A kind of preparation method of tricobalt tetroxide with small particle size

A technology of tricobalt tetroxide and small particle size, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve problems such as difficult realization and complicated process, and achieve the effects of saving production cost, increasing direct yield, and improving washing performance.

Active Publication Date: 2020-07-03
南通金通储能动力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method for preparing small-sized cobalt tetroxide is cumbersome and difficult to realize

Method used

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  • A kind of preparation method of tricobalt tetroxide with small particle size
  • A kind of preparation method of tricobalt tetroxide with small particle size
  • A kind of preparation method of tricobalt tetroxide with small particle size

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a. Dosing: prepare a cobalt chloride solution with a cobalt concentration of 1mol / L, i.e. solution A; configure a mixed solution of sodium hydroxide and ammonia, i.e. solution B, wherein the concentration of sodium hydroxide solution is 2mol / L, and the concentration of ammonia solution 5mol / L, and the volume ratio of ammonia solution to sodium hydroxide solution in the mixed solution is 0.05; prepare a hydrogen peroxide solution with a concentration of 5mol / L, namely C solution.

[0028] B, synthesis reaction: before the synthesis reaction, add the cobalt hydroxide flash drying dust collecting material of 30% cobalt mass in A solution in reaction kettle, then simultaneously add A solution, B solution, C solution in the reaction kettle simultaneously, in The synthesis reaction was carried out under strong stirring. During the reaction, the flow rate of solution A was controlled to be 300L / h, the flow rate of solution C was 0.1 times the flow rate of solution A, the reacti...

Embodiment 2

[0036] a. Dosing: prepare a cobalt sulfate solution with a cobalt concentration of 1.5mol / L, i.e. solution A; prepare a mixed solution of sodium hydroxide and ammonia, i.e. solution B, wherein the concentration of sodium hydroxide solution is 4mol / L, and the concentration of ammonia solution is 8mol / L, and the volume ratio of ammonia solution to sodium hydroxide solution in the mixed solution is 0.08; prepare a hydrogen peroxide solution with a concentration of 8mol / L, namely C solution.

[0037] B, synthesis reaction: before the synthesis reaction, add the cobalt hydroxide flash drying dust collecting material of 30% cobalt mass in A solution in reaction kettle, then simultaneously add A solution, B solution, C solution in the reaction kettle simultaneously, in The synthesis reaction was carried out under strong stirring. During the reaction, the flow rate of solution A was controlled to be 300L / h, the flow rate of solution C was 0.15 times the flow rate of solution A, the rea...

Embodiment 3

[0045] a, dosing: preparation of cobalt nitrate solution with a cobalt concentration of 2mol / L, i.e. solution A; configuration of a mixed solution of sodium hydroxide and ammonia, i.e. solution B, wherein the concentration of sodium hydroxide solution is 6mol / L, and the concentration of ammonia solution is 10mol / L, and the volume ratio of ammonia solution to sodium hydroxide solution in the mixed solution is 0.1; prepare a hydrogen peroxide solution with a concentration of 10mol / L, namely C solution.

[0046] B, synthesis reaction: before the synthesis reaction, add the cobalt hydroxide flash drying dust collecting material of 30% cobalt mass in A solution in reaction kettle, then simultaneously add A solution, B solution, C solution in the reaction kettle simultaneously, in The synthesis reaction was carried out under strong stirring. During the reaction, the flow rate of solution A was controlled to be 300L / h, the flow rate of solution C was 0.2 times the flow rate of solutio...

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Abstract

The present invention discloses a method for small particle size tricobalt tetraoxide, the method adopts a certain concentration of cobalt solution as a cobalt source, sodium hydroxide solution as a precipitant, ammonia solution as a complexing agent and a hydrogen peroxide solution as an oxidant agent. Before starting synthesis, adding certain amount of cobalt hydroxide flash-dried dust to the reaction kettle, and then carrying out a synthesis reaction in the reaction kettle; during process of the synthesis reaction, preventing growth of the synthetic by the cobalt hydroxide flash-dried dust,thereby controlling particle size of products; after completion of the synthesis reaction, adding a certain amount of conductive carbon black to the reaction kettle, and ageing for a period of time,filtering , washing, and drying the material to obtain a small particle size tricobalt tetraoxide precursor product, and then calcining the tricobalt tetraoxide precursor product to obtain a small particle size tricobalt tetraoxide product. The method can easily prepare a spherical or near-spheroidal tricobalt tetraoxide product having a laser particle size of 3 to 5 mu m, a tap density of more than 2.0 g / cm<3> and a specific surface area of 1.0 to 3.0 m<2> / g.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium-ion batteries, and in particular relates to a preparation method of tricobalt tetroxide with small particle size. 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 . 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, and the small granularity Co 3 o 4 The market ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/32C01P2004/61C01P2006/11C01P2006/12
Inventor 陈晓闯刘世红吴来红何艳
Owner 南通金通储能动力新材料有限公司
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