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Preparation method of cobaltosic oxide particles and calcining equipment

A technology of cobalt tetroxide particles and cobalt tetroxide, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of cobalt carbonate sticking, affecting the fluidity of materials, large agglomerates, etc., to avoid sticking and agglomeration, and improve quality.

Active Publication Date: 2021-08-10
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing cobalt tetroxide by calcining cobalt carbonate particles, severe adhesion of cobalt carbonate will occur during high-temperature calcination, resulting in larger agglomerates
At the same time, the cohesive and agglomerated cobalt carbonate will affect the fluidity of the material, resulting in uneven heating of the particles in the material layer, and the problems of over-burning of some particles and large differences in particle morphology.
The above problems will affect the mixing uniformity and reaction stability in the subsequent preparation of lithium-ion battery cathode materials.

Method used

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  • Preparation method of cobaltosic oxide particles and calcining equipment
  • Preparation method of cobaltosic oxide particles and calcining equipment
  • Preparation method of cobaltosic oxide particles and calcining equipment

Examples

Experimental program
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Effect test

preparation example Construction

[0039] The preparation method of the tricobalt tetroxide particles is not limited to steps S1 to S3 shown in the figure, and can be appropriately changed. For example, before step S1, if the cobalt carbonate particles are prepared by a wet method, the dehydration process or moisture control process of the cobalt carbonate particles may be required, and the sieving treatment in steps S1 and S3 can be performed multiple times. The dehydration process or moisture control process before step S1 and the sieving before calcination of step S1 can effectively separate the cohesive and agglomerated cobalt carbonate, and avoid the problem of uneven heating of the inner and outer particles of the cobalt carbonate massive agglomerate. The dehydration process or moisture control process before step S1 preferably controls the moisture content of cobalt carbonate to ≤4%. The sieved cobalt carbonate particles are more likely to roll with the calcination equipment in the calcination equipment,...

Embodiment 1

[0066] The particle size D50 of the cobalt carbonate particles used is 4.2 μm, the aluminum doping amount is 0.38%, the water content is 2%, the mesh size is 325, the rotary kiln speed is 1.0r / min, and the cobalt carbonate particle feed rate is 250kg / h.

[0067] In step S2, in the low-temperature calcination process S21, the temperature is 200°C, and the residence time is 30min. At the end of the low-temperature calcination process S21, the conversion rate of cobalt carbonate is 19%, and the cobalt content is 50%; The residence time is 30min.

[0068] The particle size D50 of the cobalt tetroxide product obtained after sieving and mixing is 3.8 μm, the peak width of the particle size distribution is 0.66, and the specific surface area is 3.2m 2 / g.

[0069] Figure 4 Be according to the scanning electron micrograph (3000 times) of the product obtained in specific example 1 of the present invention. Figure 4 It can be seen in the figure that the obtained cobalt tetraoxide p...

Embodiment 2

[0071] The particle size D50 of the cobalt carbonate particles used is 4.7 μm, the aluminum doping amount is 0.65%, the moisture content is 4%, the mesh number of the cobalt carbonate particles is 200, the mesh number of the tricobalt tetroxide particles is 325, the rotary kiln speed is 1.5r / min, and the cobalt carbonate particles enter Material speed 300kg / h.

[0072] In step S2, in the low-temperature calcination process S21, the temperature is 350°C, and the residence time is 20min. At the end of the low-temperature calcination process S21, the conversion rate of cobalt carbonate is 26%, and the cobalt content is 52%; The residence time is 20min.

[0073] The particle size D50 of the cobalt tetroxide product obtained after mixing is 4.0 μm, the peak width of the particle size distribution is 0.68, and the specific surface area is 3.5m 2 / g.

[0074] Figure 5 It is a scanning electron micrograph (3000 times) of the product obtained in specific example 2 according to the ...

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Abstract

The invention discloses a preparation method of cobaltosic oxide particles, the preparation method comprises calcination treatment of calcining cobaltosic oxide particles to obtain cobaltosic oxide, and the calcination treatment comprises a low-temperature calcination process of heating the cobaltosic oxide particles to a first temperature to calcine the particles; a cooling crystallization promoting process, wherein the particles subjected to the low-temperature calcination process are kept at a second temperature lower than the first temperature for a preset time; and a high-temperature calcination process, wherein the particles subjected to the cooling crystallization promotion process are continuously calcined at a temperature higher than the first temperature. The invention further discloses calcining equipment. According to the preparation method of the cobaltosic oxide particles and the calcining equipment, the cooling crystallization promoting procedure is set before the high-temperature calcining procedure in the process of calcining the cobaltosic oxide particles, the surfaces of the cobaltosic oxide particles are promoted to be basically converted into cobaltosic oxide crystals, and therefore adhesion and agglomeration of the particles in the calcining process are avoided, and the quality of the obtained cobaltosic oxide particles is improved.

Description

technical field [0001] The invention relates to the field of new energy, and more specifically, to a method for preparing cobalt trioxide particles used as lithium-ion battery materials. The invention also relates to related calcination equipment. Background technique [0002] With the upgrading of electronic products, especially mobile phones, the requirements for lithium-ion battery life and size continue to increase, and there is an urgent need to further increase the volumetric energy density of batteries. Manufacturers of cathode materials for lithium-ion batteries often mix large and small particles to increase the compaction density of the cathode, thereby increasing the energy density of lithium-ion batteries. Cobalt tetroxide is an important precursor for the preparation of lithium cobalt oxide, a cathode material for high-voltage lithium batteries, and its various indicators affect the performance of lithium cobalt oxide cathode materials and downstream lithium-io...

Claims

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Application Information

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IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/61C01P2006/12C01P2004/03Y02E60/10
Inventor 徐伟夏勇田礼平刘人生童秋桃熊铜兴李艳黄凯祝婷
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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