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Cerium dioxide coated polyimide composite nanofiber membrane and preparation method thereof

A technology of composite nanofibers and nanofiber membranes, which is applied in the direction of fiber types, fiber treatment, flame-retardant fibers, etc., can solve the problem of difficulty in ensuring high-rate charge-discharge performance and high-temperature resistance of batteries, restricting the development of lithium-ion batteries, and electrolyte solutions. Poor wettability and other problems, to achieve the effect of high strength, excellent high temperature resistance, good electrolyte wettability

Pending Publication Date: 2022-01-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of people's requirements for battery energy density, battery life, and especially battery safety, polyolefin separators have exposed some significant shortcomings, and their low thermal transformation temperature seriously affects battery safety. Restricted the development of lithium-ion batteries
Traditional battery separators use polyolefin as a raw material, which has poor electrolyte wettability and poor thermal stability, making it difficult to ensure high-rate charge-discharge performance and high-temperature resistance of the battery

Method used

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  • Cerium dioxide coated polyimide composite nanofiber membrane and preparation method thereof
  • Cerium dioxide coated polyimide composite nanofiber membrane and preparation method thereof
  • Cerium dioxide coated polyimide composite nanofiber membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Prepare PMDA / ODA system polyamic acid nanofiber membrane, first place it in 0.1mol / L ceria precursor solution for 60min, add 5ml hydrogen peroxide, and then heat-treat to obtain ceria-coated polyimide composite nanofibrous membrane. (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N - in dimethylformamide (DMF) solvent, mechanically stirred, after ODA is all dissolved in DMF, under the condition of ice-water bath, add PMDA step by step, after obtaining the polyamic acid solution with moderate viscosity, after mechanically stirring for 2h, put The polyamic acid solution is put into a 20ml syringe, and the polyamic acid fiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 29kV; spinning temperature: room temperature; spinning humidity: 30%; Syringe needle diameter: No. 18; Receiving roller...

Embodiment 2

[0041] Prepare PMDA / ODA system polyamic acid nanofiber membrane, first place it in 0.1mol / L ceria precursor solution for 30min, add 5ml hydrogen peroxide, and then heat-treat to obtain ceria-coated polyimide composite nanofibrous membrane. (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N - in dimethylformamide (DMF) solvent, mechanically stirred, after ODA is all dissolved in DMF, under the condition of ice-water bath, add PMDA step by step, after obtaining the polyamic acid solution with moderate viscosity, after mechanically stirring for 2h, put The polyamic acid solution is put into a 20ml syringe, and the polyamic acid fiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 29kV; spinning temperature: room temperature; spinning humidity: 30%; Syringe needle diameter: No. 18; Receiving roller...

Embodiment 3

[0045] To prepare PMDA / ODA system polyamic acid nanofiber membrane, first place it in 0.1mol / L ceria precursor solution for 10min, add 5ml hydrogen peroxide, and then heat-treat to obtain ceria-coated polyimide composite nanofibrous membrane. (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N - in dimethylformamide (DMF) solvent, mechanically stirred, after ODA is all dissolved in DMF, under the condition of ice-water bath, add PMDA step by step, after obtaining the polyamic acid solution with moderate viscosity, after mechanically stirring for 2h, put The polyamic acid solution is put into a 20ml syringe, and the polyamic acid fiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 29kV; spinning temperature: room temperature; spinning humidity: 30%; Syringe needle diameter: No. 18; Receiving rol...

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Abstract

The invention discloses a cerium dioxide coated polyimide composite nanofiber membrane and a preparation method thereof. The preparation method comprises the following steps of firstly, preparing a polyamide acid nanofiber membrane by adopting an electrostatic spinning method, then putting the polyamide acid nanofiber membrane into a cerium dioxide precursor solution, then treating the polyamide acid nanofiber membrane with hydrogen peroxide, and finally carrying out gradient heating treatment to obtain the polyimide nanofiber membrane coated with a cerium dioxide nanolayer on the surface. The mechanical property, thermal dimensional stability, wettability and high temperature resistance of the polyimide nanofiber membrane are improved through coating of the cerium dioxide nanolayer. The method disclosed by the invention is simple in operation process, easy to processize and relatively high in production efficiency, and the composite nanofiber membrane can effectively overcome the defects of insufficient mechanical property of the nanofiber membrane and insufficient flexibility of an inorganic ceramic, fully combines the advantages of polyimide and the inorganic ceramic, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and relates to a ceria-coated polyimide composite nanofiber membrane and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the most potential green energy sources due to their advantages of high energy density and low environmental pollution. However, traditional lithium-ion batteries have gradually been unable to meet the rapidly growing social needs in terms of high-rate charge-discharge performance and high-temperature resistance. In the battery structure, the battery separator plays the role of preventing the positive and negative electrodes from contacting each other and providing ion transmission channels. The performance of the battery separator is an important determinant of battery performance. Polyolefin separators are the first to occupy the lithium-ion battery separator market due to their high mechanical streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/46D04H1/728D04H1/4326D06M101/30
CPCD06M11/46D04H1/728D04H1/4326D06M2101/30D06M2200/30
Inventor 齐胜利刘克凡李小刚田国峰武德珍
Owner BEIJING UNIV OF CHEM TECH