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High-voltage lithium cobalt oxide coated material aluminum-doped cobalt hydroxide and preparation method thereof

A technology of cobalt hydroxide and coating material, applied in cobalt oxide/cobalt hydroxide, circuits, electrical components, etc., can solve the problems of easy agglomeration and adhesion, high activity, strong adsorption capacity, etc.

Inactive Publication Date: 2021-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are the following difficulties in aluminum-doped cobalt hydroxide: 1. Submicron cobalt hydroxide itself has small particles, large specific surface area, high activity, and is easy to agglomerate and stick in the wet synthesis stage; 2. After doping with aluminum, due to the concentration of aluminum in the reaction system Small, easy to produce aluminum hydroxide jelly, its specific surface is large, strong adsorption capacity, can absorb cobalt hydroxide to deepen the particle agglomeration phenomenon, and the higher the amount of aluminum doping, the more serious the particle agglomeration phenomenon

Method used

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  • High-voltage lithium cobalt oxide coated material aluminum-doped cobalt hydroxide and preparation method thereof
  • High-voltage lithium cobalt oxide coated material aluminum-doped cobalt hydroxide and preparation method thereof
  • High-voltage lithium cobalt oxide coated material aluminum-doped cobalt hydroxide and preparation method thereof

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Effect test

Embodiment 1

[0024] 1. Prepare 80g / L cobalt sulfate solution and stir evenly;

[0025] 2. Dissolve aluminum sulfate into 80g / L sodium hydroxide to make the aluminum ion concentration 2g / L;

[0026] 3. Dissolve and dilute sodium hydroxide with water to prepare an alkali solution with a concentration of 40g / L;

[0027] 4. Add pure water to the reaction kettle as the bottom liquid, adjust the pH to 11.0-11.2 with sodium hydroxide, add sodium borohydride and sodium hexametaphosphate to the bottom liquid, start stirring, the speed is 80 rpm, and the temperature is controlled at At 40°C, add cobalt salt solution, aluminum-doped solution and alkali solution at the same time. The flow rate of the cobalt salt solution is 200L / h, and the relationship between the flow rate of the aluminum-doped solution and the flow rate of the cobalt salt solution is as follows: the mass ratio of aluminum to cobalt is 0.017:1, and the pH of the process is strictly controlled within the range of 11.0 to 11.2 by cont...

Embodiment 2

[0031] 1. Prepare 120g / L cobalt chloride solution and stir evenly;

[0032] 2. Dissolve aluminum chloride into 100g / L sodium hydroxide to make an aluminum ion concentration of 6g / L;

[0033] 3. Dissolve and dilute sodium hydroxide with water to prepare a 60g / L alkali solution

[0034] 4. Add pure water to the reaction kettle as the bottom liquid, adjust the pH to 11.4-11.6 with sodium hydroxide, add acetone oxime, polyethylene glycol and medium-chain triglycerides to the bottom liquid, start stirring at 200 rpm , the temperature is controlled at 55°C, and cobalt salt solution, aluminum-doped solution and alkali solution are added at the same time. The flow rate of the cobalt salt solution is 600L / h, and the relationship between the flow rate of the aluminum-doped solution and the flow rate of the cobalt salt solution is as follows: the mass ratio of aluminum to cobalt is 0.054:1, and the pH of the process is strictly controlled within the range of 11.4 to 11.6 by controlling ...

Embodiment 3

[0038] 1. Prepare 160g / L cobalt nitrate solution and stir evenly;

[0039] 2. Dissolve aluminum nitrate in 120g / L sodium hydroxide to make the aluminum ion concentration 10g / L;

[0040] 3. Dissolve and dilute sodium hydroxide with water to prepare an alkali solution with a concentration of 80g / L

[0041] 4. Add pure water to the reaction kettle as the bottom solution, adjust the pH to 11.8-12.0 with sodium hydroxide, add hydrazine hydrate and sodium dodecylbenzenesulfonate to the bottom solution, start stirring, and the speed is 300 rpm. The temperature is controlled at 70°C, and cobalt salt solution, aluminum-doped solution and alkali solution are added at the same time. The flow rate of the cobalt salt solution is 1000L / h, and the relationship between the flow rate of the aluminum-doped solution and the flow rate of the cobalt salt solution is as follows: the mass ratio of aluminum to cobalt is 0.092:1, and the pH of the process is strictly controlled within the range of 11...

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Abstract

The invention provides a high-voltage lithium cobalt oxide coated material aluminum-doped cobalt hydroxide and a preparation method thereof, and is mainly used in the technical field of preparation of lithium battery positive electrode materials. The method comprises the following steps: 1, preparing a cobalt salt solution, a sodium metaaluminate solution and a sodium hydroxide solution; 2, adding pure water into a reaction kettle, adjusting the pH value to be 11.0-12.0 by using sodium hydroxide, adjusting the temperature to be 40-70 DEG C, stirring at 80-300rpm, adding the three solutions at the same time, controlling the pH value to be 11.0-12.0 in the process, controlling the feeding reaction time to be 4-8 hours, and stirring and dispersing for 0.2-0.4 hour after the feeding is finished; and 3, carrying out filter pressing, washing and drying on the synthesized aluminum-doped cobalt hydroxide, and crushing the aluminum-doped cobalt hydroxide by adopting a jet mill to finally obtain the agglomeration-free submicron aluminum-doped cobalt hydroxide. According to the invention, the problem of adhesion between submicron particles is effectively solved, and the prepared aluminum-doped cobalt hydroxide has a very good coating effect.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode material preparation, and in particular relates to a preparation method of aluminum-doped cobalt hydroxide, a high-voltage lithium cobalt oxide coating material. Background technique [0002] Lithium cobalt oxide is the preferred cathode material for batteries of 3C electronic products such as mobile phones, notebook computers, and digital cameras. The higher the lithium ion battery's large capacity and high rate, etc., mainly depend on the performance of the positive electrode material lithium cobalt oxide. By increasing the charge cut-off voltage of LCO and allowing more lithium ions to participate in charge and discharge, the specific capacity of lithium cobalt oxide can be improved. At present, the charging cut-off voltage of lithium cobalt oxide has officially stepped from 4.4V to 4.45V, and 4.5V is an inevitable trend for the development of high-voltage lithium cobalt oxide ...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/525
CPCC01G51/04H01M4/525C01P2004/03C01P2004/62Y02E60/10
Inventor 徐伟
Owner CENT SOUTH UNIV
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