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Method for coating surface of polyimide nanofiber membrane with boehmite ceramic layer

A nanofiber membrane and polyimide technology, applied in fiber treatment, fiber type, fiber chemical characteristics, etc., can solve the problem of limited improvement of ionic conductivity and thermal stability, increase of separator thickness and quality, decrease of battery energy density, etc. problems, achieve high wettability and thermal stability, reduce mass and thickness, and increase energy density

Active Publication Date: 2021-10-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite separator modified by coating method still has a lot of room for improvement in terms of ionic conductivity and thermal stability: the coating slurry may cause the clogging of the micropores of the separator, which reduces the uniformity of the separator; the coating slurry It will increase the thickness and quality of the separator, resulting in a decrease in the energy density of the battery; the coating slurry only covers the surface of the base film, and has limited improvement in ion conductivity and thermal stability

Method used

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  • Method for coating surface of polyimide nanofiber membrane with boehmite ceramic layer
  • Method for coating surface of polyimide nanofiber membrane with boehmite ceramic layer
  • Method for coating surface of polyimide nanofiber membrane with boehmite ceramic layer

Examples

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Effect test

Embodiment 1

[0038] (1) Take 4.17g of anhydrous aluminum chloride and slowly add it into 80ml of deionized water to make it completely dissolved to make a 0.4mol / L anhydrous aluminum chloride solution; (2) Weigh the homobenzene with a molar ratio of 1:1 Tetraformic dianhydride (PMDA) 2.0g, 4,4'-diaminodiphenyl ether (ODA) 1.84g, all ODA dissolved in 30ml of N,N-dimethylformamide (DMF) solvent, mechanically stirred After the ODA is completely dissolved in DMF, add PMDA in batches under the condition of an ice-water bath to obtain a polyamic acid solution with a moderate viscosity, then mechanically stir for 2 hours to homogenize, and finally put the polyamic acid solution into a 20ml syringe , using electrospinning technology to prepare polyamic acid nanofiber membranes, the specific parameters of the electrospinning process are spinning voltage: 17kV; spinning temperature: room temperature; spinning humidity: 30%; diameter of syringe needle: No. 12; receiving roller Speed: 400rpm; Receivin...

Embodiment 2

[0040] (1) Take 4.17g of anhydrous aluminum chloride and slowly add it into 80ml of deionized water to make it completely dissolved to make a 0.4mol / L anhydrous aluminum chloride solution; (2) Weigh the homobenzene with a molar ratio of 1:1 Tetraformic dianhydride (PMDA) 2.0g, 4,4'-diaminodiphenyl ether (ODA) 1.84g, all ODA dissolved in 30ml of N,N-dimethylformamide (DMF) solvent, mechanically stirred After the ODA is completely dissolved in DMF, add PMDA in batches under the condition of an ice-water bath to obtain a polyamic acid solution with a moderate viscosity, then mechanically stir for 2 hours to homogenize, and finally put the polyamic acid solution into a 20ml syringe , using electrospinning technology to prepare polyamic acid nanofiber membranes, the specific parameters of the electrospinning process are spinning voltage: 17kV; spinning temperature: room temperature; spinning humidity: 30%; diameter of syringe needle: No. 12; receiving roller Speed: 400rpm; Receivin...

Embodiment 3

[0042] (1) Take 4.17g of anhydrous aluminum chloride and slowly add it into 80ml of deionized water to make it completely dissolved to make a 0.4mol / L anhydrous aluminum chloride solution; (2) Weigh the homobenzene with a molar ratio of 1:1 Tetraformic dianhydride (PMDA) 2.0g, 4,4'-diaminodiphenyl ether (ODA) 1.84g, all ODA dissolved in 30ml of N,N-dimethylformamide (DMF) solvent, mechanically stirred After the ODA is completely dissolved in DMF, add PMDA in batches under the condition of an ice-water bath to obtain a polyamic acid solution with a moderate viscosity, then mechanically stir for 2 hours to homogenize, and finally put the polyamic acid solution into a 20ml syringe , using electrospinning technology to prepare polyamic acid nanofiber membranes, the specific parameters of the electrospinning process are spinning voltage: 17kV; spinning temperature: room temperature; spinning humidity: 30%; diameter of syringe needle: No. 12; receiving roller Speed: 400rpm; Receivin...

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Abstract

The invention discloses a polyimide nanofiber membrane with the surface coated with a boehmite ceramic layer. A preparation method comprises the following steps of firstly, preparing a polyamide acid nanofiber membrane through an electrostatic spinning method, and carrying out thermal imidization to obtain a polyimide nanofiber membrane; then sequentially immersing the polyimide nanofiber membrane in a potassium hydroxide solution and a dilute acetic acid solution to carry out alkaline hydrolysis ring opening and acidification, immersing the polyimide nanofiber membrane in ammonia water to carry out quaternization, and immersing the polyimide nanofiber membrane in an aluminum salt solution to carry out in-situ complexation and adsorption hydrolysis; and finally carrying out heat treatment to obtain the polyimide nanofiber membrane with the surface coated with the boehmite ceramic layer. The method disclosed by the invention is simple in implementation process, high in coating efficiency, green and pollution-free in process and beneficial to expanded production.

Description

technical field [0001] The invention belongs to the technical field of polyimide fiber membranes, and in particular relates to a method for coating a boehmite ceramic layer on the surface of a polyimide nanofiber membrane. Background technique [0002] With the continuous acceleration of the development of modern society, the global energy demand is constantly increasing. The huge environmental pressure brought by traditional fossil energy and the severe situation brought about by its continuous consumption have become social problems that cannot be ignored, and the research and development of new energy is imminent. Lithium battery has become one of the most potential energy storage devices due to its high energy density and low pollution characteristics. However, with the continuous promotion of the application of lithium batteries, spontaneous combustion and explosions of batteries that occur from time to time have become the focus of social attention. Battery safety is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/45D06M11/60D06M11/38D06M13/188D01F6/74D04H1/4334D04H1/728D06M101/30
CPCD06M11/45D06M11/60D06M11/38D06M13/188D01F6/74D04H1/4334D04H1/728D06M2101/30Y02E60/10
Inventor 齐胜利杨承沅董南希田国峰武德珍
Owner BEIJING UNIV OF CHEM TECH
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