A kind of hot water resistant coating for lithium battery diaphragm and its preparation method and application

A lithium battery separator, heat-resistant water-resistant technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc. The effect of high temperature resistance and battery cycle performance, high uniformity, comprehensive electrochemical performance and high temperature resistance performance

Active Publication Date: 2021-10-01
HUIQIANG WUHAN NEW ENERGY MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a water-based coating for heat-resistant lithium-ion battery diaphragm and its preparation method in view of the deficiencies in the above-mentioned prior art, which solves the problem of uneven distribution of PVDF and high-temperature-resistant adhesives, The electrochemical comprehensive performance and high temperature resistance performance of the coating have been well improved

Method used

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  • A kind of hot water resistant coating for lithium battery diaphragm and its preparation method and application
  • A kind of hot water resistant coating for lithium battery diaphragm and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method of preparing a separator with hot water separator and a lithium battery comprising coating the aqueous coating of the heat-lithium, the following steps:

[0026] (1) The aqueous emulsion of polyvinylidene fluoride and an aqueous RC-10246 YH-1066 polyimide in effective mass of solids ratio of 80: 3 were mixed and stirred at the first rotation speed 1200rpm 30min, mixed, after 3500rpm speed stirring 1h, and finally stirring 1100rpm 20min, to obtain a homogeneous composite aqueous dispersion coating slurry;

[0027] (2) Method of the complex aqueous knife coating slurry onto the surface of a polypropylene separator, formed 0.6um thick lithium ion battery separator by hot water resistance after coating the surface of a polypropylene separator 70 ℃ dried 18s while obtaining lithium battery separator comprises hot water resistance of the coating.

[0028] Depend on figure 1 Understood, the present invention is a lithium battery separator obtained with a high degree of co...

Embodiment 2

[0030] A method of preparing a separator with hot water separator and a lithium battery comprising coating the aqueous coating of the heat-lithium, the following steps:

[0031] (1) The aqueous emulsion of polyvinylidene fluoride and an aqueous polytetrafluoroethylene RC-10280 D1610F in effective mass of solids ratio of 85: 4 mixture, stirred at the first rotation speed 1100rpm 40min, mixed well, then at 3800rpm speed stirred for 2h, and finally stirring 1000rpm 30min, to obtain a homogeneous composite aqueous dispersion coating slurry;

[0032] (2) Method of coating the aqueous coating composite slurry was applied to a polyethylene separator surface to form 1um thick lithium ion battery separator in polyethylene separator surface was dried at 60 deg.] C hot water with a coating 30s, while to give lithium battery separator comprises hot water resistance of the coating.

Embodiment 3

[0034] A method of preparing a separator with hot water separator and a lithium battery comprising coating the aqueous coating of the heat-lithium, the following steps:

[0035] (1) The aqueous emulsion of polyvinylidene fluoride and an aqueous XPH-838 PIW-1066 polyimide in effective mass of solids ratio of 86: 7 after mixing, was first stirred for 45 min at a rotation speed 1300rpm, mixing uniformly, after 3600rpm speed stirring 1.5h, and finally stirring 1200rpm 25min, to obtain a homogeneous composite aqueous dispersion coating slurry;

[0036] (2) the method of the composite roll coating aqueous coating slurry was applied to the surface of a polypropylene separator, and dried at 65 deg.] C 25s formed 1.5um thick lithium ion battery separator in the hot water resistance coating the surface of a polypropylene separator, while lithium battery separator comprises hot water to obtain a coating.

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Abstract

The invention discloses a hot water-resistant coating for a lithium battery diaphragm, which is a composite coating comprising water-based PVDF spherical particles and a water-based high-temperature-resistant polymer; the mass ratio of the water-based PVDF spherical particles to the water-based high-temperature-resistant polymer 80-90:3-7, the particle diameter of the water-based PVDF spherical particles is 100-300nm. The present invention enables the water-based high-temperature-resistant polymer to enter the micelles of the PVDF emulsion through the regulation and optimization of low-speed, high-speed, and low-speed three rotation speeds to obtain a uniform PVDF / high-temperature-resistant polymer composite slurry; the high-temperature-resistant polymer in the composite slurry The polymer is attached to the surface of each PVDF particle, so the problem of uneven distribution of PVDF and high-temperature-resistant adhesive is solved; the hot water-resistant coating formed on the polyolefin separator substrate with this slurry has extremely high uniformity Therefore, the electrochemical comprehensive performance and high temperature resistance performance of the hot water resistant coating have been well improved, which can effectively improve the high temperature resistance and battery cycle performance of the lithium battery separator.

Description

Technical field [0001] The present invention is in the field of new energy materials, particularly, to a lithium battery separator coating and hot water preparation, application. Background technique [0002] With the development of electric vehicles, the lithium battery must be further improved performance to meet the requirements of an electric vehicle, as a barrier between the positive and negative electrode separator play a crucial role in the performance of a lithium ion battery, which directly affect the performance and the cycling of the battery capacity, in particular the important factors affecting the safety of the battery performance, coating is an effective method to improve the safety of the separator surface of the separator. Publication of Patent Application No. CN201210000157.5 of a membrane that is coated by a ceramic material coated on the base film layer and the composition of the surface layer on the outer surface of the polymeric adhesive of the ceramic layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/449H01M50/417H01M50/411H01M50/423H01M50/426H01M50/443
CPCH01M50/40H01M50/403H01M50/409Y02E60/10
Inventor 唐浩林童星王红兵徐明
Owner HUIQIANG WUHAN NEW ENERGY MATERIAL TECH
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