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Preparation method of water-based ceramic slurry for coating and battery diaphragm

A ceramic slurry, water-based technology, applied in the direction of non-aqueous electrolyte batteries, lithium batteries, battery pack parts, etc., to achieve the effect of preventing more fractures, convenient adjustment, and moderate viscosity

Active Publication Date: 2022-02-18
HEFEI XINGYUAN NEW ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current ceramic-coated separator can improve the physical properties of the separator, such as heat resistance and air permeability, but with the continuous improvement of the performance requirements of the lithium-ion battery for the separator, the existing technology and related preparation methods need to be further improved

Method used

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  • Preparation method of water-based ceramic slurry for coating and battery diaphragm
  • Preparation method of water-based ceramic slurry for coating and battery diaphragm
  • Preparation method of water-based ceramic slurry for coating and battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] S1: Dissolve 83 parts of ceramic powder in 93 parts of deionized water, stir evenly, add 0.1245 parts of CMC and 0.1245 parts of dispersant to it in turn, and stir evenly to obtain the first mixture;

[0039] S2: After adding the first mixed material into the sand mill for sand grinding, add 0.54 parts of CMC again and stir evenly to obtain the second mixed material; the sand mill flow rate is 1200L / h, the sand mill speed is 750rpm, and the sand mill medium is oxidized Zirconia beads, the filling amount is 60% of the sanding chamber, and the size of the zirconia beads is 0.6-0.8mm.

[0040] S3: Add 0.0295 parts of polyacrylate adhesive and 0.57 parts of wetting agent to the second mixture in turn, and stir evenly to obtain a third mixture;

[0041] S4: performing foreign matter filtration and magnetic separation on the third mixed material to obtain ceramic slurry.

[0042] S5: The ceramic slurry is uniformly coated on one side surface of a PE microporous diaphragm wit...

Embodiment 2

[0044] S1: Dissolve 83 parts of ceramic powder in 93 parts of deionized water, stir evenly, add 0.1245 parts of thickener and 0.1245 parts of dispersant to it in turn, and stir evenly to obtain the first mixture;

[0045] S2: After adding the first mixed material into the sand mill for sand grinding, add 0.54 parts of CMC again and stir evenly to obtain the second mixed material; the sand mill flow rate is 1200L / h, the sand mill speed is 750rpm, and the sand mill medium is oxidized Zirconia beads, the filling amount is 60% of the sanding chamber, and the size of the zirconia beads is 0.6-0.8mm.

[0046] S3: Add 0.0376 parts of polyacrylate adhesive and 0.57 parts of wetting agent to the second mixture in turn, and stir evenly to obtain a third mixture;

[0047] S4: performing foreign matter filtration and magnetic separation on the third mixed material to obtain ceramic slurry.

[0048] S5: The ceramic slurry is uniformly coated on one side surface of a PE microporous diaphragm...

Embodiment 3

[0050] S1: Dissolve 83 parts of ceramic powder in 93 parts of deionized water, stir evenly, add 0.1245 parts of CMC and 0.1245 parts of dispersant to it in turn, and stir evenly to obtain the first mixture;

[0051] S2: After adding the first mixed material into the sand mill for sand grinding, add 0.54 parts of CMC again and stir evenly to obtain the second mixed material; the sand mill flow rate is 1200L / h, the sand mill speed is 750rpm, and the sand mill medium is oxidized Zirconia beads, the filling amount is 60% of the sanding chamber, and the size of the zirconia beads is 0.6-0.8mm.

[0052] S3: Add 0.054 parts of polyacrylate adhesive and 0.57 parts of wetting agent to the second mixture in turn, and stir evenly to obtain a third mixture;

[0053] S4: performing foreign matter filtration and magnetic separation on the third mixed material to obtain ceramic slurry.

[0054] S5: The ceramic slurry is uniformly coated on one side surface of a PE microporous diaphragm with...

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Abstract

The invention discloses a preparation method of water-based ceramic slurry for coating, which comprises the steps of dissolving ceramic powder in water, uniformly stirring, sequentially adding a thickening agent and a dispersing agent, and uniformly stirring to obtain a first mixture; adding the first mixture into a sand mill for sanding, then adding the thickening agent again, and uniformly stirring to obtain a second mixture; sequentially adding an adhesive and a wetting agent into the second mixture, and uniformly stirring to obtain a third mixture; and performing foreign matter filtration and magnetic separation on the third mixture to obtain the ceramic slurry. In the slurry preparation process, the ceramic slurry with better heat resistance is obtained by adjusting the adding sequence of the thickening agent and the proportion of the adhesive. The invention also discloses a battery diaphragm. The battery diaphragm can reach different ventilation increments of 10-80sel / 100ml, and meanwhile, the thermal shrinkage rate of the diaphragm is ensured to be less than 3%.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm preparation, in particular to a preparation method for coating with water-based ceramic slurry and a battery diaphragm. Background technique [0002] In recent years, with the vigorous development of the global new energy industry, lithium-ion batteries have been widely used in power batteries, mobile device power supplies, energy storage and other fields due to their high energy density, high output voltage, and long service life. With the large-scale use of lithium-ion batteries, their safety requirements are also increasing. As the main material of the battery, the main function of the separator in the lithium-ion battery is to isolate the positive and negative electrodes to prevent the battery from self-discharging and short-circuiting of the two poles. The advantage of using ceramic coating on the surface of the separator is more obvious. Improving the thermal stability of ...

Claims

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Application Information

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IPC IPC(8): C04B26/06H01M10/052H01M50/403H01M50/417H01M50/434H01M50/451
CPCC04B26/06H01M50/434H01M50/417H01M50/451H01M50/403H01M10/052C04B18/023C04B24/281C04B24/383C04B24/42C04B24/26C04B22/06Y02E60/10
Inventor 胡明明林敬王郗宋召飞王飞
Owner HEFEI XINGYUAN NEW ENERGY MATERIAL CO LTD
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