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

A technology of cobalt tetroxide with small particle size, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of large particle size of cobalt tetroxide, difficult to control the preparation process, easy to sinter, etc., to achieve uniform and controllable particle size, good sphericity, and saving effect of time

Active Publication Date: 2020-12-01
张甘泉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is not easy to control, and the obtained cobalt tetroxide has a large particle size and a large particle size range, which is prone to sintering

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, small pellets of cobalt tetroxide were prepared through the following steps:

[0030] (1) Preparation solution: Dissolve cobalt sulfate in hot water at 80°C to obtain a cobalt salt solution with a concentration of 1.6mol / L; dissolve ammonium carbonate in hot water at 80°C to obtain a cobalt salt solution with a concentration of 10mol / L Bottom fluid;

[0031] (2) Colloidal reaction: Stir the bottom liquid prepared in step (1) at room temperature at a speed of 30 rpm, add the cobalt salt solution prepared in step (1) to the stirred bottom liquid at a constant speed, and add the cobalt salt solution every minute The volume of the solution is 7% of the volume of the bottom liquid. During the process of adding the cobalt salt solution, the bottom liquid is treated with 20KHz ultrasonic waves. The processing time is 30 minutes after the addition of the cobalt salt solution, so that the reaction forms a great supersaturation and produces a uniform floc colloi...

Embodiment 2

[0037] In this example, small pellets of cobalt tetroxide were prepared through the following steps:

[0038] (1) Preparation solution: Dissolve cobalt chloride in hot water at 60°C to obtain a cobalt salt solution with a concentration of 2mol / L; dissolve ammonium carbonate in hot water at 60°C to obtain a cobalt salt solution with a concentration of 15mol / L Bottom fluid;

[0039] (2) Colloidal reaction: Stir the bottom liquid prepared in step (1) at a speed of 50 rpm at room temperature, add the cobalt salt solution prepared in step (1) into the stirred bottom liquid at a constant speed, and add the cobalt salt solution every minute The volume of the solution is 5% of the volume of the bottom liquid. During the process of adding the cobalt salt solution, the bottom liquid is treated with 25KHz ultrasonic waves. The processing time is 30 minutes after the addition of the cobalt salt solution, so that the reaction forms a great supersaturation and produces a uniform floc collo...

Embodiment 3

[0045] In this example, small pellets of cobalt tetroxide were prepared through the following steps:

[0046] (1) Preparation solution: Dissolve cobalt nitrate in hot water at 60°C to obtain a cobalt salt solution with a concentration of 1.5mol / L; dissolve ammonium bicarbonate in hot water at 60°C to obtain a concentration of 11mol / L bottom liquid;

[0047] (2) Colloidal reaction: Stir the bottom liquid prepared in step (1) at room temperature at a speed of 40 rpm, add the cobalt salt solution prepared in step (1) to the stirred bottom liquid at a constant speed, and add the cobalt salt solution every minute The volume is 3% of the volume of the bottom liquid. During the process of adding the cobalt salt solution, the bottom liquid is treated with 40KHz ultrasonic waves. The processing time is 30 minutes after the addition of the cobalt salt solution, so that the reaction forms a great supersaturation and produces a uniform floc colloid. When the molar ratio of cobalt nitrat...

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Abstract

The invention discloses a method for preparing a cobaltosic oxide with a small and uniform particle size and belongs to the technical field of inorganic chemicals. The method comprises the following steps: (1) dissolving a cobalt salt into hot water so as to obtain a 1.0-2.0mol / L cobalt salt solution, and dissolving a precipitant into hot water so as to obtain a 10-15mol / L base solution, wherein the precipitant is ammonium carbonate or ammonium bicarbonate; (2) rapidly stirring the base solution under a normal temperature condition, and uniformly putting the cobalt salt solution into the stirred base solution at a uniform speed to generate uniform flocculent colloid, wherein the mole ratio of the cobalt salt to the precipitant is 1:3; (3) rapidly heating the flocculent colloid to 40-60 DEGC, leaving to stand and age under a heat preservation condition so as to obtain an aged liquid with a cobaltosic oxide precursor, and carrying out steps of filtration, pulping, washing and calcining,thereby obtaining the cobaltosic oxide. By adopting the method, complexing reactions of the precipitant and a polycondensation reaction of the flocculent colloid of an extreme large supersaturation degree are sufficiently utilized, a microwave technique is creatively used, and a product of a uniform and controllable particle size, a complete sphericity degree and a large specific surface area canbe produced.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry, and in particular relates to a method for preparing tricobalt tetroxide with small and uniform particle size. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices because of their advantages such as high energy density, long cycle life, no memory effect, and environmental protection. With the intelligent development of electronic equipment, its functions are becoming more and more complete, coupled with the enhancement of user experience requirements, resulting in a gradual increase in its power consumption, and improving the endurance of the battery used has become an urgent problem to be solved, while the fast charging feature is affecting the battery. important factor in endurance. [0003] It has been found through research that the polarization generated by electron transfer has an important impact on the high-rate charge-discharge pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/32C01P2006/11C01P2006/12
Inventor 沈辉
Owner 张甘泉
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