Coating diaphragm with improved structure and preparation method thereof

A technology of structural improvement and diaphragm, applied in the direction of structural parts, electrical components, battery pack components, etc., can solve the problems of large expansion and shrinkage rate, easy bulging of batteries, battery deformation, etc., to improve liquid absorption and liquid retention, The effect of improving safety and battery energy density and prolonging service life

Pending Publication Date: 2020-06-05
武汉中兴创新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of the battery cell is getting higher and higher, and the expansion and contraction rate of the electrode during the charging

Method used

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  • Coating diaphragm with improved structure and preparation method thereof
  • Coating diaphragm with improved structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this example, the 8 μm polyethylene microporous membrane purchased from Shenzhen Zhongxing New Material Technology Co., Ltd. Direction coating into a striped coating, the specific preparation method is as follows:

[0040] (1) pulping

[0041] Add 10.0kg of polyvinylidene fluoride-hexafluoropropylene powder with an average particle size of 200nm into 85kg of acetone solution, stir and heat to 50°C, dissolve for 6 hours, then add 5kg of a 1:1 mixture of dimethyl carbonate and ethanol , stirred for 0.5h, and cooled to room temperature to obtain an acetone solution of polyvinylidene fluoride-hexafluoropropylene, that is, the gel polymer coating slurry of polyvinylidene fluoride-hexafluoropropylene in this example.

[0042] (2) coating

[0043] Coat the gel polymer coating slurry prepared above on the base film of this example, coat both sides, and dry at 50°C. The dry thickness of the coating on each side is 1.1 μm, and finally a gel polymer with a thickness of 10.2 μ...

Embodiment 2

[0045] In this example, a 12 μm ceramic diaphragm purchased from Shenzhen Zhongxing New Materials Technology Co., Ltd. was used as the base film, and polyvinylidene fluoride-hexafluoropropylene gel polymer coating slurry was used to coat the surface of the base film along the longitudinal direction Striped coating. Among them, the 12 μm ceramic separator is 8 μm polyethylene microporous membrane + 4 μm ceramic coating coated on one side. The specific preparation method of the polymer coating separator of this example is as follows:

[0046] (1) pulping

[0047] Add 10.0kg of polyvinylidene fluoride-hexafluoropropylene powder with an average particle size of 200nm into 85kg of acetone solution, stir and heat to 50°C, dissolve for 6 hours, then add 5kg of a 1:1 mixture of dimethyl carbonate and ethanol , stirred for 0.5h, and cooled to room temperature to obtain an acetone solution of polyvinylidene fluoride-hexafluoropropylene, that is, the gel polymer coating slurry of polyv...

Embodiment 3

[0051] In this example, the 8 μm polyethylene microporous membrane purchased from Shenzhen Zhongxing New Material Technology Co., Ltd. Direction coating into a striped coating, the specific preparation method is as follows:

[0052] (1) pulping

[0053] Add 15.0kg of polyvinylidene fluoride-hexafluoropropylene powder with an average particle size of 200nm into 85kg of deionized water, add a dispersant, stir for 1.5 hours, then add a wetting agent, binder and surfactant, and continue stirring for 1.5 hours , to obtain an aqueous solution of polyvinylidene fluoride-hexafluoropropylene, that is, the gel polymer coating slurry of polyvinylidene fluoride-hexafluoropropylene of this example.

[0054] (2) coating

[0055] The gel polymer coating slurry prepared above was coated on an 8 μm polyethylene-based film, coated on one side, and dried at 50 ° C. The dry thickness of the coating on each side was 1.9 μm, and finally a gel polymer film with a thickness of 9.9 μm was obtained. ...

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Abstract

The invention discloses a coating diaphragm with an improved structure and a preparation method thereof. The coating diaphragm comprises a base membrane and a polymer coating coated on at least one surface of the base membrane, and the polymer coating is formed by coating coating slurry prepared from gel polymer particles on the surface of the base membrane. The polymer coatings are distributed onthe base membrane in a line shape in the longitudinal direction, wherein the line width ranges from 0.5 micrometer to 1 m, and the line interval ranges from 0.5 micrometer to 5 m. According to the coating diaphragm disclosed by the invention, through a specially designed striped coating structure, the problems of swelling of a battery cell and deformation of a battery are solved; the safety performance of the lithium ion battery is improved; and the service life of the battery is prolonged. The coating diaphragm disclosed by the invention can be used for manufacturing conventional square andcylindrical batteries and can also be folded to form other strip-shaped and polygonal special-shaped batteries by adjusting the line width and interval of the polymer coatings. The manufacturing direction of the battery cell is expanded, so that the safety of the battery is further improved, and the energy density of the battery is further increased. The cycle life of the battery is prolonged.

Description

technical field [0001] The application relates to the field of battery separators, in particular to a structurally improved coated separator and a preparation method thereof. Background technique [0002] As the energy density of lithium-ion power batteries continues to increase, safety issues have become the primary issue that needs to be addressed in battery design. Especially when the energy density of a single battery reaches 300Wh / kg, traditional polyolefin separators and ceramic separators are difficult to meet the requirements of battery applications. Due to its contribution to the structural design of the battery cell, the polymer-coated separator greatly improves the safety performance of the battery and prolongs the battery life, making it the first choice for power battery applications. [0003] At present, there are three types of power battery cells: square, soft pack and cylindrical. Among them, square batteries using winding technology are more widely used by...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 张辉姚坤陈巧刘琳米策
Owner 武汉中兴创新材料技术有限公司
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