Polyimide/zinc oxide composite lithium ion battery diaphragm and preparation method thereof

A polyimide and ion battery technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of reducing battery power density, reducing ion conductivity, reducing porosity, etc., and achieves low cost and high efficiency. Wetting, cost and environmental protection effect

Pending Publication Date: 2021-11-30
BEIJING YUCHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these ceramic-based coatings, when coated on conventional porous PE membranes, can block pores or reduce porosity, which reduces their ionic conductivity and ultimately reduces the power density of the battery

Method used

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  • Polyimide/zinc oxide composite lithium ion battery diaphragm and preparation method thereof
  • Polyimide/zinc oxide composite lithium ion battery diaphragm and preparation method thereof
  • Polyimide/zinc oxide composite lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh 2.03g of pyromellitic dianhydride (PMDA) and 1.84g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, turn on mechanical stirring, and dissolve ODA in 30ml In the N,N-dimethylformamide (DMF) solvent, after being completely dissolved, under the condition of ice-water bath, PMDA was added in batches, and the mechanical stirring was continued until the axial wrapping effect appeared, to obtain a polymer with a solid content of 12%. Amic acid solution. (2) The polyamic acid solution is packed into a 20ml syringe, and the polyamic acid nanofiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 20kV; spinning temperature: room temperature; Humidity: 40%; Syringe needle diameter: No. 12; Receiving roller speed: 500r / min; Receiving distance: 20cm. The prepared polyamic acid nanofiber membrane was dried in an ultra-clean bench for 12 hours. (3) Weigh 2.73g of zinc chloride, dissol...

Embodiment 2

[0033](1) Weigh 2.62g of pyromellitic dianhydride (PMDA) and 2.38g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, turn on mechanical stirring, and dissolve ODA in 30ml In the N,N-dimethylformamide (DMF) solvent, after being completely dissolved, under the condition of ice-water bath, PMDA was added in batches, and the mechanical stirring was continued until the axial wrapping effect appeared, so that the polymer with a solid content of 15% was obtained. Amic acid solution. (2) The polyamic acid solution is packed into a 20ml syringe, and the polyamic acid nanofiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 20kV; spinning temperature: room temperature; Humidity: 40%; Syringe needle diameter: No. 12; Receiving roller speed: 500r / min; Receiving distance: 20cm. The prepared polyamic acid nanofiber membrane was dried in an ultra-clean bench for 12 hours. (3) Weigh 2.04g of zinc chlo...

Embodiment 3

[0037] (1) Weigh 2.67g of 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA) and 1.20g of 4,4'-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and turn on the machine Stir, dissolve all the ODA in 30ml of N,N-dimethylformamide (DMF) solvent. After it is completely dissolved, add 6FDA in batches under the condition of ice-water bath, and continue mechanical stirring until the axial wrapping effect occurs. A polyamic acid solution with a solid content of 12% was obtained. (2) The polyamic acid solution is packed into a 20ml syringe, and the polyamic acid nanofiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 25kV; spinning temperature: room temperature; Humidity: 40%; syringe needle diameter: No. 12; receiving roller speed: 500r / min; receiving distance: 20cm. The prepared polyamic acid nanofiber membrane was dried in an ultra-clean bench for 12 hours. (3) Take by weighing 1.37g of zin...

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Abstract

The invention provides a preparation method of a polyimide / zinc oxide composite lithium ion battery diaphragm. According to the method,Zn < 2 + > metal ions are introduced onto polyamide acid (PAA) fibers by adopting an ion exchange method, and subsequent heat treatment is performed to simultaneously realize the imidization of the PAA and the formation of ZnO nanoparticles. The method comprises the following steps of: synthesizing PAA by taking diamine and dianhydride as monomers, and carrying out electrostatic spinning by taking the PAA as a spinning solution to obtain a PAA nanofiber membrane; then preparing a zinc salt solution with a certain concentration, immersing the PAA nanofiber membrane into the zinc salt solution for a period of time for ion exchange, and performing cleaning; and finally, carrying out thermal imidization to obtain a polyimide / zinc oxide composite nanofiber membrane. The method is simple and low in cost; the surface of the polyimide nanofiber membrane is coaxially coated with zinc oxide, so that the wettability of a diaphragm electrolyte is improved, and the flame retardance of the diaphragm electrolyte is effectively improved; and the method has a wide application prospect in the field of novel lithium ion battery diaphragms.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and relates to a polyimide / zinc oxide composite lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] Today, lithium-ion batteries are the most competitive power source for electric vehicles and hybrid electric vehicles because of their excellent properties such as high energy density, no memory effect, long cycle life and environmental friendliness. Generally, lithium-ion batteries are mainly composed of electrodes, electrolytes and separators. As one of the key components of lithium-ion batteries, the separator plays the role of preventing direct contact between the anode and the cathode and providing a channel for ion transport. At present, the commercial separators used in lithium-ion batteries are mostly porous polyolefin separators, such as polyethylene (PE), polypropylene (PP) and their composite separators. However, due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/423H01M10/0525H01M50/403H01M50/431H01M50/44H01M50/446
CPCH01M50/403H01M50/423H01M50/431H01M50/44H01M50/446H01M10/0525Y02E60/10
Inventor 王杰贾南方
Owner BEIJING YUCHENG TECH CO LTD
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