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Preparation method of pvdf copolymer ceramic coated diaphragm

A copolymer and ceramic coating technology, which is applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the problem of large specific surface area of ​​ceramic particles and whiskers, reducing the thermal shrinkage rate of lithium battery diaphragms, Lithium battery pole pieces are not bonded firmly and other problems, to achieve the effect of improving liquid absorption rate, increasing rate and cycle performance, and not easy to disperse and deform

Active Publication Date: 2019-09-13
JIANGSU ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application number is CN201610068433.X, a lithium ion battery ceramic diaphragm slurry, which discloses a composite coating with ceramic nanoparticles and whiskers (alumina, boehmite) as filling materials, which can effectively reduce the lithium battery The thermal shrinkage rate of the diaphragm can reach a minimum of 2.0% (MD), but the ceramic particles and whiskers have a large specific surface area, which is prone to agglomeration, and the bond with the lithium battery pole piece is not strong, and the mechanical strength of the ceramic diaphragm is low. Easy to break and puncture, causing short circuit of lithium battery

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  • Preparation method of pvdf copolymer ceramic coated diaphragm

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Embodiment 1

[0022] A preparation method for a PVDF copolymer ceramic coating diaphragm, comprising the following steps:

[0023] 1) Preparation of ceramic slurry: 170g of deionized water, 20g of Al2O3 powder, and 10g of PVAC were mixed and stirred, and ball milled in a ball mill for 1-3 hours to obtain a ceramic slurry;

[0024] 2) Preparation of PVDF copolymer glue: Stir 152g of deionized water, 19g of vinylidene fluoride-trifluoroethylene copolymer powder, and 19g of PVP evenly, and ultrasonically grind for 30-60min to obtain PVDF copolymer glue;

[0025] 3) Preparation of PVDF copolymer and ceramic mixed slurry: mix 100g of deionized water with 60g of aluminum oxide powder and stir at a speed of 1000r / min for 0.5-1.5h, then add 36g of vinylidene fluoride-three Stir the copolymer powder of vinyl fluoride for 0.5-1h at a rotational speed of 1000r / min, and finally add 4g of polyoxyethylene alkylamide for mixing and grind for 1-2h to obtain a mixed slurry of PVDF copolymer and ceramics;

...

Embodiment 2

[0029] A preparation method for a PVDF copolymer ceramic coating diaphragm, comprising the following steps:

[0030] 1) Preparation of ceramic slurry: 110g of deionized water, 70g of magnesium oxide powder, and 20g of PVA were mixed and stirred, and then ball milled in a ball mill for 1-3 hours to obtain a ceramic slurry;

[0031] 2) Preparation of PVDF copolymer glue: Stir 122.1g of deionized water, 76g of vinylidene fluoride-tetrafluoroethylene copolymer powder, and 1.9g of PVP evenly, then ultrasonically grind for 30-60min to obtain PVDF copolymer glue ;

[0032] 3) Preparation of PVDF copolymer and ceramic mixed slurry: Mix 124g of deionized water and 60g of magnesium oxide powder and stir for 0.5-1.5h at a speed of 1000r / min, then add 6g of vinylidene fluoride-tetrafluoroethylene The copolymer powder was stirred for 0.5-1h under the condition of rotating speed of 1000r / min, and finally 10g of fluoroalkyl ethoxy alcohol ether was added for mixing and then ground for 1-2h ...

Embodiment 3

[0036] A preparation method for a PVDF copolymer ceramic coating diaphragm, comprising the following steps:

[0037] 1) Preparation of ceramic slurry: Mix and stir 60g of deionized water, 120g of calcium oxide powder, and 20g of PMMA, and then ball mill in a ball mill for 1-3 hours to obtain ceramic slurry;

[0038] 2) Preparation of PVDF copolymer glue: Stir 95g of deionized water, 76g of vinylidene fluoride-hexafluoropropylene copolymer powder, and 19g of PVP evenly, and ultrasonically grind for 30-60min to obtain PVDF copolymer glue;

[0039] 3) Preparation of PVDF copolymer and ceramic mixed slurry: mix 96g of deionized water and 80g of calcium oxide powder, stir at a speed of 1000r / min for 0.5-1.5h, then add 20g of vinylidene fluoride-hexafluoropropylene The copolymer powder was stirred for 0.5-1h at a rotational speed of 1000r / min, and finally 4g of fluoroalkyl ethoxy alcohol ether was added for mixing and then ground for 1-2h to obtain a mixed slurry of PVDF copolymer a...

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Abstract

The invention provides PVDF and a preparation method of a PVDF copolymer ceramic coated diaphragm. The preparation method comprises the following steps: 1) preparing ceramic slurry; 2) preparing PVDF and PVDF copolymer glue solution; 3) preparing the PVDF and mixed slurry of the PVDF copolymer and ceramic; 4) coating. The preparation method disclosed by the invention has the beneficial effects of reducing thermal shrinkage of the diaphragm, improving cell core safety and cell thermal stability, achieving high mechanical strength, reducing PVDF crystallinity, improving imbibitions efficiency of the diaphragm, enabling the diaphragm to be not prone to deforming, guaranteeing that the cell diaphragm keeps structural stability and completeness for a long time, improving use safety of a lithium cell, enhancing adhesion between the diaphragm and pole pieces of the lithium cell, enhancing liquid absorption amount of the diaphragm of the lithium cell, improving conduction capability of lithium ions and accordingly improving multiplying power and circulation performance of the lithium ion cell.

Description

technical field [0001] The invention relates to the technical field of diaphragm production, in particular to a preparation method of a PVDF copolymer ceramic coated diaphragm. Background technique [0002] Lithium-ion batteries have become one of the important new energy sources due to their high energy density and long cycle life. However, in recent years, there have been frequent combustion or explosion accidents in electronic / power systems such as mobile phones and automobiles. Lithium-ion batteries have brought us convenience. At the same time, it is also accompanied by hidden dangers. The diaphragm is an important component of the lithium-ion battery. Severe shrinkage or melting of the diaphragm will lead to direct contact between the positive and negative electrodes of the battery, resulting in a short circuit of the battery cell. explode. Therefore, in order to meet the needs of high-power electronic equipment or power / energy storage equipment, improving the therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/40H01M50/403H01M50/409H01M50/446H01M50/449Y02E60/10
Inventor 杨浩田王晓明韦程王志彬
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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