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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AI-Extracted 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 im...

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%.

Application Domain

Li-accumulatorsCell component details

Technology Topic

Electrical batteryAdhesive +6

Image

Examples

Experimental program(5)
Comparison scheme(1)
Effect test(1)

Example Embodiment

[0037] Example 1

[0038] S1: 83 parts of ceramic powder were dissolved in 93 denominates, stirred well, and 0.1245 parts of CMC, 0.1245 parts were added thereto, and the first mixture was obtained after stirring.

[0039] S2: After the first mixing is added to the sand mill, 0.54 parts of CMC is mixed again, and the second mix is added, and the sand mill is 1200l / h, the sand mill is 750 rpm, the sand mill is oxidized. Zirconium beads, its filler is 60% of the sand mill, and the zirconia bead size is 0.6-0.8 mm.

[0040] S3: 0.0295 parts of polyacrylate adhesive, 0.57 parts of wetting agent is mixed, and stirred even after 0.57 parts of wetting agent is mixed.

[0041] S4: Filter filtration of the third mixture, magnetic separation, to obtain a ceramic slurry.

[0042] S5: The ceramic slurry is uniformly coated on one side surface having a thickness of 12 μm and a porosity of 39%, and the coating thickness is 3 μm, dried in an oven at 60 ° C to obtain ceramic coating. The film is covered.

Example Embodiment

[0043] Example 2

[0044] S1: 83 parts of ceramic powder were dissolved in 93 part of deionized water, stirred well, and 0.1245 parts of thickener, 0.1245 parts of dispersant were added, and the first mixture was obtained.

[0045] S2: After the first mixing is added to the sand mill, 0.54 parts of CMC is mixed again, and the second mix is added, and the sand mill is 1200l / h, the sand mill is 750 rpm, the sand mill is oxidized. Zirconium beads, its filler is 60% of the sand mill, and the zirconia bead size is 0.6-0.8 mm.

[0046] S3: 0.0376 parts of polyacrylate adhesive, 0.57 parts of wetting agent is mixed, and stirred even after 0.57 parts of wetting agent, resulting in a third mixture;

[0047] S4: Filter filtration of the third mixture, magnetic separation, to obtain a ceramic slurry.

[0048] S5: The ceramic slurry is uniformly coated on one side surface having a thickness of 12 μm and a porosity of 39%, and the coating thickness is 3 μm, dried in an oven at 60 ° C to obtain ceramic coating. The film is covered.

Example Embodiment

[0049] Example 3

[0050] S1: 83 parts of ceramic powder were dissolved in 93 denominates, stirred well, and 0.1245 parts of CMC, 0.1245 parts were added thereto, and the first mixture was obtained after stirring.

[0051] S2: After the first mixing is added to the sand mill, 0.54 parts of CMC is mixed again, and the second mix is added, and the sand mill is 1200l / h, the sand mill is 750 rpm, the sand mill is oxidized. Zirconium beads, its filler is 60% of the sand mill, and the zirconia bead size is 0.6-0.8 mm.

[0052] S3: 0.054 parts of polyacrylate adhesive, 0.57 parts of wetting agent is mixed, and stirred even after 0.57 parts of wetting agent is mixed.

[0053] S4: Filter filtration of the third mixture, magnetic separation, to obtain a ceramic slurry.

[0054] S5: The ceramic slurry is uniformly coated on one side surface having a thickness of 12 μm and a porosity of 39%, and the coating thickness is 3 μm, dried in an oven at 60 ° C to obtain ceramic coating. The film is covered.

PUM

Property	Measurement	Unit
Size	0.6 ~ 0.8	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

moderate viscosity
Good wettability

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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