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High-density spherical cobaltic-cobaltous oxide and method for preparing the same

A high-density technology of cobalt tetroxide, which is applied in the direction of cobalt oxide/cobalt hydroxide, can solve the problems of reducing the chemical activity of cobalt tetroxide, affecting the electrochemical properties of lithium cobalt oxide, and reducing the tap density, so as to improve the electrochemical performance and facilitate the process. , the effect that the particle size can be controlled

Inactive Publication Date: 2008-09-24
GUANGZHOU RONGJIE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, lithium cobalt oxide is the most widely used positive electrode material for lithium ion batteries. When preparing lithium cobalt oxide, cobalt tetroxide used is mainly prepared by calcining cobalt oxalate and cobalt carbonate, but because the synthesized cobalt oxalate and cobalt carbonate are irregular Particles, after firing, the obtained tricobalt tetroxide is also amorphous, which will reduce the tap density and increase the volume of the battery when synthesizing lithium cobalt oxide, and calcining reduces the chemical activity of tricobalt tetroxide, which ultimately affects the electrochemical properties of lithium cobalt oxide

Method used

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  • High-density spherical cobaltic-cobaltous oxide and method for preparing the same

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Embodiment 1

[0023] Use deionized water to make cobalt sulfate into 2M, ammonium citrate into 1M mixed solution, use deionized water to make potassium hydroxide into 7M, ammonia water into 2M mixed solution, open the reaction container and stir, and put 1 liter deionized water, and heated the bottom water to 40°C, cobalt sulfate was added to the reaction vessel at a flow rate of 5ml / min, and the alkaline precipitant potassium hydroxide was added to the reaction vessel at a flow rate of 5-15ml / min. Regulate the flow rate of potassium hydroxide, control the pH value to 10.5 ± 0.3, and the precipitate suspension generated by the reaction overflows to another container for aging. After aging for 6 hours, the precipitate is washed until the pH of the washing water is less than 7.5, and then Filtration, drying the filter cake at 90°C, and calcining the dried product at 450°C for 3 hours to obtain high-density spherical cobalt tetroxide with a purity of ≥99.5%.

Embodiment 2

[0025] Use deionized water to make cobalt chloride into 2M, ammonium citrate into 3M mixed solution, use deionized water to make sodium hydroxide into 4M, citric acid into 2M mixed solution, open the reaction vessel for stirring, and put in 1 liter of deionized water, and heat the bottom water to 40°C, add cobalt chloride to the reaction vessel at a flow rate of 5ml / min, and add the alkaline precipitant sodium hydroxide to the reaction vessel at a flow rate of 5-15ml / min In the process, by adjusting the flow rate of sodium hydroxide, the pH value is controlled to be 10.5±0.3, and the precipitate suspension generated by the reaction overflows to another container for aging. After aging for 6 hours, the precipitate is washed until the pH of the washing water is less than 7.5, then filter, dry the filter cake at 90°C, and then calcinate the dried product at 600°C for 8 hours to obtain high-density spherical cobalt tetroxide with a purity of ≥99.5%.

Embodiment 3

[0027] Use deionized water to make cobalt chloride into 3M, ammonium citrate into 2M mixed solution, use deionized water to make sodium hydroxide into 7M, ammonia water into 2M mixed solution, open the reaction vessel for stirring, and put 1 liters of deionized water, and heated the bottom water to 70°C, cobalt chloride was added to the reaction vessel at a flow rate of 10ml / min, and the alkaline precipitant sodium hydroxide was added to the reaction vessel at a flow rate of 10-20ml / min , by adjusting the flow rate of sodium hydroxide, the pH value is controlled to 11.5±0.3, and the precipitate suspension generated by the reaction overflows to another container for aging. After aging for 6 hours, the precipitate is washed until the pH of the washing water is less than 7.5 , and then filtered, the filter cake was dried at 105°C, and the dried product was calcined at 400°C for 5 hours to obtain high-density spherical cobalt tetroxide with a purity of ≥99.5%.

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Abstract

The invention provides a high density spherical shape Co3O4 and a preparation method thereof, and relates to a Co3O4, in particular to the preparation of the high density spherical shape Co3O4, which is mainly used for preparing lithium cobaltoxide of anode material of a lithium ion battery, and also is used as Co3O4 of electronic grade, and belongs to the products of chemical industry. The invention provides a preparation method of the high density spherical shape Co3O4 with good fluidity, the prepared Co3O4 is enabled to be a spherical shape particle which has best stacking density and can effectively improve the tap density of the particle, thereby improving the electrochemistry property of the lithium ion battery and the quality of the lithium ion battery. The Co3O4 prepared by the method is a spherical shape crystal, the mean grain size is 5-25 micrometers, the loose packed density is more than or equal to 1.0g / cm<3>, the tap density is more than or equal to 2.0g / cm<3>, and the cobalt content is more than or equal to 73 percent. The process of the method is simple, and the lithium cobaltoxide synthesized by the Co3O4 presents better property, compared with the past Co3O4, the electrochemistry property of the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to the preparation of tricobalt tetroxide, in particular high-density spherical cobalt trioxide, which is mainly used to prepare lithium cobaltate, the anode material of lithium ion batteries, and is also used as electronic grade cobalt trioxide, which belongs to chemical products. Background technique [0002] Lithium-ion battery is a new type of power source, it has many advantages such as high voltage, large capacity, safety and environmental protection, so it is widely used in the field of secondary batteries. At present, lithium cobalt oxide is the most widely used positive electrode material for lithium ion batteries. When preparing lithium cobalt oxide, cobalt tetroxide used is mainly prepared by calcining cobalt oxalate and cobalt carbonate, but because the synthesized cobalt oxalate and cobalt carbonate are irregular Particles, after firing, the obtained tricobalt tetroxide is also amorphous, which will reduce the tap den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 吕向阳左一村
Owner GUANGZHOU RONGJIE MATERIAL TECH
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