Laminated high-density spherical cobalt oxyhydroxide precursor and preparation method thereof

A cobalt oxyhydroxide, high-density technology, applied in chemical instruments and methods, cobalt oxide/cobalt hydroxide, cobalt compounds, etc., can solve the problems of uneven downstream mixing, non-spherical shape, poor product stability, etc. Achieve the effects of controllable particle size and morphology, improved capacity and cycle performance, and low cost

Active Publication Date: 2021-05-14
JINCHI ENERGY MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201010117854.X discloses a method for preparing cobalt trihydroxide hydroxide. This method synthesizes cobalt trihydroxide hydroxide through a hydrothermal method. The shape is not spherical, which will lead to uneven mixing of downstream materials and product stability poor

Method used

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  • Laminated high-density spherical cobalt oxyhydroxide precursor and preparation method thereof
  • Laminated high-density spherical cobalt oxyhydroxide precursor and preparation method thereof
  • Laminated high-density spherical cobalt oxyhydroxide precursor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare a cobalt sulfate solution with a cobalt ion concentration of 2mol / L, add 0.4g / L disodium edetate to the cobalt sulfate solution, and prepare a 10mol / L sodium hydroxide solution as a precipitant. Add 60L of pure water to a reactor with a capacity of 100L, control the temperature at 70°C, adjust the pH value to 11.0 with sodium hydroxide solution, stir at a speed of 550r / min, and keep feeding the reactor at a flow rate of 50L / h Inject air for 2h;

[0039] In the nucleation stage, the temperature is controlled at 70°C, the pH value is controlled at 10.7-11.0, the stirring speed is controlled at 550r / min, the cobalt salt feed flow is controlled at 4.5L / h, and the air flow is controlled at 120-200L / h. After the particles grow to 2.5 μm, switch the reaction conditions and enter the growth stage. In the growth stage, the temperature is controlled at 75°C, the pH value is controlled at 11.0-11.4, the stirring speed is controlled at 650r / min, the cobalt salt feed flow r...

Embodiment 2

[0047] Prepare a cobalt chloride solution with a metal concentration of 1.8mol / L, add 0.5g / L ethylenediaminetetraacetic acid to the cobalt chloride solution, and prepare an 8mol / L sodium hydroxide solution as a precipitant. Add 60L of pure water to a reactor with a capacity of 100L, control the temperature at 65°C, adjust the pH value to 10.85 with sodium hydroxide solution, stir at a speed of 500r / min, and keep feeding the reactor at a flow rate of 30L / h Inject air for 4 hours;

[0048] In the nucleation stage, the temperature is controlled at 60°C, the pH value is controlled at 10.7-11.0, the stirring speed is controlled at 500r / min, the cobalt salt feed flow rate is controlled at 4.0L / h, and the air flow rate is controlled at 120-200L / h. After the particles grow to 2.0 μm, switch the reaction conditions and enter the growth stage. In the growth stage, the temperature is controlled at 78°C, the pH value is controlled at 11.0-11.4, the stirring speed is controlled at 650r / mi...

Embodiment 3

[0051] Prepare a cobalt chloride solution with a metal concentration of 2.2mol / L, add 1.0g / L disodium edetate to the cobalt chloride solution, and prepare a 5mol / L potassium hydroxide solution as a precipitant. Add 60L of pure water to a reactor with a volume of 100L, control the temperature at 68°C, adjust the pH value to 11.0 with potassium hydroxide solution, stir at a speed of 500r / min, and keep feeding the reactor at a flow rate of 20L / h Introduce oxygen for 1h;

[0052] In the nucleation stage, the temperature is controlled at 68°C, the pH value is controlled at 10.7-11.0, the stirring speed is controlled at 500r / min, the cobalt salt feed flow rate is controlled at 4.0L / h, and the oxygen flow rate is controlled at 120-200L / h. After the particles grow to 2.0 μm, switch the reaction conditions and enter the growth stage. In the growth stage, the temperature is controlled at 75°C, the pH value is controlled at 11.0-11.4, the stirring speed is controlled at 650r / min, the co...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and provides a laminated high-density spherical cobalt oxyhydroxide and a preparation method thereof. In the preparation method of the present invention, during the preparation of the cobalt salt solution, the cobalt in the cobalt salt solution is preferentially complexed by selecting a suitable complexing agent and adjusting the addition amount of the complexing agent, using temperature, pH value, stirring speed , the feed flow rate of cobalt salt, and the feed flow rate of oxidizing gas on the particle morphology and stacking degree were controlled by the two-stage method of nucleation and growth, and a class with uniform internal particle pores, dense structure, and regular shape was prepared. Spherical cobalt oxyhydroxide. The preparation method of the invention not only has simple technological process, low cost and high degree of automation, but also has controllable particle size and appearance, good crystallinity, stable and excellent quality, and can realize continuous production.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a precursor of lithium cobaltate, in particular to a laminated high-density spherical cobalt oxyhydroxide precursor and a preparation method thereof. Background technique [0002] With the rapid development of cathode materials for lithium-ion batteries, people have put forward higher requirements for the safety performance and energy density of lithium-ion batteries. Under the double stimulus of policies and markets, power batteries have developed rapidly. 3C electronics and consumer products Lithium-ion batteries have achieved sustained and stable development for decades, and will continue to maintain a steady growth trend. The official issuance of 5G licenses on June 6, 2019 marks the official commercialization of my country's 5G network, and the next generation of small smart high-end electronic consumer products such as 5G mobil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00C01G51/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G51/00C01G51/04C01P2002/72C01P2004/03C01P2004/20C01P2004/32C01P2004/50C01P2004/61C01P2004/62C01P2004/64
Inventor 吴泽盈张海艳胡志兵孟立君曾永详熊意球何绪锋朱璟苏帅刘宙
Owner JINCHI ENERGY MATERIALS CO LTD
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