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Coaxial aluminum oxide coated polyimide nanofiber membrane and preparation method thereof

A nanofiber membrane, aluminum oxide technology, applied in fiber type, fiber treatment, ultrasonic/sonic fiber treatment, etc., can solve the problems of poor electrolyte wettability, reduce electrolyte wettability of diaphragm, and reduce battery energy density. , to achieve the effects of excellent surface wettability, excellent electrolyte wettability, and thin functional layer thickness

Active Publication Date: 2020-07-28
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, although the electrolyte wettability of the separator has been greatly improved after the coating treatment, there are still parts with poor electrolyte wettability (polymer base film) in the multilayer structure of the coated separator. The presence of the electrolyte will reduce the wettability of the separator; in addition, the increase in the thickness of the separator by coating the inorganic layer will further reduce the energy density of the battery

Method used

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  • Coaxial aluminum oxide coated polyimide nanofiber membrane and preparation method thereof
  • Coaxial aluminum oxide coated polyimide nanofiber membrane and preparation method thereof
  • Coaxial aluminum oxide coated polyimide nanofiber membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035](1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.84g 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, stir mechanically, after ODA is completely dissolved in DMF, add PMDA in batches under ice-water bath conditions; after obtaining the polyamic acid solution with moderate viscosity, then mechanically stir for 2h to homogenize, Finally, the polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber membrane was prepared by electrospinning technology. The specific parameters of the electrospinning process were spinning voltage: 17kV; spinning temperature: room temperature; spinning humidity: 30%; syringe needle diameter: No. 12; receiving roller speed: 400rpm; receiving distance: 20cm. The prepared polyamic acid fiber membrane was placed in a clean bench for 12h; (2) the polyamic acid nanofiber membrane prepared in step (1) was rinsed with oxygen plasma f...

Embodiment 2

[0037] (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.84g 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, stir mechanically, after ODA is completely dissolved in DMF, add PMDA in batches under ice-water bath conditions; after obtaining the polyamic acid solution with moderate viscosity, then mechanically stir for 2h to homogenize, Finally, the polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber membrane was prepared by electrospinning technology. The specific parameters of the electrospinning process were spinning voltage: 17kV; spinning temperature: room temperature; spinning humidity: 30%; syringe needle diameter: No. 12; receiving roller speed: 400rpm; receiving distance: 20cm. The prepared polyamic acid fiber membrane was placed in a clean bench for 12h; (2) the polyamic acid nanofiber membrane prepared in step (1) was rinsed with oxygen plasma ...

Embodiment 3

[0039] (1) Weigh 2.0g of 3,3',4,4'-benzophenonetetraacid dianhydride (BTDA) and 1.24g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1 , Dissolve all ODA in 30ml of N,N-dimethylformamide (DMF) solvent, stir mechanically, after all ODA is dissolved in DMF, add BTDA in batches under ice-water bath conditions; obtain polyamide with moderate viscosity After the acid solution, mechanically stir for 2 hours to homogenize, and finally put the polyamic acid solution into a 20ml syringe, and use the electrospinning technology to prepare the polyamic acid fiber membrane. The specific parameters of the electrospinning process are spinning voltage: 17kV; Spinning temperature: room temperature; spinning humidity: 30%; syringe needle diameter: No. 12; receiving roller speed: 400 rpm; receiving distance: 20 cm. The prepared polyamic acid fiber membrane was placed in a clean bench for 12h; (2) the polyamic acid nanofiber membrane prepared in step (1) was rinsed with oxygen plasma...

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Abstract

The invention discloses a coaxial aluminum oxide coated polyimide nanofiber membrane. A preparation method of the coaxial aluminum oxide coated polyimide nanofiber membrane comprises the steps that apolyamide acid nanofiber membrane is firstly prepared through an electrostatic spinning method and then is modified, then the polyamide acid nanofiber membrane is fixed through a clamp and is spread in a closed container in a suspended manner, aluminum isopropoxide powder is paved at the bottom of the closed container, the container is vacuumized, heating is carried out at a certain temperature for a certain time duration to achieve chemical vapor deposition, and finally the coaxial aluminum oxide coated polyimide nanofiber membrane is obtained through heating treatment. The coaxial aluminum oxide coated polyimide nanofiber membrane is thin in function layer and excellent in thermal stability, the electrolyte wetting speed is high, wettability is good, and the coaxial aluminum oxide coatedpolyimide nanofiber membrane has good application prospects by serving as a high-safety lithium battery membrane. The preparation process is efficient and safe, and huge industrial production potential is achieved.

Description

technical field [0001] The invention belongs to the technical field of polyimide fiber membranes, in particular to a polyimide nanofiber membrane coaxially coated with aluminum oxide and a preparation method thereof. Background technique [0002] With the continuous consumption of traditional fossil fuels and the continuous enhancement of people's awareness of environmental protection, lithium-ion batteries with the advantages of environmental protection, long service life, and wide operating temperature range have become one of the most important energy storage devices in the future. As the "third electrode", the separator plays a role in preventing direct contact between the positive and negative electrodes of the battery. It plays an important role in the battery work, and its performance has a direct impact on battery performance. Separator material research is the focus of battery research in recent years. [0003] Electrospinning is also called electrospinning. In rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D04H1/728D06M11/45D06M10/02D06C7/00D04H1/4326D06M101/30
CPCD01D5/003D04H1/728D06M11/45D06M10/025D06C7/00D04H1/4326D06M2101/30Y02E60/10
Inventor 齐胜利杨承沅董南希田国峰武德珍
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH