Preparation method of high-compactness small-diameter spherical tricobalt tetraoxide

A technology of tricobalt tetroxide and small particle size, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems that the sphericity and compactness cannot meet the battery capacity, the precipitation treatment of unfavorable metal ions, the high content of Co in the mother liquor and the tail liquor, and reduce heavy metals. The effect of high content, product tap density and uniform mixing

Active Publication Date: 2019-06-28
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the sphericity and compactness of the currently produced hydroxyl route of cobalt tetroxide cannot meet the development requirements of battery capacity, and the complexing agent used to prepare cobalt oxyhydroxide at this stage is EDTA, which has strong complexing ability and is easy to complex. Various metal ions in the combined water cause the high content of Co in the mother liquor and tail liquid during the production process, and the presence of EDTA in the wastewater is not conducive to the precipitation treatment of other metal ions, which easily makes the heavy metal content in the wastewater exceed the standard, and increases the quality of the wastewater. Difficulty of handling

Method used

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  • Preparation method of high-compactness small-diameter spherical tricobalt tetraoxide
  • Preparation method of high-compactness small-diameter spherical tricobalt tetraoxide
  • Preparation method of high-compactness small-diameter spherical tricobalt tetraoxide

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Experimental program
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Effect test

Embodiment 1

[0025] Provide cobalt sulfate solution from the extraction process, generally choose to use cobalt-containing complexes to produce 1.6mol / L cobalt sulfate solution through wet treatment;

[0026] Alkali preparation: Weigh 3 kg of sodium hydroxide crystals, add deionized water to dissolve, and finally set the volume to 10L. In order to prepare enough lye, the above steps can be repeated;

[0027] Ammonia water configuration: Measure 1.6L of 25%-27% ammonia water, add water to dilute, and finally set the volume to 10L. In order to prepare enough ammonia water, the above steps can be repeated;

[0028] Add 10L of hot pure water to the reaction kettle, adjust the pH to 12 by adding the lye configured above, and then pass in compressed air with an air flow rate of 25L / h, and pump the cobalt sulfate solution, lye solution and ammonia solution configured above at the same time , wherein the flow rate of cobalt liquid is 20mL / min, the flow rate of ammonia water is 2ml / min, and the sti...

Embodiment 2

[0033] Provide cobalt sulfate solution from the extraction process, generally choose to use cobalt-containing complexes to produce 1.6mol / L cobalt sulfate solution through wet treatment;

[0034] Alkali preparation: Weigh 3 kg of sodium hydroxide crystals, add deionized water to dissolve, and finally set the volume to 10L. In order to prepare enough lye, the above steps can be repeated;

[0035] Ammonia water configuration: Measure 1.6L of 25%-27% ammonia water, add water to dilute, and finally set the volume to 10L. In order to prepare enough ammonia water, the above steps can be repeated;

[0036] Add 2L of hot pure water into the reaction kettle, adjust the pH to 12 by adding the lye configured above, and then pass in compressed air with an air flow rate of 25L / h, and pump the cobalt sulfate solution, lye solution and ammonia solution in the above steps at the same time, Among them, the cobalt liquid flow rate is 16mL / min, the ammonia water flow rate is 1.5ml / min, and the s...

Embodiment 3

[0041] Provide cobalt sulfate solution from the extraction process, generally choose to use cobalt-containing complexes to produce 1.6mol / L cobalt sulfate solution through wet treatment;

[0042] Alkali preparation: Weigh 3 kg of sodium hydroxide crystals, add deionized water to dissolve, and finally set the volume to 10L. In order to prepare enough lye, the above steps can be repeated;

[0043] Ammonia water configuration: Measure 1.6L of 25%-27% ammonia water, add water to dilute, and finally set the volume to 10L. In order to prepare enough ammonia water, the above steps can be repeated;

[0044] Add 10L of hot pure water into the reaction kettle, adjust the pH to 12 by adding the lye configured above, and then pass in compressed air with an air flow rate of 25L / h, and pump the cobalt sulfate solution, lye solution and ammonia solution in the above steps at the same time, Among them, the flow rate of cobalt liquid is 16mL / min, the flow rate of ammonia water is 1.5ml / min, an...

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Abstract

The invention belongs to the technical field of preparation of a battery positive electrode material precursor, and particularly relates to a preparation method of tricobalt tetraoxide. The preparation method of the high-compactness small-diameter spherical tricobalt tetroxide is characterized in that ammonium hydroxide is taken as a complexing agent to be separately prepared and pumped, the ratioof cobalt to ammonia which are pumped into a reaction kettle is precisely controlled, cobalt oxyhydroxide biased toward a granular crystal is obtained through the oxidative precipitation of a cobalt-ammonia complex, the appropriate cobalt-ammonia ratio controls the granular and platelike crystallization trend to obtain an appropriate primary granular crystal, and the appropriate growth speed is controlled to obtain the compact spherical cobalt oxyhydroxide. The small-diameter tricobalt tetraoxide prepared through the method has a good sphericity degree, uniform particle size, good compactness, low Co content in tail liquid, low temperature during synthesis and stable and controllable process.

Description

technical field [0001] The invention belongs to the technical field of preparation of battery cathode material precursors, and in particular relates to a preparation method of tricobalt tetroxide. Background technique [0002] The upgrading of products in the 3C field and the rapid development of various high-end smart devices have brought stable growth demand for lithium cobalt oxide batteries. 3C lithium batteries are gradually developing in the direction of high voltage and high compaction, and the use of high-density particles for mixing can further increase the energy density of the prepared battery. Many cathode material manufacturers have proposed the demand for high-density small-particle cobalt tetroxide. Compared with cobalt tetroxide prepared by other routes such as cobalt carbonate, the small particle size cobalt tetroxide produced by the hydroxyl route has the advantages of large particle tap density and uniform particle size. [0003] However, the sphericity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 夏勇田礼平刘人生张荣洲秦才胜
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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