Preparation method for filamentous vinylidene fluoride polymer composite coated diaphragm

A vinylidene fluoride and polymer technology, which is used in the field of preparation of filamentous vinylidene fluoride polymer composite coated separators, lithium batteries, and filamentous vinylidene fluoride polymer composite coated separators, can solve the problem of easy powder removal and separators. Problems such as plugging pores, permeability, unfavorable lithium ion conduction and cycle performance of lithium batteries

Active Publication Date: 2019-12-20
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based vinylidene fluoride polymer coating improves the adhesion between the coating film and the electrode to a certain extent, but the effect is not significant and it is easy to lose powder. The adhesion between the oil-based vinylidene fluoride polymer coating and the electrode is relatively poor Good, but it is easy to cause the diaphragm to be blocked or the air permeability to decrease, which is not conducive to the lithium ion conduction and cycle performance of the lithium battery

Method used

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  • Preparation method for filamentous vinylidene fluoride polymer composite coated diaphragm
  • Preparation method for filamentous vinylidene fluoride polymer composite coated diaphragm
  • Preparation method for filamentous vinylidene fluoride polymer composite coated diaphragm

Examples

Experimental program
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Effect test

preparation example 1

[0077] Preparation Example 1: Preparation of ceramic diaphragm:

[0078] 1. Mix 15 parts of styrene butadiene rubber with 50% solid content and 37 parts of DI water, stir at 25°C and 500rpm for 20 minutes; add 80 parts of alumina and 100 parts of thickener (5% CMC premixed aqueous solution), 25°C Stir at 1500 rpm for 1.5 hours to obtain a ceramic slurry with a solid content of about 40%.

[0079] 2. Coat the ceramic slurry on one side of the 9μm polyethylene base film at a coating speed of 50m / min. After drying, a ceramic diaphragm is obtained. The thickness of the ceramic layer is about 3μm.

Embodiment 1

[0081] 1. Mix 8 parts of PVDF, 5 parts of aramid and 100 parts of DMAC uniformly, stir to dissolve, then add 15 parts of polyglycerol, mix and stir evenly to obtain PVDF slurry.

[0082] 2. Coat the PVDF slurry on the ceramic layer of the ceramic coating film obtained in Preparation Example 1 and the other side of the base film, and then pass through a pore-forming cell containing 0.1% polyoxyethylene alkylamine and 5% MMAC, and the temperature of the pore-forming cell 50℃, the pore-making time is 10s; then it enters into the extraction cell with a temperature of 50℃ and pH=8, and the extraction time is 1min.

[0083] 3. After the pore-forming extraction, the diaphragm is sequentially dried in a three-section oven at a temperature of 45, 60, and 50 ℃, and then wound to obtain a filamentary PVDF composite diaphragm.

[0084] The SEM topography of the final composite diaphragm surface is as follows figure 1 Shown.

[0085] by figure 1 It can be seen that PVDF forms a filiform network co...

Embodiment 2

[0087] 1. Mix 8 parts of PVDF, 5 parts of PAI and 100 parts of NMP uniformly, stir to dissolve, and then add 15 parts of polyglycerol, mix and stir uniformly to obtain PVDF slurry.

[0088] 2. Coat the PVDF slurry on the ceramic layer of the ceramic coating film obtained in Preparation Example 1 and the base film on the other side, and then pass through a pore-forming cell containing 0.1% polyoxyethylene alkylamine and 5% NMP. 50°C, the pore-making time is 15s; then it enters the extraction cell with a temperature of 50°C and pH=8, and the extraction time is 2min.

[0089] 3. The coating film after pore making and extraction is sequentially dried in a three-section oven at a temperature of 45, 60, and 50 ℃, and then rolled to obtain a filamentary PVDF composite membrane.

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Abstract

The invention relates to a preparation method for a filamentous vinylidene fluoride polymer composite coated diaphragm, a filamentous vinylidene fluoride polymer composite coated diaphragm prepared bythe method and a lithium battery comprising the filamentous vinylidene fluoride polymer composite coated diaphragm. The prepared filamentous vinylidene fluoride polymer composite diaphragm is uniformin vinylidene fluoride polymer coating, large in porosity and good in air permeability, the air permeability of a coated film cannot be increased, the binding power between the diaphragm and a pole piece is improved, the electrolyte storage capacity is improved, and the cycle performance of a lithium battery is improved.

Description

Technical field [0001] The invention belongs to the technical field of diaphragms, and relates to a preparation method of a filamentary vinylidene fluoride polymer composite coating membrane. The filamentary vinylidene fluoride polymer composite coating membrane prepared by the method and comprising the filamentary vinylidene fluoride Lithium battery with polymer composite coating separator. Background technique [0002] With the demand for high energy density of ternary and lithium iron phosphate batteries, the performance requirements of separators for lithium batteries are increasing day by day. Conventional lithium-ion battery separators currently on the market form a coating film by coating inorganic ceramics on polyolefin separators to improve the high temperature resistance and wetting properties of the polyolefin separators. [0003] Although the ceramic coating diaphragm has good high temperature resistance, the adhesion between the ceramic coating and the pole piece is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/411H01M50/461H01M50/449Y02E60/10
Inventor 黄云王晓明刘勇标周素霞王婷
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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