High-temperature-resistant lithium ion battery diaphragm as well as preparation method and application thereof

A lithium-ion battery and high-temperature-resistant technology, which is applied in the field of lithium-ion batteries, can solve the problems of difficulty in ensuring flame retardancy, poor coating of polyolefin separators, and peeling of coatings, and achieve good thermal stability and flame retardancy. Strong, good compatibility

Pending Publication Date: 2021-08-06
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the flame-retardant modified material of the polyolefin separator is a flame-retardant inorganic material, which has poor coating performance on the polyolefin separator. Therefore, under the long-term infiltration of the electrolyte, the coating is prone to peeling off. Difficult to guarantee

Method used

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  • High-temperature-resistant lithium ion battery diaphragm as well as preparation method and application thereof
  • High-temperature-resistant lithium ion battery diaphragm as well as preparation method and application thereof
  • High-temperature-resistant lithium ion battery diaphragm as well as preparation method and application thereof

Examples

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preparation example Construction

[0050] Another embodiment of the present invention also provides a method for preparing the above-mentioned high-temperature-resistant lithium-ion battery separator, including the following steps:

[0051] The polymer is dissolved in an organic solvent, uniformly coated on the surface of the substrate, and dried to obtain a high-temperature resistant lithium-ion battery separator.

[0052] The preparation method of the above-mentioned high-temperature-resistant lithium-ion battery diaphragm has simple operation and low cost, and can realize large-scale production, and the prepared high-temperature-resistant lithium-ion battery diaphragm has good stability and flame-retardant performance.

[0053] In some of the embodiments, the quaternized polymethyl vinyl ether-maleic anhydride (qPMVMMA) is prepared according to steps S11-S16. Concrete synthetic route is as follows:

[0054]

[0055] Step S11: dissolving polymethyl vinyl ether-maleic anhydride in toluene;

[0056] Step S...

Embodiment 1

[0070] Dissolve quaternized polymethylvinyl ether-maleic anhydride (qPMVMMA) in isopropanol solution, and evenly coat it on the PP substrate after completely dissolving, and dry to obtain the high-temperature-resistant lithium-ion battery separator of Example 1. Among them, the thickness of the flame retardant coating is 3 μm, and the thickness of the PP base layer is 30 μm.

Embodiment 2

[0072] Dissolve quaternized polymethylvinyl ether-maleic anhydride (qPMVMMA) in isopropanol solution, and evenly coat it on the PP substrate after completely dissolving, and dry to obtain the high-temperature-resistant lithium-ion battery separator of Example 2. Among them, the thickness of the flame retardant coating is 5 μm, and the thickness of the PP base layer is 30 μm.

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Abstract

The invention relates to a high-temperature-resistant lithium ion battery diaphragm as well as a preparation method and application thereof. The high-temperature-resistant lithium ion battery diaphragm comprises a matrix layer and a flame-retardant coating which coats the surface of the matrix layer and contains a specific polymer qPMVMMA. The qPMVMMA is polymethyl vinyl ether-maleic anhydride which is modified by quaternization. As the melting temperature of the flame-retardant coating which coats the surface of the matrix layer is higher than that of the matrix layer, when the interior of a lithium ion battery is overheated, the matrix layer is protected by the flame-retardant coating and is not easy to melt, so that thermal runaway, even combustion and explosion of the lithium ion battery caused by damage of the diaphragm are avoided, the flame-retardant property of the lithium ion battery diaphragm is greatly improved. Compared with a traditional polyolefin diaphragm, the high-temperature-resistant lithium ion battery diaphragm is higher in safety. In addition, the compatibility of the flame-retardant coating and the matrix layer is good, compared with a traditional polyolefin diaphragm coated with an inorganic material, the stability is better, the combination of the flame-retardant coating and the matrix layer is firm, and the flame-retardant coating is not prone to stripping.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-temperature-resistant lithium-ion battery separator and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are a type of batteries that use materials containing lithium elements as electrodes and rely on lithium ions to move between the positive and negative electrodes to work. Lithium-ion battery is a kind of lithium battery with many advantages such as high energy density, high power density and long cycle life, so it has received great attention in the fields of portable electronic devices, power batteries and energy storage batteries. Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolyte, separator and related packaging materials. Due to improper use, it is easy to cause thermal runaway of lithium-ion battery components, resulting in direct combustion or particip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/414H01M50/449H01M50/403H01M10/0525A62C3/16C08F8/44C08F8/24C08F216/18
CPCH01M10/0525A62C3/16C08F8/44H01M2200/00C08F8/24C08F216/18Y02E60/10
Inventor 李艳田杰杜进桥曹元成张炜鑫程时杰
Owner SHENZHEN POWER SUPPLY BUREAU
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