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Preparation method of high-permeability vinylidene fluoride polymer mixed coating diaphragm

A vinylidene fluoride, the technology of vinylidene fluoride is applied to the high-permeability vinylidene fluoride polymer mixed-coated separator, the preparation of the high-permeability vinylidene fluoride polymer mixed-coated separator, and the field of lithium batteries, which can solve the problem of unfavorable lithium The lithium ion conduction and cycle performance of the battery, the effect is not significant, and the powder is easy to fall off.

Active Publication Date: 2019-12-31
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 of high-permeability vinylidene fluoride polymer mixed coating diaphragm
  • Preparation method of high-permeability vinylidene fluoride polymer mixed coating diaphragm
  • Preparation method of high-permeability vinylidene fluoride polymer mixed coating diaphragm

Examples

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Embodiment 1

[0066] (1) Mix 7 parts of PVDF with 100 parts of DMAC, stir and dissolve at 50°C and 1500rpm for 3h, then add 20 parts of alumina, mix and stir for 1h, finally add 10 parts of polyglycerol, stir at 500rpm for 0.5h to obtain a mixed slurry ;

[0067] (2) Coat the mixed slurry on both sides of a 7 μm polyethylene-based film, and then pass through a pore-forming pool containing 0.3% polyoxyethylene alkylamine and 5% DMAC. The temperature of the pore-forming pool is 50°C, and the pore-forming time is 10s. ; Then enter the extraction tank with a temperature of 50°C and a pH of 8, and the extraction time is 30s;

[0068] (3) After pore-making and extraction, the separators were dried in three-section ovens at temperatures of 45, 55, and 50°C in sequence, and rolled to obtain mixed-coated separators with a single-side coating thickness of 3 μm.

[0069] The SEM topography of the final mixed-coated separator surface is as follows figure 1 shown.

[0070] Depend on figure 1 It can be...

Embodiment 2

[0072] (1) Mix 7 parts of PVDF with 100 parts of NMP, stir and dissolve at 50°C and 1500rpm for 3h, then add 20 parts of alumina, mix and stir for 1.5h, finally add 15 parts of polyglycerol, stir at 500rpm for 0.5h to obtain a mixed slurry material;

[0073] (2) Coat the mixed slurry on both sides of a 7 μm polyethylene-based film, and then pass through a pore-forming pool containing 0.3% polyoxyethylene alkylamine and 5% NMP. The temperature of the pore-forming pool is 50°C, and the pore-forming time is 15s ; Then enter the extraction tank with a temperature of 50°C and a pH of 8, and the extraction time is 1 min;

[0074] (3) After pore-making and extraction, the separators were dried in three-section ovens at temperatures of 45, 55, and 50°C in sequence, and rolled to obtain mixed-coated separators with a single-side coating thickness of 3 μm.

Embodiment 3

[0076] (1) Mix 9 parts of PVDF with 100 parts of DMAC, stir and dissolve at 40°C and 1500rpm for 4h, then add 25 parts of alumina, mix and stir for 2h, finally add 10 parts of polyglycerol, stir at 500rpm for 0.5h to obtain a mixed slurry ;

[0077] (2) Coat the mixed slurry on both sides of a 7 μm polyethylene-based film, and then pass through a pore-forming pool containing 0.3% polyoxyethylene alkylamine and 5% DMAC. The temperature of the pore-forming pool is 50°C, and the pore-forming time is 20s. ; Then enter the extraction tank with a temperature of 50°C and a pH of 8, and the extraction time is 1 min;

[0078] 3. After pore-making and extraction, the diaphragm is sequentially dried in three-section ovens with temperatures of 45, 55, and 50°C, and rolled to obtain a mixed-coated diaphragm with a single-sided coating thickness of 3 μm.

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Abstract

The invention relates to a preparation method of a high-permeability vinylidene fluoride polymer mixed coating diaphragm, the high-permeability vinylidene fluoride polymer mixed coating diaphragm prepared by the method and a lithium battery comprising the high-permeability vinylidene fluoride polymer mixed coating diaphragm. According to the method, the vinylidene fluoride polymer mixed coating diaphragm is formed by one-time coating, the process is simple, and the prepared mixed coating diaphragm has higher porosity and pore-making uniformity, increases the liquid storage capacity of the electrolyte and improves the cycle performance of the lithium battery.

Description

technical field [0001] The invention belongs to the field of diaphragm technology, and relates to a preparation method for preparing a highly air-permeable vinylidene fluoride polymer mixed-coated diaphragm. Lithium battery with fluoroethylene polymer mixed-coated diaphragm. 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. The conventional lithium-ion battery separators currently on the market form coating films by coating inorganic ceramics on polyolefin separators to improve the high temperature resistance and wettability of polyolefin separators. [0003] Although the ceramic coated separator has good high temperature resistance, the bonding force between the ceramic coating and the pole piece is weak, and it is easy to cause the separator and the pole piece to separate during the lithium battery cycle, resulting in a seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 周素霞王晓明杨浩田黄云王婷
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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