling in a certain proportion, and then coated on both sides of the polyolefin diaphragm (dipping coating), and vacuum-dried to remove the solvent to obtain a non-woven composite diaphragm. The diaphragm reported in this paper The heat resistance is at 150°C, and there is no thermal performance test at a higher temperature. It can be seen that although this method is simple, it cannot greatly improve the heat resistance of the diaphragm, because under high temperature treatment, it is stuck by the adhesive. The knotted coating is easy to peel off

Method used

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  • High-temperature resistant non-woven composite membrane for power lithium-ion battery and preparation method for high-temperature resistant non-woven composite membrane
  • High-temperature resistant non-woven composite membrane for power lithium-ion battery and preparation method for high-temperature resistant non-woven composite membrane
  • High-temperature resistant non-woven composite membrane for power lithium-ion battery and preparation method for high-temperature resistant non-woven composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0053] (1) Activation of the surface of the non-woven fabric: soak the PP non-woven fabric in the prepared 1.5g / L methacryl dopamine solution for 48 hours, wash off the methacryl dopamine attached to the surface with distilled water, and dry naturally , to obtain a modified non-woven fabric.

[0054] (2) Preparation of coating sol by sol-gel method: Add tetraethyl orthosilicate, water and alcohol successively, stir and mix well, then add 1mol / L HCl and γ-glycidyl etheroxypropyl trimethoxysilane ( The amount used is 5% of the weight of silica microspheres), stirred and reacted, wherein the mass ratio of ethyl orthosilicate, ethanol, water and hydrochloric acid is 1:2:7:1, and the particle size is 300nm after an interval of 3h. Silica microspheres (the amount used is 6% of the total mass of the substances added to prepare the sol), continue to react for 24 hours, and the sol can be obtained.

[0055] (3) Use the prepared sol to coat both sides of the modified non-woven fabric c...

Embodiment 4

[0058] (1) Activation of the surface of the non-woven fabric: Soak the PP non-woven fabric in the prepared 2g / L dopamine solution for 48 hours, wash off the dopamine attached to the surface with distilled water, and dry it naturally to obtain the modified non-woven fabric.

[0059] (2) Preparation of coating sol by sol-gel method: Add tetraethyl orthosilicate, water and isopropanol successively, stir and mix well, then add 1mol / L HCl and γ-aminopropyltriethoxysilane dropwise successively (dosage is 8% of the weight of silica microspheres), stirred and reacted, wherein the mass ratio of ethyl orthosilicate, alcohol, water and hydrochloric acid was 1:2:10:2, after an interval of 6h, the carbon dioxide with a particle size of 420nm was added Silicon microspheres (the amount used is 15% of the total mass of the substances added to prepare the sol), continue to react for 32 hours, and the sol can be obtained.

[0060] (3) Use the prepared sol to coat both sides of the modified non-...

Embodiment 5

[0063] (1) Activation of the surface of the non-woven fabric: Soak the PP non-woven fabric in the prepared 3g / L dopa solution for 48 hours, wash off the dopamine attached to the surface with distilled water, and dry it naturally to obtain the modified non-woven fabric.

[0064] (2) Preparation of coating sol by sol-gel method: Add tetraethyl orthosilicate, water and methanol successively, stir and mix well, then add 1mol / L HCl and 3-(methacryloyloxy)propyltrimethoxy successively dropwise Silane (the amount used is 5% of the weight of silica microspheres), stirred and reacted, wherein the mass ratio of ethyl orthosilicate, alcohol, water and hydrochloric acid is 1:2:10:1, and the particle size is 500nm after an interval of 10h Silica microspheres (the amount used is 20% of the total mass of the substances added to prepare the sol), continue to react for 32 hours, and the sol can be obtained.

[0065] (3) Use the prepared sol to coat both sides of the modified non-woven fabric c...

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Abstract

The invention belongs to the field of lithium-ion battery membrane materials, and discloses a high-temperature resistant non-woven composite membrane for a power lithium-ion battery and a preparation method for the high-temperature resistant non-woven composite membrane. The non-woven composite membrane is prepared through the following steps: carrying out pre-treatment to non-woven cloth; introducing an active group containing hydrogen in non-woven surface and fiber holes, so as to obtain modified non-woven cloth; preparing sol by adopting a sol-gel method, coating the modified non-woven cloth with the sol, so as to obtain the non-woven composite membrane. The non-woven composite membrane prepared through the preparation method has excellent thermal stability, good air permeability and electrolyte wettability and high security, and has high potential for use in high-energy power lithium ion batteries. The preparation process is simple, equipment requirements are low, and achievement of industrialization is facilitated.

Description

technical field [0001] The invention belongs to the field of diaphragm materials for lithium-ion batteries, and in particular relates to a high-temperature-resistant non-woven composite diaphragm for power lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently widely used in portable electronic products such as rechargeable batteries required for mobile phones, notebook computers, cameras, etc., and have gradually expanded to power tools, large power supplies, and other fields. Lithium-ion batteries have the advantages of high power density, low self-discharge rate, and no memory effect, and gradually replace traditional lead-acid batteries and nickel-cadmium batteries. [0003] The increasingly severe environmental problems have made people shift their attention to vehicles with energy storage batteries as the main power source. The attention of hybrid electric vehicles (HEV) has increased, and the possibili...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/414H01M50/446H01M50/449
CPCY02E60/122H01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 胡继文李妃胡盛逾吴艳苗磊齐健罗洪盛
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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