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Polyimide/polyetherimide composite membrane and preparation method thereof

A technology of polyetherimide and polyetherimide layer, which is applied in the field of polyimide/polyetherimide composite membrane and its preparation, and can solve problems such as high cost, large pore size of fiber membrane, and complicated process , to achieve enhanced mechanical properties, good flame retardancy, and stable pore structure

Pending Publication Date: 2021-11-26
BEIJING YUCHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the loose packing characteristics of the nanofibers in the membrane, they lack strong interactions, resulting in insufficient mechanical properties of the membrane, and the large pore size of the fiber membrane may cause self-discharge or even Potential risks such as short circuit
In order to improve the performance of the fiber membrane, in patent 202010713486.9, the polyamic acid solution is coated on the polyimide nanofiber membrane to obtain a composite membrane, and then the composite membrane is immersed in a chemical imidization reagent to obtain a chemical imidization. An all-polyimide composite diaphragm; the all-polyimide composite diaphragm is subjected to heat treatment to decompose the pore-forming agent to obtain a double-structure polyimide composite battery diaphragm. Although the diaphragm obtained by this method has better performance, the The process is complicated and the cost is high

Method used

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  • Polyimide/polyetherimide composite membrane and preparation method thereof
  • Polyimide/polyetherimide composite membrane and preparation method thereof
  • Polyimide/polyetherimide composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, a PMDA / ODA system polyamic acid solution with a solid content of 12% was prepared, a polyamic acid nanofiber membrane was prepared by electrospinning, and a polyimide nanofiber membrane was obtained by thermal imidization.

[0036](1) Weigh 2.03g of pyromellitic dianhydride (PMDA) and 1.84g of 4,4'-diaminodiphenyl ether (ODA) at a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N- After being completely dissolved in dimethylformamide (DMF) solvent, PMDA was added in batches to prepare a polyamic acid solution with a solid content of 12%. The polyamic acid solution is prepared by electrospinning technology to prepare polyamic acid nanofiber membrane. The specific parameters of the electrospinning machine are: spinning voltage: 20kV; spinning temperature: 25°C; spinning humidity: 40%; syringe needle diameter: 12 No.; receiving roller speed: 500r / min; receiving distance: 20cm. The prepared PAA nanofiber membrane was subjected to thermal imidization treatment,...

Embodiment 2

[0041] First, a PMDA / ODA system polyamic acid solution with a solid content of 12% was prepared, a polyamic acid nanofiber membrane was prepared by electrospinning, and a polyimide nanofiber membrane was obtained by thermal imidization.

[0042] (1) Weigh 2.03g of pyromellitic dianhydride (PMDA) and 1.84g of 4,4'-diaminodiphenyl ether (ODA) at a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N- After being completely dissolved in dimethylformamide (DMF) solvent, PMDA was added in batches to prepare a polyamic acid solution with a solid content of 12%. The polyamic acid solution is prepared by electrospinning technology to prepare polyamic acid nanofiber membrane. The specific parameters of the electrospinning machine are: spinning voltage: 20kV; spinning temperature: 25°C; spinning humidity: 40%; syringe needle diameter: 12 No.; receiving roller speed: 500r / min; receiving distance: 20cm. The prepared PAA nanofiber membrane was subjected to thermal imidization treatment...

Embodiment 3

[0047] First, a PMDA / ODA system polyamic acid solution with a solid content of 12% was prepared, a polyamic acid nanofiber membrane was prepared by electrospinning, and a polyimide nanofiber membrane was obtained by thermal imidization.

[0048] (1) Weigh 2.03g of pyromellitic dianhydride (PMDA) and 1.84g of 4,4'-diaminodiphenyl ether (ODA) at a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N- After being completely dissolved in dimethylformamide (DMF) solvent, PMDA was added in batches to prepare a polyamic acid solution with a solid content of 12%. The polyamic acid solution is prepared by electrospinning technology to prepare polyamic acid nanofiber membrane. The specific parameters of the electrospinning machine are: spinning voltage: 20kV; spinning temperature: 25°C; spinning humidity: 40%; syringe needle diameter: 12 No.; receiving roller speed: 500r / min; receiving distance: 20cm. The prepared PAA nanofiber membrane was subjected to thermal imidization treatment...

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Abstract

The invention provides a polyimide nanofiber / polyetherimide composite membrane and a preparation method thereof. The preparation method comprises the following steps: synthesizing polyamide acid (PAA) as a spinning solution by taking diamine and dianhydride as monomers; carrying out electrostatic spinning on the PAA solution, and then carrying out high-temperature cyclization to obtain a PI nanofiber membrane; and uniformly coating the surface of the PI nanofiber membrane with a prepared polyetherimide (PEI) solution, and forming a porous structure due to phase separation to obtain the PI / PEI composite porous membrane. The method is easy and convenient to implement and low in cost, and the mechanical strength of the fiber membrane is greatly improved due to introduction of PEI. And meanwhile, the flame retardance of the composite film is greatly improved, and a thermal hole closing phenomenon also occurs at a high temperature, so that the use safety of a battery at the high temperature is ensured. The PI / PEI composite membrane 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 / polyetherimide composite membrane and a preparation method thereof. Background technique [0002] In recent years, with the rapid popularization of high-power electrical equipment such as new energy vehicles, high-safety lithium-ion batteries have become a research hotspot. The separator, known as the "third electrode," plays a key role in the manufacture of batteries. Currently the main commercial separators are polyolefin separators. However, due to the low melting point and poor thermal stability of polyolefins, it is very dangerous to operate the battery at high temperature, and even explode. In addition, this separator is a non-polar material, which has poor wettability with polar electrolytes, resulting in low battery ionic conductivity, which reduces the overall performance of the battery. It is of great significance to actively develop a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/423H01M10/0525H01M50/403H01M50/44H01M50/449H01M50/489H01M50/491
CPCH01M50/403H01M50/423H01M50/44H01M50/449H01M50/489H01M50/491H01M10/0525Y02E60/10
Inventor 王杰贾南方
Owner BEIJING YUCHENG TECH CO LTD
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