A kind of aromatic polyamide slurry, porous diaphragm and preparation method thereof

An aramid and slurry technology, applied in structural parts, battery pack parts, electrical components, etc., can solve the problems of difficult control of pore size uniformity, high water absorption rate of porous membrane, uneven pore size, etc. Reduction of core capacity and cycle performance, reduction of suppression capacity and cycle performance, good effect of pore size uniformity
CN109950456BActive Publication Date: 2022-01-18微宏先进膜公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
微宏先进膜公司
Publication Date
2022-01-18

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Abstract

The invention provides an aromatic polyamide slurry, which comprises the following raw materials: 15-30wt% aromatic polyamide compound, 2-15wt% reactive additives and 59-82wt% solvent, and 0.5-7wt% co-solvent can be added to the aromatic polyamide slurry, and a porous diaphragm prepared by using the aromatic polyamide slurry and a preparation method thereof are also provided. The aromatic polyamide porous diaphragm prepared by the present invention has high temperature resistance, good pore size uniformity and low moisture content, and can effectively improve the safety performance of the battery cell when applied to a lithium-ion battery while suppressing the cell capacity and degradation of cycle characteristics.
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Description

technical field

[0001] The invention relates to the field of aromatic polyamide slurry, in particular to an aromatic polyamide slurry, a porous diaphragm and a preparation method thereof. Background technique

[0002] At present, lithium battery separators are mainly porous films based on polyolefins, including PE separators, PP and PE multiple composite separators, and coated separators coated with inorganic ceramic materials, but are limited by polyolefin substrates. There is no fundamental difference in the fusing temperature of these types of diaphragms. With the increasing demand for the development of large-capacity lithium-ion power batteries, it is important to develop a new type of temperature-resistant lithium-ion diaphragm to promote the further development of lithium-ion batteries. meaning.

[0003] Aramid (PPTA, PMIA, PBA, PSA) has a glass transition temperature of about 300°C, a thermal decomposition temperature greater than 500°C, and has the advantages of hi...

Claims

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