Surface modified pmma/pvdf hybrid coated lithium battery composite diaphragm 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 effects of improving mechanical properties and adhesion, high yield, and improving specific surface energy

Active Publication Date: 2021-11-19
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 diaphragm and preparation method thereof
  • Surface modified pmma/pvdf hybrid coated lithium battery composite diaphragm and preparation method thereof
  • Surface modified pmma/pvdf hybrid coated lithium battery composite diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0031] (1) Preparation of PMMA / PVDF mixture slurry: first 1.55 parts dispersant and 0.44 parts of deionized water was added wetting agent is completely dissolved, then 4.42 parts of PVDF powder after sufficient stirring, milled IH; then 4.42 parts of PMMA powder PVDF body slurry was added lapped sufficiently stirred, and 1.5 parts of a silane coupling agent as the surface modifier, sufficiently stirred, and then triturated 0.5h, finally adding 0.88 parts of adhesive;

[0032] (2) selection of a battery separator film + 2μm 7μm polyvinyl inorganic ceramic particles coated ceramic separator, battery separator into the coating apparatus used in step (1) Preparation of PMMA / PVDF mixture slurry is coated, micro concave roll coating is applied to one side of the battery separator;

[0033] (3) After the step (2) drying the coated battery separator, winding, surface-modified PMMA / PVDF composite membrane lithium mixed-coated products.

Embodiment 2

[0035] This embodiment differs from the embodiment 1 in that Example: preparation PMMA / PVDF mixed slurry, PMMA powder is 5.30 parts, PVDF powder is 3.54 parts, 1.8 parts of a silane coupling agent.

Embodiment 3

[0037] This embodiment differs from the embodiment 1 in that Example: preparation PMMA / PVDF mixed slurry, PMMA powder is 7.07 parts, PVDF powder was 1.77 parts, 1 part of silane coupling agent.

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Abstract

The invention discloses a lithium battery composite diaphragm coated with a surface modified PMMA / PVDF mixture and a preparation method thereof; the lithium battery composite diaphragm comprises a battery diaphragm and a PMMA / PVDF mixed diaphragm coated on one side or both sides of the battery diaphragm Coating, the PMMA / PVDF hybrid coating comprises PMMA particles modified on the surface of the coupling agent and PVDF particles modified on the surface of the coupling agent. The present invention uses a coupling agent to modify the surface of PMMA and PVDF, which solves the problems of uneven mixing and easy sedimentation of PMMA and PVDF, makes the coated film surface smooth, and has a high yield rate, and effectively improves the mechanical properties and performance of the diaphragm. Adhesive, increased electrolyte absorption, improved ionic conductivity.

Description

Technical field [0001] The present invention is in the field of lithium battery separator material, particularly relates to lithium composite membrane and method for preparing surface-modified PMMA / PVDF mixture coated. Background technique [0002] As a new type of lithium secondary battery having high energy density, long cycle life, etc., expanding its scope of application, are widely used in portable electronic devices, power tools, electric vehicles and energy storage, in particular as new energy industry the rapid development of lithium batteries are increasingly used to power vehicles. However, lithium batteries are increasingly frequent occurrence of security incidents has aroused widespread concern. Wherein the membrane is an important part of the lithium battery, can effectively prevent the positive and negative contacts a short circuit, has a very important impact on the safety of lithium batteries, therefore, to enhance the safety of lithium batteries, and performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/449H01M50/443H01M50/414H01M50/489H01M50/497H01M10/052H01M50/411
CPCH01M10/052H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 陶晶王志豪杜辉王思双
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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