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Preparation method of cobaltosic oxide

A technology of tricobalt tetroxide and cobalt hydroxide, which is applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of cumbersome process, inability to prepare cobalt hydroxide, and unfavorable industrial production, so as to increase the number of crystal nuclei and promote the gradual and rapid growth of crystal nuclei The effect of growing and reducing the number of crystal nuclei

Active Publication Date: 2019-07-12
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent requires multiple cycles of crystallization in the cobalt carbonate synthesis stage, the process is cumbersome, and it is not conducive to industrial production
Chinese invention patent CN201210401514.9 discloses "a method and device for preparing spherical cobalt tetroxide with large particle size". Predetermined production particle size, then the suspension in the discharge port is passed back into the reaction device to continue the reaction until the particle size of cobalt tetroxide at the discharge port of the reaction device is not less than the predetermined production particle size, the suspension is passed into the Spherical cobalt trioxide is obtained by filtering in a filter press. This method cannot control the steady growth of cobalt hydroxide during the production process, and cannot prepare crystallized and dense cobalt hydroxide.

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  • Preparation method of cobaltosic oxide
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  • Preparation method of cobaltosic oxide

Examples

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Embodiment 1

[0051] A preparation method of large-size cobalt tetroxide, specifically comprising the following steps:

[0052] Step (a), dosing:

[0053] Configured A solution: 10m 3 The cobalt concentration is 20g / L cobalt nitrate solution;

[0054] Prepared B solution: 15m 3 Cobalt concentration is the cobalt nitrate solution of 160g / L;

[0055] Prepared solution C: Take ammonia water with a concentration of 180g / L, add 5ml of hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution, and then mix it with a sodium hydroxide solution with a concentration of 200g / L at a volume ratio of 0.1:1 income.

[0056] Step (b), synthesis reaction:

[0057] At the beginning of the synthesis reaction, add solution B to solution A at a flow rate of 300 L / h. At the same time, solution A and B are mixed with solution C at a flow rate of 500 L / h. Cobalt hydroxide synthesis is carried out under the agitation intensity of the reactor. When the volume of the slurry in th...

Embodiment 2

[0065] A preparation method of large-size cobalt tetroxide, specifically comprising the following steps:

[0066] Step (a), dosing:

[0067] Configured A solution: 10m 3 The cobalt concentration is 30g / L cobalt sulfate solution;

[0068] Prepared B solution: 15m 3 Cobalt concentration is the cobalt sulfate solution of 150g / L;

[0069] Preparation of solution C: Take ammonia water with a concentration of 180g / L, add 15ml of hydrazine hydrate solution with a mass concentration of 80% per liter of ammonia solution, and then mix it with a sodium hydroxide solution with a concentration of 250g / L at a volume ratio of 0.15:1. .

[0070] Step (b), synthesis reaction:

[0071] At the beginning of the synthesis reaction, the B solution was added to the A solution at a flow rate of 300L / h. At the same time, the A and B solutions were mixed and fed into the reactor with the C solution at a flow rate of 500L / h. The cobalt hydroxide is synthesized under the agitation of the reactor. W...

Embodiment 3

[0079] A preparation method of large-size cobalt tetroxide, specifically comprising the following steps:

[0080] Step (a), dosing:

[0081] Configured A solution: 10m 3 Cobalt concentration is 40g / L cobalt chloride solution;

[0082] Prepared B solution: 15m 3 Cobalt concentration is the cobalt chloride solution of 140g / L;

[0083] Preparation of solution C: Take ammonia water with a concentration of 180g / L, add 20ml of hydrazine hydrate solution with a mass concentration of 80% to each liter of ammonia solution, and then mix it with a sodium hydroxide solution with a concentration of 300g / L at a volume ratio of 0.2:1 .

[0084] Step (b), synthesis reaction:

[0085] At the beginning of the synthesis reaction, the B solution was added to the A solution at a flow rate of 300L / h. At the same time, the A and B solutions were mixed and fed into the reactor with the C solution at a flow rate of 500L / h. The cobalt hydroxide is synthesized under the agitation of the reactor. W...

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Abstract

The invention discloses a preparation method of cobaltosic oxide. The method comprises the following steps: with the extension of the synthesis time, concentration gradient of a cobalt solution addedinto a reaction vessel increases or decreases, and solid-liquid ratio of slurry in the reaction vessel is adjusted, and dense cobalt hydroxide is synthesized by a wet method; after the synthesis, thesynthesis product is washed, dried and calcined to obtain a cobaltosic oxide product. By the process, spherical or spheroidal large-grained cobaltosic oxide product with laser particle size D10 being12-15 microns, D50 being 17-19 microns, D90 being 22-25 microns, tap density being greater than or equal to 2.4 g / cm<3> and specific surface area being 1.0-3.0 m<2> / g or spherical or spheroidal small-grained cobaltosic oxide product with laser particle size D10 being 1-3 microns, D50 being 3-5 microns, D90 being 7-10 microns, tap density being greater than or equal to 2.5 g / cm<3> and specific surface area being 1.0-3.0 m<2> / g can be prepared.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing cobalt trioxide with large particle size for preparing high-voltage lithium cobaltate. Background technique [0002] Lithium-ion batteries prepared with lithium cobaltate as the positive electrode material have the characteristics of light weight, large capacity, high specific energy, high working voltage, stable discharge, suitable for high-current discharge, good cycle performance, and long life. They are mainly used in 3C digital fields . [0003] Lithium cobalt oxide is developing in the direction of high voltage, high compaction, and high cycle performance, and the requirements for the raw material cobalt tetroxide are getting higher and higher. Co 3 o 4 It is a functional material with special structure and properties, Co 3 o 4 The market is already facing the status quo of gradual shrinkage, and the large-grained Co 3 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/32C01P2004/51C01P2004/61C01P2006/11C01P2006/12
Inventor 陈晓闯吴来红刘世红吴芳
Owner JINCHUAN GROUP LIMITED
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