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Preparation method and application of sea urchin-shaped lithium cobalt oxide

A technology of lithium cobalt oxide and cobalt salt, which is applied in the direction of chemical instruments and methods, cobalt compounds, structural parts, etc., can solve the problems of small electrolyte infiltration area, insufficient contact, and large battery impedance, so as to facilitate infiltration and penetration. Transport of lithium ions, good rate characteristics and cycle stability, and the effect of increasing the contact area

Pending Publication Date: 2022-07-05
宜昌邦普时代新能源有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The particle size (D50) of conventional lithium cobaltate is about 10um, its specific surface area is small, the infiltration area with the electrolyte is small, the contact between particles is not close enough, the resistance of lithium ions to migrate inside the particle is relatively large, and the battery impedance is relatively large , the rate discharge performance is poor

Method used

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  • Preparation method and application of sea urchin-shaped lithium cobalt oxide
  • Preparation method and application of sea urchin-shaped lithium cobalt oxide

Examples

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Embodiment 1

[0036] In this embodiment, a sea urchin-shaped lithium cobalt oxide positive electrode material is prepared, and the specific process is as follows:

[0037] Step 1, preparation concentration is the cobalt chloride solution of 0.05mol / L;

[0038] Step 2, adding the cobalt chloride solution in step 1 into the autoclave, and the amount added is 3 / 5 of the volume of the reactor;

[0039] Step 3, in reactor, add ammonium fluoride, urea and benzoyl peroxide, make the concentration of ammonium fluoride reach 0.15mol / L, urea concentration is 0.5mol / L, and benzoyl peroxide concentration is 0.02mol / L. L;

[0040] Step 4, after sealing the reaction kettle, heat it to 90°C and maintain the reaction temperature for 12h;

[0041] Step 5, after the reaction is completed, the solid-liquid separation is performed, and the obtained solid is washed with ethanol first, and then washed with pure water;

[0042] Step 6, after the washing product is dried, it is calcined for 2 hours in an air at...

Embodiment 2

[0045] In this embodiment, a sea urchin-shaped lithium cobalt oxide positive electrode material is prepared, and the specific process is as follows:

[0046] Step 1, preparation concentration is the cobalt sulfate solution of 0.5mol / L;

[0047] Step 2, adding the cobalt sulfate solution in step 1 into the autoclave, and the amount added is 70% of the volume of the reactor;

[0048] Step 3, in the reactor, add ammonium fluoride, urea and di-tert-butyl peroxide, make the concentration of ammonium fluoride reach 1.0mol / L, urea concentration is 2.5mol / L, and the concentration of di-tert-butyl peroxide is 0.022mol / L;

[0049] Step 4, after sealing the reaction kettle, heat it to 100°C and maintain the reaction temperature for 10h;

[0050] Step 5, after the reaction is completed, the solid-liquid separation is performed, and the obtained solid is washed with ethanol first, and then washed with pure water;

[0051] Step 6, after the washing product is dried, it is calcined for 4 ...

Embodiment 3

[0054] In this embodiment, a sea urchin-shaped lithium cobalt oxide positive electrode material is prepared, and the specific process is as follows:

[0055] Step 1, preparation concentration is 1.0mol / L cobalt nitrate solution;

[0056] Step 2, adding the cobalt nitrate solution in step 1 into the autoclave, and the amount added is 4 / 5 of the volume of the reactor;

[0057] Step 3, in reactor, add ammonium fluoride, urea and lauroyl peroxide, make the concentration of ammonium fluoride reach 2.0mol / L, urea concentration is 5.0mol / L, and the concentration of lauroyl peroxide is 0.025mol / L ;

[0058] Step 4, after sealing the reaction kettle, heat it to 110°C and maintain the reaction temperature for 8h;

[0059] Step 5, after the reaction is completed, the solid-liquid separation is performed, and the obtained solid is washed with ethanol first, and then washed with pure water;

[0060] Step 6, after the washing product is dried, it is calcined for 6 hours in an air atmosph...

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Abstract

The invention discloses a preparation method and application of sea-urchin-shaped lithium cobalt oxide. The method comprises the following steps: mixing cobalt salt, ammonium fluoride, urea, an oxidant and water to obtain a mixed solution, heating for reaction, roasting the obtained solid in an oxygen-containing atmosphere, and roasting the roasted material and a lithium source to obtain lithium cobalt oxide. The lithium cobalt oxide prepared by the method forms an urchin-shaped porous structure, so that the contact area of an electrolyte and an electrode active material is increased, active sites for lithium ion deintercalation are increased, infiltration and permeation of the electrolyte and transmission of lithium ions are facilitated, and the lithium cobalt oxide has relatively good rate capability and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a preparation method and application of a sea urchin-shaped lithium cobalt oxide. Background technique [0002] In recent years, with the rapid growth of the new energy vehicle industry and the continuous expansion of the traditional energy storage field and the 3C power supply market, the demand for cathode materials for lithium-ion batteries is increasing. With the rapid development of the market, the requirements for the performance of cathode materials, especially the performance of fast charge and discharge, are also getting higher and higher. [0003] Lithium cobalt oxide electrode materials have high specific capacity and good cycle stability, and are currently widely used in the 3C field of cathode materials. With the rapid development of 3C electronic products, manufacturers continue to improve the processing per...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M4/525H01M10/0525
CPCC01G51/42H01M4/525H01M10/0525C01P2004/03C01P2006/40C01P2004/30H01M2004/028
Inventor 余海军谢英豪李爱霞张学梅李长东
Owner 宜昌邦普时代新能源有限公司
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