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Method for preparing large-particle spherical narrow-distribution tricobalt tetroxide used for high-voltage lithium cobaltate

A technology of cobalt trioxide and large particles, which is applied in the field of lithium-ion batteries, can solve the problems of narrow particle size distribution, low tap density, poor stability, etc., and achieve the effects of narrow particle size distribution, complete crystal form and good sphericity

Active Publication Date: 2019-09-10
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of poor stability, small particle size, wide particle size distribution, poor shape and low tap density of the existing cobaltous hydroxide series cobalt tetroxide, the present invention provides a large particle for high-voltage lithium cobaltate with stable product performance The production method of spherical narrow distribution cobalt tetroxide, the median diameter of cobalt tetroxide (D 50 ) for 18μm≤D 50 ≤20μm, D 10 ≥15μm, D 90 ≤25μm, narrow particle size distribution, tap density ≥2.5g / cm 3 , which can meet the development needs of high-voltage lithium cobalt oxide

Method used

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  • Method for preparing large-particle spherical narrow-distribution tricobalt tetroxide used for high-voltage lithium cobaltate
  • Method for preparing large-particle spherical narrow-distribution tricobalt tetroxide used for high-voltage lithium cobaltate
  • Method for preparing large-particle spherical narrow-distribution tricobalt tetroxide used for high-voltage lithium cobaltate

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Embodiment 1

[0024] A preparation method of large-particle spherical narrow-distribution cobalt tetroxide for high-voltage lithium cobaltate, comprising a continuous production stage of large-particle spherical narrow-distribution cobalt carbonate and a large-particle spherical narrow-distribution cobalt carbonate calcination stage;

[0025] The continuous production stage of the large particle spherical narrow distribution cobalt carbonate comprises the following steps:

[0026] a, nucleation growth process: add concentration 240g / L ammonium bicarbonate bottom liquid in the crystal nucleation kettle, the cobalt chloride solution of total metal ion concentration 110g / L with the flow rate of 350L / h and the ammonium bicarbonate of concentration 240g / L The solution is fed into the crystal nucleation tank at a flow rate of 150-1000L / h in parallel for nucleation reaction, the pH value is controlled at 6.8-8.5, the reaction time is 3.5h, and the nucleus grows to a median diameter of 8.5 microns; ...

Embodiment 2

[0037] The continuous production stage of the large particle spherical narrow distribution cobalt carbonate comprises the following steps:

[0038] a, nucleation growth process: add concentration 200g / L ammonium bicarbonate bottom liquid in the crystal nucleation kettle, the cobalt sulfate solution of total metal ion concentration 90g / L with the flow rate of 450L / h and the ammonium bicarbonate solution of concentration 200g / L The flow rate of 150-1000L / h is fed into the crystal nucleation tank for nucleation reaction, the pH value is controlled at 6.8-8.5, the reaction time is 3 hours, and the nucleus grows to a median diameter of 9.4 microns;

[0039] b. Particle primary growth process: add the ammonium bicarbonate base solution with a concentration of 200g / L in the primary reaction kettle, add the slurry in the crystal nucleation kettle to the primary reaction kettle, open the stirring device, and at the same time, the total metal ion concentration The cobalt sulfate solutio...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing large-particle spherical narrow-distribution tricobalt tetroxide used for high-voltage lithium cobaltate. The method includes a stage of continuously producing large-particle spherical narrow-distribution cobalt carbonate, and a stage of calcining the large-particle spherical narrow-distribution cobalt carbonate. A large-particle cobalt carbonate precursor prepared by continuous centrifugation to improve the solid content and the continuous synthesis method in is the cobalt carbonatewet-process synthesis stage is dense, narrow in particle size distribution and good in sphericity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of large-particle spherical narrow-distribution tricobalt tetroxide for high-voltage lithium cobaltate. Background technique [0002] Lithium-ion batteries are favored because of their high voltage, high energy density, long cycle life, and low environmental pollution. In recent years, with the further growth of demand for small portable power sources, good opportunities have been created for the development of the lithium-ion battery industry. The rapid development of the lithium-ion battery industry has driven lithium cobaltate, nickel-cobalt lithium With the rapid development of cathode materials such as lithium, the demand for cathode materials for lithium-ion batteries has also increased significantly. Especially in recent years, with the rapid development of the digital product industry, people's demand for high energy density lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G51/06C01G51/00
CPCC01G51/04C01G51/06C01G51/42C01P2004/32C01P2004/52C01P2004/61C01P2006/11
Inventor 智福鹏江名喜马骞王娟辉陈晓闯吴来红刘世红郝亚莉吴晖君祁世青鲁相杰张振华颉颐何艳吴芳冯燕吴婧
Owner JINCHUAN GROUP LIMITED
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