A high temperature resistant non-woven composite diaphragm for power lithium ion battery and preparation method thereof

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

Active Publication Date: 2017-04-12
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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  • A high temperature resistant non-woven composite diaphragm for power lithium ion battery and preparation method thereof
  • A high temperature resistant non-woven composite diaphragm for power lithium ion battery and preparation method thereof
  • A high temperature resistant non-woven composite diaphragm for power lithium ion battery and preparation method thereof

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 diaphragm materials for lithium-ion batteries, and discloses a high-temperature-resistant non-woven composite diaphragm for power lithium-ion batteries and a preparation method thereof. The non-woven fabric composite diaphragm of the present invention is obtained by the following preparation method: through the pretreatment of the non-woven fabric, hydrogen-containing active groups are introduced into the surface of the non-woven fabric and the fiber pores to obtain a modified non-woven fabric, and then use The sol was prepared by the sol-gel method, and then the sol was coated on the modified non-woven fabric to obtain the non-woven fabric composite separator. The non-woven composite diaphragm prepared by the invention has excellent thermal stability, good air permeability, good electrolyte wettability, and high safety, and is expected to be used in high-energy lithium-ion batteries; the preparation process of the invention is simple, and the equipment requirements Low, easy to realize industrialization.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/414H01M50/446H01M50/449
CPCH01M10/0525H01M50/403H01M50/409Y02E60/10
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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