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Aqueous coating for separator of lithium ion battery, preparation method and application thereof

A lithium-ion battery and water-based coating technology, which is applied to secondary batteries, battery pack components, separators/films/diaphragms/spacer components, etc., to improve cycle performance and avoid separation

Active Publication Date: 2019-01-18
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 lithium-ion battery diaphragm and its preparation method in view of the above-mentioned deficiencies in the prior art, which solves the problem of PVDF and adhesive distribution in the existing water-based PVDF coating technology. Uneven, can effectively improve the cycle performance of lithium batteries

Method used

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  • Aqueous coating for separator of lithium ion battery, preparation method and application thereof
  • Aqueous coating for separator of lithium ion battery, preparation method and application thereof

Examples

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Embodiment 1

[0026] A water-based coating for lithium-ion battery separators, the raw materials of which include the following components in parts by mass: 80 parts of water-based PVDF powder SOLVAY 21216, 3 parts of polymethyl methacrylate binder, surfactant fluoroalkyl 3 parts of methoxy ether alcohol, 6 parts of dispersant carboxymethyl cellulose, 0.3 part of photosensitizer benzophenone, 0.4 part of emulsifier Tween20.

[0027] The above-mentioned lithium-ion battery diaphragm water-based coating and the preparation method of the lithium-ion battery diaphragm comprising the coating, the specific steps are as follows:

[0028] 1) According to the ratio of raw materials described in this example, add fluoroalkyl methoxy ether alcohol and carboxymethyl cellulose into deionized water, and stir rapidly for 20 minutes to obtain a mixed solution;

[0029] 2) Add benzophenone, polymethyl methacrylate adhesive, and water-based PVDF powder SOLVAY21216 to the mixed solution to form a mixed soluti...

Embodiment 2

[0033] A water-based coating for lithium-ion battery separators, the raw materials of which include the following components in parts by mass: 90 parts of water-based PVDF powder ArKema 761A, 5 parts of polyethyl methacrylate binder, surfactant fluoroalkyl 4 parts of ethoxy ether alcohol, 15 parts of dispersant hydroxypropyl methylcellulose, 0.4 part of photosensitizer diphenyl ethyl ketone, 0.3 part of emulsifier Tween80.

[0034] The above-mentioned lithium-ion battery diaphragm water-based coating and the preparation method of the lithium-ion battery diaphragm comprising the coating, the specific steps are as follows:

[0035] 1) According to the ratio of raw materials described in this example, add fluoroalkyl ethoxy ether alcohol and hydroxypropyl methylcellulose into deionized water, and stir rapidly for 25 minutes to obtain a mixed solution;

[0036] 2) Add diphenyl ethyl ketone, polyethyl methacrylate adhesive, and water-based PVDF powder ArKema 761A to the mixed solut...

Embodiment 3

[0039] A water-based coating for lithium-ion battery separators, the raw materials of which include the following components in parts by mass: 85 parts of water-based PVDF powder SOLVAY8808, 7 parts of polymethyl methacrylate binder, surfactant polyoxyethylene alkyl 6 parts of amide, 15 parts of dispersant carboxymethyl cellulose, 0.5 part of photosensitizer benzophenone, 0.3 part of emulsifier sodium polyacrylate.

[0040] The above-mentioned lithium-ion battery diaphragm water-based coating and the preparation method of the lithium-ion battery diaphragm comprising the coating, the specific steps are as follows:

[0041] 1) Add polyoxyethylene alkylamide and carboxymethyl cellulose to deionized water, and stir rapidly for 30 minutes to obtain a mixed solution;

[0042]2) Add benzophenone, polymethyl methacrylate adhesive, and water-based PVDF powder SOLVAY8808 to the mixed solution obtained in step 1) to form a mixed solution with a solid content of 10%, and stir at a speed o...

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Abstract

The invention discloses an aqueous coating for a separator of a lithium ion battery, which is characterized in that the raw material thereof comprises the following components in parts by mass: water-borne PVDF powder 80-90 parts; polymethacrylate adhesive 37 parts; surfactant 36 parts; dispersant 6-15 parts; photosensitizer 0.3-0.5 parts of emulsify; emulsifier0.2-0.4 parts; The water-borne PVDFpowder is spherical particles with a particle size of 100-150nm. A water-based PVDF powder, a photosensitizer and a polymethacrylate adhesive are mixed into a mixed emulsion uniformly existing in micelles through the actions of an emulsifier, a surfactant and a dispersant; and then coating on the surface of the separator of the lithium ion battery and irradiating with the ultraviolet light generator, so that the adhesive is compounded on the surface of the PVDF spherical particles under the action of the photosensitizer, and after drying, the coating of the adhesive and the PVDF spherical particles uniformly dispersed can be obtained, thereby effectively avoiding the problem of separating the adhesive from the PVDF particles. A membrane contain that aqueous coating of the present inventionis use for lithium batteries, and the cycle performance of the lithium batteries can be effectively improved.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a water-based coating for lithium-ion battery separators and a preparation method and application thereof. Background technique [0002] With the continuous development of electric vehicles, the performance of lithium batteries must be further improved to meet the requirements of electric vehicles. As a barrier between the positive and negative electrodes, the separator plays a vital role in the performance of lithium-ion batteries, and its performance directly affects The capacity and cycle of the battery, especially the important factors affecting the safety performance of the battery, coating the surface of the separator is an effective method to improve the safety of the separator. [0003] The water-based PVDF (polyvinylidene fluoride) coated lithium-ion battery separator is based on the traditional separator, and the surface is coated with PVDF material after...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/443H01M50/446H01M50/449
CPCH01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 唐浩林童星王红兵徐明
Owner HUIQIANG WUHAN NEW ENERGY MATERIAL TECH
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