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Preparation method of metal coated cobaltosic oxide

A technology of tricobalt tetroxide and cobalt hydroxide, which is applied in the field of lithium-ion batteries, can solve the problems of easy hydrolysis, low production efficiency, uneven cobalt precipitation, etc., and achieve the effect of inhibiting growth and increasing the number of crystal nuclei

Pending Publication Date: 2019-07-30
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is used to prepare lithium doped with high-valence and large atomic weight elements niobium, tungsten, and tantalum cobaltate, there is a problem that niobium, tungsten, and tantalum chlorides are easily hydrolyzed as wet dopants, resulting in the formation of niobium, tungsten, and tantalum elements. Inhomogeneous precipitation with lithium and cobalt
In addition, the cobalt compound is very easy to oxidize, and the oxidized cobalt compound will hinder the rapid growth of the synthetic product. Therefore, this method also has the problem of low production efficiency.

Method used

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  • Preparation method of metal coated cobaltosic oxide
  • Preparation method of metal coated cobaltosic oxide
  • Preparation method of metal coated cobaltosic oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0057] The configured A solution is 10m 3 The cobalt concentration is 20g / L cobalt nitrate solution; the prepared B solution is 10m 3 Cobalt nitrate solution with a cobalt concentration of 160g / L; the prepared C solution is a mixed solution of sodium hydroxide solution and ammonia solution. Among them, the concentration of sodium hydroxide solution is 200g / L, the concentration of ammonia solution is 180g / L, 10ml of hydrazine hydrate solution with a mass concentration of 80% is added to every liter of ammonia solution, and the volume of ammonia solution and sodium hydroxide solution in C solution The ratio is 0.05; the configured solution D is 500L aluminum nitrate solution with an aluminum concentration of 9.86g / L.

[0058] Synthesis reaction: At the beginning of the synthesis reaction, add solution A to solution B at a flow rate of 250L / h...

Embodiment 2

[0066] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0067] The configured A solution is 10m 3 The cobalt concentration is 30g / L cobalt sulfate solution, and the prepared B solution is 10m 3 The cobalt sulfate solution that cobalt concentration is 150g / L. The prepared C solution is a mixed solution of sodium hydroxide solution and ammonia solution, wherein the concentration of sodium hydroxide solution is 250g / L, the concentration of ammonia solution is 180g / L, and 15ml of hydration solution with a mass concentration of 80% is added to each liter of ammonia solution. Hydrazine solution, and the volume ratio of ammonia solution to sodium hydroxide solution in solution C is 0.08; solution D is 500L aluminum sulfate solution with an aluminum concentration of 14.79g / L.

[0068] Synthesis reaction: At the beginning of the synthesis reaction, add solution A to solution B at a flow rate of 250L / h, ...

Embodiment 3

[0076] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0077] The configured A solution is 10m 3 The cobalt concentration is 40g / L cobalt chloride solution; the prepared B solution is 10m 3 A cobalt chloride solution with a cobalt concentration of 140g / L; the prepared solution C is a mixed solution of sodium hydroxide solution and ammonia solution. Among them, the concentration of sodium hydroxide solution is 300g / L, the concentration of ammonia solution is 180g / L, 20ml of hydrazine hydrate solution with a mass concentration of 80% is added to every liter of ammonia solution, and the volume of ammonia solution and sodium hydroxide solution in C solution The ratio is 0.1; the configured D solution is 500L aluminum trichloride solution with an aluminum concentration of 119.73g / L.

[0078] Synthesis reaction: At the beginning of the synthesis reaction, add solution A to solution B at a flow rate ...

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Abstract

The invention discloses a preparation method of metal coated cobaltosic oxide. The method provided by the invention comprises the steps of: increasing the concentration gradient of a cobalt solution added into a reaction kettle along with the extension of synthesis time, and simultaneously adjusting the solid-to-liquid ratio of slurry in the reaction kettle to synthesize dense cobalt hydroxide with the laser granularity D50 of 17-19 [mu]m by employing a wet method; and after the synthesis is finished, adding a metal solution and a precipitator solution into the reaction kettle in parallel flowto perform metal coating, and after the coating is finished, performing washing, drying and calcining for a synthesized product to obtain a metal-doped cobaltosic oxide product. The cobaltosic oxideproduct prepared by the method is uniform in doped element distribution and spherical or sphere-like in appearance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a coated metal tricobalt tetroxide used for preparing high-voltage lithium cobaltate. Background technique [0002] Lithium-ion batteries made of lithium cobalt oxide 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 trioxide 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, small particle size aluminum-dope...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 陈晓闯赵宗明刘世红吴来红
Owner JINCHUAN GROUP LIMITED
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