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A high-voltage lithium-ion battery composite diaphragm ceramic coating and the composite diaphragm composed of the same and its preparation method and application

A technology for lithium-ion batteries and composite diaphragms, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of inability to meet the needs of high-voltage lithium-ion batteries, poor interface stability of ceramic composite diaphragm coatings, and high-voltage stability To improve interface stability, improve cycle performance and safety performance, and reduce side reactions

Active Publication Date: 2018-02-27
中科深蓝汇泽新能源(青岛)有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional ceramic coating binders, such as polyvinylidene fluoride (PVDF) or polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) have poor high-voltage stability, and the prepared ceramic composite diaphragm coating has poor interface stability and Coulomb The efficiency is too low to meet the needs of high-voltage lithium-ion batteries

Method used

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  • A high-voltage lithium-ion battery composite diaphragm ceramic coating and the composite diaphragm composed of the same and its preparation method and application

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Comparison scheme
Effect test

Embodiment 1

[0022] First, mix the silica ceramic powder with a diameter of 0.5 microns, nitrogen nitrogen dimethylacetamide solvent, and polystyrene carbonate binder in a ratio of 1 gram: 10 grams: 1 gram to obtain a coating slurry material; then, the obtained slurry is coated on both sides of the polypropylene single-layer diaphragm by roller coating, and after heating and drying, a ceramic composite diaphragm with a coating thickness of 10 microns is obtained; finally, the high-voltage lithium ion Test the cycle performance of the separator in the battery;

Embodiment 2

[0024] First, mix the aluminum oxide ceramic powder with a diameter of 0.5 microns, nitrogen methyl pyrrolidone solvent, and polybutylene succinate binder according to the ratio of 1 gram: 10 grams: 1 gram to obtain a coating slurry ; Then, the obtained slurry is coated on both sides of the polypropylene single-layer diaphragm by dip coating, and after heating and drying, a ceramic composite diaphragm with a coating thickness of 15 microns is obtained; finally, in the high-voltage lithium-ion battery Test the cycle performance of the diaphragm;

Embodiment 3

[0026] First, mix titanium dioxide ceramic powder with a diameter of 0.2 microns, nitrogen-nitrogen-dimethylformamide solvent, and polyethylene carbonate binder in a ratio of 1 gram: 10 grams: 1 gram to obtain a coating slurry Then, the obtained slurry is coated on one side of the polypropylene single-layer diaphragm by spraying, and after heating and drying, a ceramic composite diaphragm with a coating thickness of 5 microns is obtained; finally, in the high-voltage lithium-ion battery Test the cycle performance of the diaphragm;

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Abstract

The invention relates to a ceramic coating, in particular to a high-voltage resistant lithium-ion battery composite diaphragm ceramic coating and the composite diaphragm formed therefrom, as well as its preparation method and application. The ceramic coating is composed of a new type of high voltage resistant binder and inorganic ceramic powder. The new type of high voltage resistant binder includes polypropylene carbonate, polyethylene carbonate, polybutylene succinate, polyepoxycyclohexane At least one of alkane carbonate and polystyrene carbonate. The inorganic ceramic powder is uniformly mixed with an organic solvent and a new high-pressure resistant binder to obtain a coating slurry; the obtained slurry is coated on a supporting substrate to obtain a composite diaphragm with a specific coating thickness. The composite diaphragm can be used in all high-voltage lithium-ion batteries whose upper limit cut-off voltage is 4.4-5.2V. The composite diaphragm ceramic coating can improve the interface stability of the composite diaphragm, reduce side reactions, and increase Coulombic efficiency, thereby significantly improving the cycle performance and safety performance of the high-voltage lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a high-voltage-resistant lithium-ion battery composite diaphragm ceramic coating, a composite diaphragm composed of the same, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries have been widely used in small electronic digital products and other fields because of their advantages such as high energy density, long life, wide operating temperature window, high safety, environmental friendliness, and no memory effect. However, with the development of large-scale energy storage base stations, electric vehicles and other fields, higher requirements have been placed on the energy density and power density of lithium-ion batteries, and the problem of insufficient battery life of current lithium-ion batteries has become increasingly prominent. Therefore, improving the energy density and power density of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/434H01M50/446H01M50/489
CPCH01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 崔光磊许高洁丁国梁张建军赵江辉
Owner 中科深蓝汇泽新能源(青岛)有限责任公司
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