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
CN113462012AInactive Publication Date: 2021-10-01UNIV OF SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH OF CHINA
Publication Date
2021-10-01
Estimated Expiration
Not applicable · inactive patent

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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.
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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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