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

Method used

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

Examples

Experimental program
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Example Embodiment

[0044] Example 1

[0045] The fatty alcohol polyoxyethylene ether is added to deionized water to prepare a 3% wetting solution with the fatty alcohol polyoxyethylene ether mass fraction.

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

[0047] The polyvinylidene fluoride, cellulose, polyvinylpyrrolidone and nitrogen methyl formamide were mixed in a ratio of 1:1:0.54:7.7, stirred at 60° C. for 8 hours, and allowed to stand for 12 hours to remove bubbles to obtain a casting solution.

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

[0049] The wet film is immersed in an aqueous solution with a mass fraction of fatty acid polyoxyethylene ether of 8% to obtain a preliminary film.

[0050] The pre-formed film was immersed in deionized water for 3 days and dried at 60°C to obtain a highly breatha...

Example Embodiment

[0053] Example 2

[0054] The fluorinated alkyl methoxy ether alcohol is added to deionized water to prepare a wetting solution with the fluorinated alkyl methoxy ether alcohol content of 5%.

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

[0056] The polyacrylonitrile, lithium chloride, triethyl phosphate and dimethyl sulfoxide were mixed in a ratio of 1:0.025:2:2.75, stirred at 50° C. for 18 hours, and left standing for 12 hours to remove bubbles to obtain a casting solution.

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

[0058] The wet film is immersed in a 5% aqueous solution of fluoroalkyl methoxy ether alcohol to obtain a preliminary film.

[0059] The pre-formed film was immersed in deionized water for 7 days and dried at 50°C to obtain a highly breathable polymer-coated me...

Example Embodiment

[0062] Example 3

[0063] The alkylphenol polyoxyethylene ether is added into deionized water to prepare a wetting solution with a mass fraction of the alkylphenol polyoxyethylene ether of 1%.

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

[0065] The polymethyl methacrylate, polyvinylpyrrolidone, polyethylene glycol and dimethylacetamide were mixed in the ratio of 1:0.082:0.091:8.95, stirred at 80°C for 3h, and left standing for 12h to remove air bubbles to obtain a cast Membrane fluid.

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

[0067] The wet film is immersed in an aqueous solution with a mass fraction of fluoroalkyl ethoxy ether alcohol of 0.1% to obtain a preliminary film.

[0068] The pre-formed film was immersed in deionized water for 5 days and dried at 80°C to obtain a highly...

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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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