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Flexible linear high-temperature-resistant polyimide aerogel battery diaphragm, preparation method thereof and lithium ion battery

A polyimide, battery separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as limited porosity, achieve a small average pore size, ensure uniformity and integrity, and uniform pores. Effect

Inactive Publication Date: 2021-10-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of polyimide membrane reported so far, the method of thermal imidization is used, which requires the use of pore-forming agents or the creation of pores in the spinning process, and the porosity is limited.

Method used

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  • Flexible linear high-temperature-resistant polyimide aerogel battery diaphragm, preparation method thereof and lithium ion battery
  • Flexible linear high-temperature-resistant polyimide aerogel battery diaphragm, preparation method thereof and lithium ion battery
  • Flexible linear high-temperature-resistant polyimide aerogel battery diaphragm, preparation method thereof and lithium ion battery

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preparation example Construction

[0042] The invention provides a method for preparing a flexible linear high-temperature-resistant polyimide airgel battery diaphragm, comprising the following steps:

[0043] A) mixing diamine monomers and dianhydride monomers in an organic solvent to obtain a polyamic acid solution;

[0044] B) adding a bis(trimethoxysilylpropyl)amine crosslinking agent to the polyamic acid solution for chemical crosslinking, and then adding a dehydrating agent and a catalyst to obtain a polyimide solution;

[0045] C) coating the polyimide solution on the surface of the substrate to obtain a polyimide wet gel film, and then aging;

[0046] D) placing the aged film in an organic solvent for solvent exchange, and then performing supercritical fluid drying to obtain a polyimide airgel battery separator.

[0047] In the present invention, the polyamic acid solution is firstly prepared, and the diamine monomer is dissolved in an organic solvent, ultrasonically oscillated or rapidly stirred until...

Embodiment 1

[0083] In this embodiment, polyimide airgel film is first prepared, and the specific steps are as follows:

[0084] 1) Preparation of polyamic acid solution: Dissolve diamine monomer 4,4'-diaminodiphenyl ether (ODA) in N-methylpyrrolidone (NMP), ultrasonically shake or stir rapidly at room temperature until dissolved, and then Add dianhydride monomer 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), and stir rapidly to prepare a polyamic acid solution. After the BPDA is dissolved, stir rapidly to prepare a polyamic acid solution. The molar ratio of ODA and BPDA is 1:1.03; the solid content is 15%.

[0085] 2) Preparation of polyimide solution: Add a certain amount of cross-linking agent BTMSPA to the polyamic acid solution obtained in step 1), the molar ratio of cross-linking agent to ODA is 1:45; stir rapidly for about half an hour. Then add dehydrating agent acetic anhydride and catalyst, the molar ratio of acetic anhydride, pyridine and BPDA is 8:8:1, oscillate or sti...

Embodiment 2

[0100] 1) Preparation of polyamic acid solution: Dissolve diamine monomer 4,4'-diaminodiphenyl ether (ODA) in N-methylpyrrolidone (NMP), ultrasonically shake or stir rapidly at room temperature until dissolved, and then Add dianhydride monomer 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), and stir rapidly to prepare a polyamic acid solution. After the BPDA is dissolved, stir rapidly to prepare a polyamic acid solution. The molar ratio of ODA and BPDA is 1:1.03; the solid content is 15%.

[0101] 2) Preparation of polyimide solution: Add a certain amount of cross-linking agent BTMSPA to the polyamic acid solution obtained in step 1), the molar ratio of cross-linking agent to ODA is 1:45; stir rapidly for about half an hour. Then add dehydrating agent acetic anhydride and catalyst, the molar ratio of acetic anhydride, pyridine and BPDA is 8:8:1, oscillate or stir evenly, and eliminate bubbles by ultrasonic to obtain polyimide solution. The solids content was 15%.

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Abstract

The invention provides a preparation method of a flexible linear high-temperature-resistant polyimide aerogel battery diaphragm, which comprises the following steps: A) mixing a diamine monomer and a dianhydride monomer in an organic solvent to obtain a polyamide acid solution; B) adding a bis(trimethoxysilylpropyl) amine cross-linking agent into the polyamide acid solution for chemical cross-linking, and then adding a dehydrating agent and a catalyst to obtain a polyimide solution; C) coating the surface of a base material with the polyimide solution to obtain a polyimide wet gel film, and then aging; and D) placing the aged film in an organic solvent for solvent exchange, and then carrying out supercritical fluid drying to obtain the polyimide aerogel battery diaphragm. The invention also provides a flexible linear high-temperature-resistant polyimide aerogel battery diaphragm and a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a flexible linear high-temperature-resistant polyimide airgel battery diaphragm, a preparation method thereof and a lithium-ion battery. Background technique [0002] Lithium-ion rechargeable batteries have achieved great success in mobile electronics, electric vehicles, and electrical energy storage. While lithium-ion batteries benefit mankind, they also have potential dangers. Frequent combustion and explosion accidents of lithium-ion batteries have brought great threats to people's lives and property safety. Separators play a key role in lithium batteries, acting as electronic isolation barriers between electrodes to avoid internal short circuits and greatly affect the safety and electrochemical performance of batteries. Most of the separators used are polyolefin-based separators, including polypropylene and polyethylene, which have high flammability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08L79/08C08K5/544H01M50/403H01M50/423H01M10/0525
CPCC08J9/286C08J9/0042C08J5/18H01M50/403H01M50/423H01M10/0525C08J2205/026C08J2379/08C08K5/544C08J2205/042Y02E60/10
Inventor 张和平邓玉睿龚伦伦程旭东潘月磊
Owner UNIV OF SCI & TECH OF CHINA
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