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Preparation method of spherical hydroxy cobalt oxide

A cobalt oxyhydroxide, spherical technology, applied in the field of preparation of spherical cobalt oxyhydroxide, can solve the problems of complex process, difficult particle size control, loose secondary particle structure, etc., and achieves the effects of simple process, low cost and high energy density

Active Publication Date: 2014-01-01
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the secondary particle structure of cobalt oxyhydroxide obtained by this method is loose, the particle size is difficult to control, and the process is complicated, which cannot meet the requirements of lithium cobaltate to increase energy density and reduce cost.

Method used

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  • Preparation method of spherical hydroxy cobalt oxide
  • Preparation method of spherical hydroxy cobalt oxide
  • Preparation method of spherical hydroxy cobalt oxide

Examples

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preparation example Construction

[0017] The embodiment of the present invention provides a method for preparing spherical cobalt oxyhydroxide. The method utilizes the controlled crystallization method to react the reactants in a controlled crystallization tank with a buffer while performing non-uniform stirring, specifically comprising the following steps:

[0018] S1, providing a controlled crystallization kettle;

[0019] S2, injecting a buffer into the controlled crystallization tank, the buffer is used to control the reaction speed of the reactants;

[0020] S3, using the cobalt salt solution and the alkaline solution as reactants, injecting the controlled crystallization kettle with a buffer; and

[0021] S4. Stir the reactant only at the bottom area of ​​the tank body of the controlled crystallization tank while reacting the reactant, so as to prepare spherical cobalt oxyhydroxide by a controlled crystallization method.

[0022] see figure 1 , The controlled crystallization kettle 100 includes a kettl...

Embodiment 1

[0053] 1) Add 4 mol / L ammonia solution into a 4-liter controlled crystallization kettle as a buffer, mechanically stir vigorously at 1,500 rpm, and slowly add 2 mol / L chloride from both sides with a peristaltic pump Cobalt aqueous solution and 4 mol / L sodium hydroxide aqueous solution, the feed rate is controlled at 0.5 milliliters per minute to obtain spherical cobalt oxyhydroxide.

[0054] 2) Take out the reaction product spherical cobalt oxyhydroxide in 1), repeatedly wash with deionized water and suction filter to preserve the obtained spherical cobalt oxyhydroxide;

[0055] 3) Mix 1 kg of the spherical cobalt oxyhydroxide obtained in 2) with an aqueous solution containing 400 g of saturated lithium hydroxide and put it into a high-pressure hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction kettle should be heated rapidly to 150°C and Insulated for 5 hours to obtain spherical lithium cobaltate;

[0056] 4) Take out the reaction product lithi...

Embodiment 2

[0060] 1) Add 8 mol / L ammonia solution in a 10-liter controlled crystallization kettle as a buffer, mechanically stir vigorously, the stirring intensity is 900 rpm, and slowly add 3 mol / L chloride from both sides with a peristaltic pump Cobalt aqueous solution and 6 mol / L sodium hydroxide aqueous solution, the feeding speed of two kinds of solutions all is controlled at 2 milliliters per minute, obtains spherical cobalt oxyhydroxide.

[0061] 2) Take out the reaction product spherical cobalt oxyhydroxide in 1), repeatedly wash with deionized water and suction filter to preserve the obtained spherical cobalt oxyhydroxide;

[0062] 3) Mix 3 kg of the spherical cobalt oxyhydroxide obtained in 2) with an aqueous solution containing 1 kg of saturated lithium hydroxide and put it into a high-pressure hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction kettle should be heated rapidly to 200°C and Insulated for 1 hour to obtain spherical lithium cobaltate...

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Abstract

The invention relates to a preparation method of spherical hydroxy cobalt oxide. The preparation method comprises the following steps of: providing a control crystallization kettle; feeding a buffer agent which is used for controlling the reaction speed of reactants into the control crystallization kettle; feeding a cobalt salt solution and an alkaline solution into the control crystallization kettle with the buffer agent, wherein a cobalt salt solution and an alkaline solution are used as the reactants; and only stirring the reactants within the bottom area of the kettle body of the control crystallization kettle while the reactants react with each other, so as to prepare the spherical hydroxy cobalt oxide by means of control crystallization method.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for preparing spherical cobalt oxyhydroxide used for manufacturing lithium cobaltate. Background technique [0002] The rapid development of mobile electronic devices represented by smart phones, tablet computers, notebook computers, mobile tools, etc. is based on the development of lithium-ion battery preparation technology. Small mobile electronic devices have almost strict requirements on technical indicators such as battery safety, thermal stability and cycle life. It is precisely because of the high standards of battery safety and reliability that the positive electrode material lithium cobalt oxide, which plays a supporting role in the entire industry at the current stage, is difficult to be replaced in the foreseeable future. [0003] Lithium cobalt oxide is the most widely used positive electrode active material. As one of the raw materials for p...

Claims

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Application Information

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IPC IPC(8): C01G51/04
CPCC01G51/42C01P2002/72C01P2004/32H01M4/525C01G51/04Y02E60/10H01M4/48H01M10/0525H01M2220/30
Inventor 方谋王要武何向明王莉尚玉明高剑郭建伟毛宗强
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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