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A lithium battery diaphragm containing composite coating and preparation method thereof

A composite coating and separator technology, applied in circuits, electrical components, battery pack components, etc., can solve the problems of poor wettability of the separator, reduced ionic conductivity, and influence on the use of lithium batteries, and achieves improved wettability and circulation. The effect of increased performance and extended service life

Active Publication Date: 2020-04-24
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Considering the safety performance of lithium batteries, a single-coated separator can no longer meet the needs of the battery. The current lithium battery separator has poor wettability, which can easily lead to a decrease in ion conductivity, heat generation during use, and a decrease in stability, all of which affect lithium batteries. The use of batteries; therefore, a lithium battery separator with excellent performance is required

Method used

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  • A lithium battery diaphragm containing composite coating and preparation method thereof
  • A lithium battery diaphragm containing composite coating and preparation method thereof

Examples

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preparation example Construction

[0023] A preparation method of a lithium battery separator containing a composite coating, comprising the following steps:

[0024] The inorganic reagent, the organic solvent and the co-solvent are first stirred and mixed according to the weight ratio of 4-6:8-10:1-3 to obtain a dispersed slurry;

[0025] The heat-resistant agent and the first organic solvent are mixed according to the weight ratio of 2-3:9-10 for the second stirring to obtain a heat-insulated homogenate;

[0026] performing the third stirring and mixing of the adhesive and the heat-insulation homogenate to obtain the heat-insulation slurry;

[0027] After the fourth stirring and mixing of the dispersion slurry and the heat insulation slurry, coating on the base film, extracting in the extractant and drying; obtaining the bottom membrane;

[0028] The fifth stirring and mixing of the PVDF powder and the second organic solvent according to the ratio of parts by weight of 1-6:45-58, to obtain a PVDF solution; ...

Embodiment 1

[0047] This embodiment provides a preparation method of a lithium battery separator containing a composite coating, the preparation method comprising the following preparation steps:

[0048] Preparation of coating bottom slurry and bottom diaphragm:

[0049] 1.1 Mix alumina powder, isopropanol and CaCl 2After mixing according to the weight ratio of 4:8:1, stir and mix evenly, the stirring speed is 2000rpm, and the stirring time is 100min to obtain a dispersed slurry;

[0050] 1.2 Mix phthaloylphenylene m-phenylenediamine as a heat resistant agent with organic solvent dimethylacetamide in a weight ratio of 2:9, and stir and mix evenly. The stirring speed is 1000rpm, and the stirring time is 60min to obtain Insulated homogenate;

[0051] 1.3 Mix 2% adhesive PVP with heat-insulation homogenate, and stir to mix evenly. The stirring time is 30 minutes to obtain heat-insulation slurry;

[0052] 1.4 Stir and mix the dispersion slurry and heat insulation slurry for 50 minutes, the...

Embodiment 2

[0062] This embodiment provides a preparation method of a lithium battery separator containing a composite coating, the preparation method comprising the following preparation steps:

[0063] Preparation of coating bottom slurry and bottom diaphragm:

[0064] 1.1 After mixing the mixed powder of alumina powder and magnesium hydroxide powder as an inorganic reagent, dipropylene glycol and LiCl according to the weight ratio of 6:10:3, stir and mix evenly, the stirring speed is 3000rpm, and the stirring time is 200min. dispersion slurry;

[0065] 1.2 Mix the mixture of isophthaloylphenylene m-phenylenediamine and terephthalamide p-phenylenediamide as a heat-resistant agent with the organic solvent dimethylacetamide in a weight ratio of 3:10, and stir and mix. Evenly, the stirring speed is 1500rpm, and the stirring time is 90min to obtain a heat-insulated homogenate;

[0066] 1.3 Mix the mixture of 9% PVP and PTFE as an adhesive with the heat-insulating homogenate, and stir and ...

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Abstract

The invention provides a lithium battery diaphragm containing a composite coating and a preparation method thereof, belonging to the technical field of new energy and materials. The preparation method of the lithium battery diaphragm containing the composite coating provided by the present invention adopts the method of preparing a heat-resistant material into a homogeneous slurry and coating it on the base film, and then coating the PVDF outer coating on the heat-resistant material to obtain; by coating Heat-resistant materials increase the heat resistance of the lithium battery diaphragm, enhance the heat resistance and stability of the battery diaphragm; at the same time, the wettability of the battery diaphragm is improved; the cycle performance of the battery is increased, and the service life of the battery is extended.

Description

technical field [0001] The invention relates to the technical field of new energy and materials, in particular to a lithium battery diaphragm containing a composite coating and a preparation method thereof. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowing electrolyte ions to pass through. The separator material is non-conductive, and its physical and chemical properties have a great influence on the perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/446H01M50/449H01M50/489
CPCH01M50/446H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 徐锋袁海朝王晓静苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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