Cobalt oxyhydroxide and preparation method thereof, lithium cobaltate, electrode and lithium ion battery

A technology of cobalt oxyhydroxide and lithium cobalt oxide is applied in the fields of lithium cobalt oxide, cobalt oxyhydroxide and their preparation, electrodes and lithium ion batteries, which can solve the problems of low specificity, unsuitable charging and discharging performance for supercapacitors, etc. Effects of excellent, good ion scattering behavior, good electrical conductivity

Active Publication Date: 2022-02-01
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently prepared cobalt oxyhydroxide is basically spherical. The precursor of this shape has good repeatability and low specificity. The charge and discharge performance is not suitable for supercapacitors.

Method used

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  • Cobalt oxyhydroxide and preparation method thereof, lithium cobaltate, electrode and lithium ion battery
  • Cobalt oxyhydroxide and preparation method thereof, lithium cobaltate, electrode and lithium ion battery
  • Cobalt oxyhydroxide and preparation method thereof, lithium cobaltate, electrode and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A cobalt chloride aqueous solution with a concentration of 70 g / L was configured as a cobalt salt solution; an aqueous potassium hydroxide solution with a mass concentration of 32% was configured as an alkaline solution, and magnesium chloride was dissolved in pure water to configure a doping solution with a concentration of 0.4 g / L; The aqueous solution of sodium hypochlorite is used as the oxidant, and the disodium EDTA is used as the complexing agent.

[0070] Control the mass ratio of cobalt salt to oxidant to be 10:1, and the mass ratio of cobalt salt to complexing agent to be 50:1. Add cobalt salt solution, doping solution, alkaline solution, oxidant, complexing agent and pure water to 100L of reaction In the kettle, the stirring speed was controlled to 2000rmp, the reaction temperature was 50°C, and pH=9. After reacting for a period of time, the material is discharged to obtain flower-shaped cobalt oxyhydroxide with a particle size of 3-4 μm.

[0071] The prepar...

Embodiment 2

[0073] A cobalt sulfate aqueous solution with a concentration of 160 g / L was configured as a cobalt salt solution; a sodium hydroxide aqueous solution with a mass concentration of 32% was configured as an alkaline solution, and aluminum sulfate was dissolved in part of the alkaline solution, and pure water was added to configure a concentration of 0.6 g / L. Doping solution; Sodium peroxide solution is used as oxidant and EDTA is used as complexing agent.

[0074] The mass ratio of cobalt salt to oxidant is controlled to be 15:1, and the mass ratio of cobalt salt to complexing agent is 100:1. The cobalt salt solution, doping solution, remaining alkaline solution and oxidant are added to the device at a flow rate of 1L / h. In a 100L reaction kettle with a complexing agent and pure water, the stirring speed was controlled to 4000rmp, the reaction temperature was 70°C, and the pH was 10. After reacting for a period of time, the material is discharged to obtain cobalt oxyhydroxide. ...

Embodiment 3

[0079] A cobalt nitrate aqueous solution with a concentration of 150 g / L was configured as a cobalt salt solution; a lithium hydroxide aqueous solution with a mass concentration of 32% was configured as an alkaline solution, and nickel sulfate was dissolved in pure water to configure a doping solution with a concentration of 0.5 g / L; Sodium perchlorate is used as oxidant and amino acid is used as complexing agent.

[0080] The mass ratio of cobalt salt and oxidant is controlled to be 12:1, and the mass ratio of cobalt salt to complexing agent is 60:1. The cobalt salt solution, doping solution, alkali solution and oxidant are added to the complex with a flow rate of 3L / h. In the 100L reaction kettle of the mixture and pure water, the stirring speed was controlled to 3000rmp, the reaction temperature was 55°C, and the pH was 11. After reacting for a period of time, the material is discharged to obtain cobalt oxyhydroxide.

[0081] The cobalt oxyhydroxide is passed into the cent...

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Abstract

The invention provides a cobalt oxyhydroxide and a preparation method thereof, lithium cobaltate, an electrode and a lithium ion battery. The preparation method of cobalt oxyhydroxide comprises: mixing raw materials, stirring and reacting to obtain the cobalt oxyhydroxide; the raw materials include cobalt salt solution, doping solution, alkali solution, oxidizing agent and complexing agent. Cobalt oxyhydroxide is prepared by using the preparation method, and the cobalt oxyhydroxide is in the shape of a flower. Lithium cobaltate is prepared using the cobalt oxyhydroxide. The electrode is made of lithium cobalt oxide. Lithium-ion batteries include lithium-ion battery electrodes. The flower-shaped cobalt oxyhydroxide prepared by the preparation method provided by the application has a divergent shape and a large specific surface area, which is conducive to increasing the contact area between the electrolyte and the electrode, thereby improving the transfer efficiency of electrons; the prepared electrode has a high Capacitance value, good electrical conductivity and ion scattering behavior as well as high cycle stability and high charge-discharge efficiency.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a cobalt oxyhydroxide and a preparation method thereof, lithium cobalt oxide, an electrode and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in various mobile devices, especially lithium cobalt oxide batteries are widely used, and the performance requirements for battery cycle life, stability and safety are getting higher and higher, so the application of lithium cobalt oxide There are also strict requirements. As one of the raw materials for preparing lithium cobalt oxide, cobalt oxyhydroxide has an extremely important influence on the properties of the final lithium cobalt oxide. Therefore, the morphology control of cobalt oxyhydroxide is a controllable means to improve the performance of lithium cobalt oxide. [0003] So far, cobalt oxyhydroxide with various morphologies has been prepared by various methods, such as coba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04H01M4/525H01M10/0525
CPCC01G51/04H01M4/525H01M10/0525Y02E60/10
Inventor 资旭晖徐祥王一乔訚硕
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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