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Alkali-resistant coating slurry, crucible with alkali-resistant coating and preparation method

A technology of alkali resistance and coating slurry, which is applied in crucible furnace, lighting and heating equipment, electrode manufacturing, etc. It can solve the problems that the material is easy to react with the crucible, the positive electrode material is easy to stick to the wall, and the service life is short, so as to achieve improvement Wall sticking phenomenon, performance without side effects, and the effect of improving the service life

Pending Publication Date: 2021-12-31
BEIJING HINA BATTERY TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an alkali-resistant coating slurry, a crucible with an alkali-resistant coating and a preparation method, so as to solve the problem of the short service life of the crucible used in sintering positive electrode materials in the prior art and the easy staining of positive electrode materials after sintering. wall and the material is easy to react with the crucible

Method used

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  • Alkali-resistant coating slurry, crucible with alkali-resistant coating and preparation method
  • Alkali-resistant coating slurry, crucible with alkali-resistant coating and preparation method
  • Alkali-resistant coating slurry, crucible with alkali-resistant coating and preparation method

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preparation example Construction

[0036] The present invention also provides a method for preparing a crucible with an alkali-resistant coating, comprising the following steps:

[0037] filling the crucible base with the slurry, standing for 1-2 minutes, pouring out the slurry in the crucible base, standing for 12-48 hours, drying and sintering to obtain a crucible with an alkali-resistant coating.

[0038] In the present invention, the slurry is the above-mentioned alkali-resistant coating slurry.

[0039] In the present invention, the crucible base is preferably a mullite crucible, a corundum mullite crucible or a cordierite mullite crucible, more preferably a mullite crucible.

[0040] In the present invention, the standing time after pouring out the slurry in the crucible base is preferably 12-48 hours, more preferably 26-42 hours, and more preferably 36 hours.

[0041] In the present invention, the drying temperature is preferably 25-80°C, more preferably 28-60°C, more preferably 35°C; the drying time is...

Embodiment 1

[0047] This embodiment provides a crucible with an alkali-resistant coating, and the preparation method comprises the following steps:

[0048] (1) Add 21g aluminum phosphate (particle size is 8 μm), 0.2g sodium polyacrylate, 0.24g sodium carboxymethyl cellulose to 200g deionized water, after fully stirring and mixing, a slurry with good fluidity is obtained;

[0049](2) Clean up the mullite crucible matrix with a hairbrush, then fill the mullite crucible matrix with the slurry in step (1), let it stand for 1min, pour out the slurry in the mullite crucible matrix, and let it stand Set aside for 28 hours, dry at 32°C for 36 hours, and then sinter at 1080°C for 36 hours to obtain a crucible with an alkali-resistant coating with a thickness of 0.2 mm.

Embodiment 2

[0051] This embodiment provides a crucible with an alkali-resistant coating, and the preparation method comprises the following steps:

[0052] (1) Add 150g of calcium phosphate (particle size is 15 μm), 1.6g of ammonium polyacrylate, and 2g of carboxymethyl cellulose into 2000g of deionized water, and after fully stirring and mixing, a slurry with good fluidity is obtained;

[0053] (2) Clean the corundum mullite crucible matrix with a brush, then fill the corundum mullite crucible matrix with the slurry in step (1), let it stand for 1min, and pour out the slurry in the corundum mullite crucible matrix The material was left to stand for 30 hours, dried at 35°C for 24 hours, and then sintered at 1300°C for 20 hours to obtain a crucible with an alkali-resistant coating with a thickness of 0.3 mm.

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Abstract

The invention belongs to the technical field of crucible coatings, and discloses alkali-resistant coating slurry, a crucible with an alkali-resistant coating and a preparation method. The slurry is composed of phosphate, a dispersing agent, a binder and water according to the mass ratio of (20-150): (0.1-1.4): (0.1-1.4): 1000, the slurry is prepared on the inner wall of a crucible base body through a slip casting process, the crucible with the coating is formed and can be used for high-temperature sintering of a sodium (lithium) ion battery precursor and a sodium (lithium) ion battery positive electrode material, the coating can promote crystallization reaction of the sodium (lithium) ion battery positive electrode material and the precursor, the corrosion to the crucible is reduced in the process of promoting high-temperature diffusion, the service life of the crucible is prolonged, the coating has no side effect on the performance of the electrode material, and the wall sticking phenomenon of the material can be improved.

Description

technical field [0001] The invention relates to the technical field of crucible coating, in particular to an alkali-resistant coating slurry, a crucible with an alkali-resistant coating and a preparation method. Background technique [0002] In recent years, lithium-ion batteries have gradually replaced nickel-hydrogen batteries and lead-acid batteries, occupying a large market in the field of new energy batteries. However, in the preparation process of lithium-ion battery materials, the life of the crucible used for the sintering of lithium-ion battery cathode material precursors and lithium-ion battery cathode materials is generally short, and the carbonic acid in the precursors of sodium-ion batteries and sodium-ion battery cathode materials The alkalinity of sodium is stronger than that of lithium carbonate, and its corrosion effect on the crucible is more obvious. Therefore, the consumables required for the preparation of lithium (sodium) ion battery materials have a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87F27B14/10H01M4/04H01M4/139H01M10/052H01M10/054H01M10/058
CPCC04B41/87C04B41/5048C04B41/009F27B14/10H01M4/0471H01M4/139H01M10/052H01M10/054H01M10/058H01M2004/028C04B35/185C04B35/10C04B35/195C04B41/4539C04B41/0072Y02E60/10Y02P70/50
Inventor 程斯琪王伟刚周文泽王建鑫陈森戚兴国唐堃
Owner BEIJING HINA BATTERY TECH CO LTD
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