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Method for preparing large-granularity cobaltosic oxide

A technology of tricobalt tetroxide and large particle size, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve problems such as unfavorable industrial production, cumbersome process, etc., and achieve the effects of improving washing performance, improving direct yield and saving production costs.

Active Publication Date: 2018-12-07
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

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 tetroxide is obtained by filtering in a filter press. The precipitating agent used in this patent is hydroxide, which is different from the patent of this application, and the suspension needs to be repeatedly re-introduced into the reaction device to continue the reaction. The process is cumbersome

Method used

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  • Method for preparing large-granularity cobaltosic oxide
  • Method for preparing large-granularity cobaltosic oxide
  • Method for preparing large-granularity cobaltosic oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0040] The configured A solution is 1mol / L cobalt chloride solution, the prepared B solution is 2mol / L sodium hydroxide solution, the configured C solution is 5mol / L ammonia solution, and the concentration of 5ml is added in every liter of ammonia solution. 80% hydrazine hydrate solution.

[0041] Prepare seed crystals. Before the start of the synthesis reaction, add 100kg of cobalt hydroxide flash-dried dust collector and 10L of hydrazine hydrate into the reaction kettle, stir for 2 hours at a stirring intensity of 200 rpm, and start the synthesis reaction.

[0042] synthesis reaction. At the beginning of the synthesis reaction, A solution, B solution, and C solution were added into the reaction kettle in parallel, and the synthesis reaction was carried out under strong stirring. During the reaction, the flow rate of A solution was strict...

Embodiment 2

[0050] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0051] The configured A solution is 1.5mol / L cobalt sulfate solution, the prepared B solution is 4mol / L sodium hydroxide solution, the configured C solution is 8mol / L ammonia solution, and the concentration of 12ml is added in every liter of ammonia solution. 80% hydrazine hydrate solution.

[0052] Prepare seed crystals. Before the start of the synthesis reaction, add 150kg of cobalt hydroxide flash-dried dust collector and 15L of hydrazine hydrate into the reaction kettle, stir for 3 hours at a stirring intensity of 180 rpm, and start the synthesis reaction.

[0053] synthesis reaction. At the beginning of the synthesis reaction, A solution, B solution, and C solution were added into the reaction kettle in parallel, and the synthesis reaction was carried out under strong stirring. During the reaction, the flow rate of A solution was stri...

Embodiment 3

[0061] The production steps are the same as above, and will not be repeated here. The specific parameters in each step are as follows:

[0062] The configured A solution is a 2mol / L cobalt nitrate solution, the prepared B solution is a 6mol / L sodium hydroxide solution, and the configured C solution is a 10mol / L ammonia solution, and the concentration of 80 ml is added to each liter of ammonia solution. % hydrazine hydrate solution.

[0063] Prepare seed crystals. Before the start of the synthesis reaction, add 200kg of cobalt hydroxide flash-dried dust collector and 20L of hydrazine hydrate into the reactor, stir for 4 hours at a stirring intensity of 150 rpm, and start the synthesis reaction.

[0064] synthesis reaction. At the beginning of the synthesis reaction, A solution, B solution, and C solution were added into the reaction kettle in parallel, and the synthesis reaction was carried out under strong stirring. During the reaction, the flow rate of A solution was stric...

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Abstract

The invention belongs to the field of anode materials of lithium ion batteries, and provides a method for preparing large-granularity cobaltosic oxide. The method adopts a cobalt solution with certainconcentration as a cobalt source, a sodium hydroxide solution as a precipitator, an ammonia solution as a complexing agent and a hydrazine hydrate solution as a reducing agent, and comprises the following steps: adding a certain amount of cobalt hydroxide flashing dry dust collecting material and the hydrazine hydrate solution into a reaction kettle when synthesis is started; transforming the dust collecting material into a cobalt hydroxide precursor seed crystal under intense stirring, and synthesizing a cobaltosic oxide precursor product with the granularity of 16-18mu m by a wet method through a certain process condition; adding a certain amount of conductive carbon black into the reaction kettle after synthesis is completed, aging for a period, washing and drying the mixture, and calcining under a certain condition to obtain the large-granularity cobaltosic oxide product. By utilizing the process, the spherical or sphere-like cobaltosic oxide product having a laser granularity of16-18mu m, tap density of more than 2.0g / cm<3> and specific surface area of 1.0-3.0m<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 preparation method of large-grained cobalt trioxide used for preparing lithium cobalt oxide, a cathode material of lithium ion batteries. 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, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/03C01P2004/32C01P2004/61C01P2006/11C01P2006/12
Inventor 陈晓闯刘世红吴来红吴芳
Owner 南通金通储能动力新材料有限公司
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