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High breathable polymer coated diaphragm as well as preparation method and application thereof

A polymer and gas-permeable technology, which is applied in the field of highly gas-permeable polymer-coated diaphragm and its preparation, can solve the problems of occupying the internal space of the battery, increasing the weight and thickness of the diaphragm, and unfavorable energy density of lithium-ion batteries. Improvement of cycle performance and rate performance, improvement of performance, effect of small increase

Inactive Publication Date: 2018-11-13
湖南烁普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it significantly increases the weight and thickness of the separator, occupies the internal space of the battery, and is not conducive to improving the energy density of lithium-ion batteries.

Method used

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  • High breathable polymer coated diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add fatty alcohol polyoxyethylene ether to deionized water to prepare a wetting solution with a mass fraction of fatty alcohol polyoxyethylene ether of 3%.

[0046] Soak one side of the polyethylene porous membrane in the wetting solution for 3 minutes to obtain a wet polyethylene porous membrane.

[0047] Mix polyvinylidene fluoride, cellulose, polyvinylpyrrolidone, and nitrogen methyl formamide at a ratio of 1:1:0.54:7.7, stir at 60°C for 8 hours, and let stand for 12 hours to remove air bubbles to obtain a casting solution.

[0048] The casting liquid is coated on the wetted polyethylene porous membrane to obtain a wet membrane. The coating thickness of the wet film was 1 micron.

[0049] Soak the wet film in an aqueous solution with a mass fraction concentration of fatty acid polyoxyethylene ether of 8%, to obtain a primary film.

[0050] Soak the as-formed film in deionized water for 3 days, and dry it at 60°C to obtain a highly gas-permeable polymer-coated separ...

Embodiment 2

[0054] Add fluoroalkyl methoxy ether alcohol to deionized water to prepare a wetting solution with a mass fraction of fluoroalkyl methoxy ether alcohol of 5%.

[0055] Soak one side of the polypropylene porous membrane in the wetting solution for 10 seconds to obtain a wet polypropylene porous membrane.

[0056] Mix polyacrylonitrile, lithium chloride, triethyl phosphate and dimethyl sulfoxide at a ratio of 1:0.025:2:2.75, stir at 50°C for 18 hours, and let stand for 12 hours to remove air bubbles to obtain a casting solution.

[0057] The casting solution was coated on the wet polypropylene porous membrane to obtain a wet membrane. The coating thickness of the wet film was 50 microns.

[0058] Soak the wet film in an aqueous solution with a mass fraction of 5% fluoroalkyl methoxy ether alcohol to obtain a primary film.

[0059] Soak the as-formed film in deionized water for 7 days, and dry it at 50°C to obtain a highly air-permeable polymer-coated separator.

[0060] The d...

Embodiment 3

[0063] Alkylphenol polyoxyethylene ether was added to deionized water to prepare a wetting solution with a mass fraction of alkylphenol polyoxyethylene ether of 1%.

[0064] Soak one side of the polyimide porous membrane in the wetting solution for 5 minutes to obtain a wet polyimide porous membrane.

[0065] Mix polymethylmethacrylate, polyvinylpyrrolidone, polyethylene glycol and dimethylacetamide at a ratio of 1:0.082:0.091:8.95, stir at 80°C for 3 hours, and let it stand for 12 hours to remove air bubbles to obtain a casting Membrane fluid.

[0066] Coating the casting solution on the wet polyimide porous membrane to obtain a wet membrane. The coating thickness of the wet film was 10 microns.

[0067] Soak the wet film in an aqueous solution with a mass fraction of fluoroalkyl ethoxy ether alcohol of 0.1% to obtain a primary film.

[0068] Soak the as-formed film in deionized water for 5 days, and dry it at 80°C to obtain a highly air-permeable polymer-coated separator....

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Abstract

The invention provides a high breathable polymer coated diaphragm as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, soaking one side of a base membrane in wetting liquid for pre-wetting and coating the other side of the base membrane with casting film liquid; secondly, soaking by using a modified coagulation bath to extract a solvent in the coating membrane and enabling the coating layer surface of an initial membrane to form uniform cavernous holes; soaking, washing and drying for removing water to obtain the high breathable polymer coated diaphragm. The polymer coated diaphragm prepared by the preparation method provided by the invention has the advantages of high porosity, uniform hole distribution on the surface of the coating and capability of significantly improving the comprehensive performance of a lithium-ion battery separator.

Description

technical field [0001] The invention relates to the technical field of battery diaphragm materials, in particular to a highly gas-permeable polymer-coated diaphragm and its preparation method and application. Background technique [0002] As an energy storage device, lithium-ion batteries are considered to be one of the first choices for replacing petrochemical energy due to their high energy density, high operating voltage, long cycle life, renewability, and environmental friendliness, and have been successfully applied in every aspect of our lives. From small electronic devices, mobile phones, tablet computers, to new energy vehicles, there are lithium-ion batteries. However, with the development of lithium batteries in the direction of power sources, the demand for high energy density, high cycle performance and high working voltage is increasing. At the same time, power batteries have higher and higher requirements for diaphragm performance. [0003] The polymer-coated...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 吴秀锋钟海燕张杨肖欢张鹏孙先维雷建清蔡滔罗建
Owner 湖南烁普新材料有限公司
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