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Surface-modified PMMA/PVDF hybrid-coated lithium battery composite diagram and preparation method thereof

A technology of surface modification and composite diaphragm, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problem of uneven mixing of PMMA and PVDF, poor consistency of PMMA electrolyte infiltration, insufficient PVDF adhesion, etc. problems, to achieve the effect of solving uneven mixing, high yield and improving mechanical properties

Active Publication Date: 2019-07-23
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a lithium battery composite diaphragm and a preparation method thereof with a surface-modified PMMA / PVDF hybrid coating, which can effectively solve the problem of insufficient PVDF bonding performance and the influence of crystallinity on ion conductivity and PMMA electrolysis. It can also solve the problems of uneven mixing and easy sedimentation of PMMA and PVDF

Method used

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  • Surface-modified PMMA/PVDF hybrid-coated lithium battery composite diagram and preparation method thereof
  • Surface-modified PMMA/PVDF hybrid-coated lithium battery composite diagram and preparation method thereof
  • Surface-modified PMMA/PVDF hybrid-coated lithium battery composite diagram and preparation method thereof

Examples

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Embodiment 1

[0031] (1) Prepare PMMA / PVDF mixed slurry: first add 1.55 parts of dispersant and 0.44 parts of wetting agent into deionized water to completely dissolve, then add 4.42 parts of PVDF powder and stir thoroughly, grind for 1 hour; then add 4.42 parts of PMMA powder Add the body to the ground PVDF slurry and stir well, and add 1.5 parts of silane coupling agent as a surface modifier, stir well, grind for 0.5 hours, and finally add 0.88 parts of adhesive;

[0032] (2) The battery separator is made of 7 μm polyethylene-based film + 2 μm inorganic ceramic particle coating ceramic separator, and the battery separator is sent to the coating device, and the PMMA / PVDF mixed slurry prepared in step (1) is used for coating. Coating on one side of the battery separator by gravure roller coating;

[0033] (3) drying and winding the battery separator coated in step (2) to obtain a finished lithium battery composite separator coated with surface-modified PMMA / PVDF.

Embodiment 2

[0035] The difference between this example and Example 1 is that when preparing the PMMA / PVDF mixed slurry, the PMMA powder is 5.30 parts, the PVDF powder is 3.54 parts, and the silane coupling agent is 1.8 parts.

Embodiment 3

[0037] The difference between this example and Example 1 is that when preparing the PMMA / PVDF mixed slurry, the PMMA powder is 7.07 parts, the PVDF powder is 1.77 parts, and the silane coupling agent is 1 part.

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Abstract

The invention discloses a surface-modified PMMA / PVDF hybrid-coated lithium battery composite diagram and a preparation method thereof. The lithium battery composite diagram comprises a battery diagramand a PMMA / PVDF hybrid coating layer, wherein the PMMA / PVDF hybrid coating layer is coated on a single side or dual sides of the battery diagram and comprises a coupling agent surface-modified PMMA particles and coupling agent surface-modified PVDF particles. Surfaces of PMMA and PVDF are modified by a coupling agent, the problems that the PMMA and the PVDF are not uniform to mix and are easy tosettle down are solved, so that the coating film surface is smooth, and high yield is achieved; and moreover, the mechanical property and the adhesiveness of the diagram are effectively improved, theelectrolyte absorption is improved, and the ion conductivity is improved.

Description

technical field [0001] The invention belongs to the field of lithium battery separator materials, in particular to a lithium battery composite separator coated with surface-modified PMMA / PVDF and a preparation method thereof. Background technique [0002] As a new type of secondary battery, lithium battery has the advantages of high energy density and long cycle life. Its application range continues to expand and is widely used in portable electronic devices, electric tools, energy storage and power vehicles. With the rapid development, lithium batteries are more and more used in power vehicles. However, frequent lithium battery safety accidents have aroused widespread concern. Among them, the separator, as an important part of the lithium battery, can effectively prevent the short circuit between the positive and negative electrodes, which has a very important impact on the safety of the lithium battery. Therefore, the performance improvement and safety requirements of the...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/411
CPCH01M10/052H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 陶晶王志豪杜辉王思双
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD