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Preparation method of ion-doped layered lithium cobalt oxide cathode material

A positive electrode material and ion doping technology, which is applied to battery electrodes, structural parts, electrical components, etc., can solve problems such as high cost, poor cycle performance, and high energy consumption, so as to reduce equipment costs, reduce energy consumption, and increase specific energy consumption. The effect of capacity

Active Publication Date: 2022-07-15
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, lithium cobalt oxide is the first to be commercialized due to its advantages of simple production process and stable electrochemical performance. It has the advantages of high discharge voltage, stable charge and discharge voltage, and high specific energy. important applications; however, at present, spherical cobalt oxide precursors are generally selected as raw materials, mixed with lithium and calcined to obtain lithium cobaltate. This preparation method requires high-temperature calcination, high energy consumption, and high cost; Cycling performance also limits its application

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 of the present invention also provides a method for preparing an ion-doped layered lithium cobalt oxide positive electrode material, and the method is implemented by the following steps:

[0031] Step 1, weigh 3m 3 Deionized water was added to the reaction kettle, then ammonia water and liquid caustic soda were added to the 3 Pour oxygen into the reaction kettle at a speed of / h, and stir at a speed of 200rpm for 6h in an oxygen atmosphere to obtain a bottom liquid;

[0032] Wherein, in the reaction process, the content of ammonia water is controlled to be 2.5 g / L and the pH value of the bottom liquid is 9.2 by adjusting the additions of ammonia water and liquid caustic soda;

[0033] Wherein, the liquid caustic soda is sodium hydroxide solution;

[0034] Step 2, the prepared 100g / L cobalt chloride, 100g / L lithium chloride and 3g / L magnesium chloride are respectively added to the reactor at the feed rate of 80L / h, 80L / h and 20L / h, Ammonia water and liqui...

Embodiment 2

[0038] Embodiment 2 of the present invention also provides a method for preparing an ion-doped layered lithium cobalt oxide positive electrode material, and the method is implemented by the following steps:

[0039] Step 1, weigh 3m 3 Deionized water was added to the reaction kettle, then ammonia water and liquid caustic soda were added to the 3 Pour oxygen into the reaction kettle at a speed of / h, and stir at a speed of 200rpm for 6h in an oxygen atmosphere to obtain a bottom liquid;

[0040] Wherein, in the reaction process, the content of ammonia water is controlled to be 3g / L and the pH value of bottom liquid is 9.4 by adjusting the additions of ammonia water and liquid caustic soda;

[0041] Wherein, the liquid caustic soda is sodium hydroxide solution;

[0042] Step 2, the prepared 80g / L cobalt chloride, 80g / L lithium chloride and 3g / L magnesium chloride are respectively added to the reactor at the feed rate of 20L / h, 20L / h and 20L / h, Ammonia water and liquid caustic...

Embodiment 3

[0046] Embodiment 3 of the present invention also provides a method for preparing an ion-doped layered lithium cobalt oxide positive electrode material, and the method is implemented by the following steps:

[0047] Step 1, weigh 3m 3 Deionized water was added to the reaction kettle, then ammonia water and liquid caustic soda were added to the 3 Pour oxygen into the reaction kettle at a speed of / h, and stir at a speed of 200rpm for 6h in an oxygen atmosphere to obtain a bottom liquid;

[0048] Wherein, in the reaction process, the content of ammonia water is controlled to be 1.5g / L and the pH value of the bottom liquid is 9.0 by adjusting the additions of ammonia water and liquid caustic soda;

[0049] Wherein, the liquid caustic soda is sodium hydroxide solution;

[0050] Step 2, the prepared 120g / L cobalt chloride, 120g / L lithium chloride and 3g / L magnesium chloride are respectively added to the reactor at the feed rate of 100L / h, 100L / h and 20L / h, Ammonia water and liqu...

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Abstract

The invention discloses a preparation method of an ion-doped layered lithium cobalt oxide positive electrode material. The method comprises the following steps: adding deionized water, ammonia water and liquid alkali into a reaction kettle to prepare a bottom liquid; then adding cobalt chloride, chlorinated Lithium, metal dopant, ammonia water and liquid caustic soda are added to the reaction kettle, and the feeding speed is adjusted to control the reaction. When the solid content in the reaction kettle reaches a certain value, the feeding is stopped to obtain the reaction slurry; finally, the reaction slurry is aged, Centrifugal washing and drying to obtain an ion-doped layered lithium cobalt oxide positive electrode material; the present invention directly obtains an ion-doped layered lithium cobalt oxide positive electrode material through liquid phase synthesis, and the positive electrode material has a layered structure and ion doping, It can improve the transport of electrons and lithium ions, thereby improving the specific capacity, rate performance and cycle performance of the material; in addition, the use of liquid phase synthesis greatly shortens the synthesis time, reduces high-temperature calcination, greatly reduces energy consumption, and improves production. efficiency.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and particularly relates to a method for preparing an ion-doped layered lithium cobalt oxide positive electrode material. Background technique [0002] Due to its high energy density, high power density, good cycle performance, no memory effect, and green environmental protection, lithium-ion batteries are widely used in mobile communication devices such as mobile phones, mobile cameras, notebook computers, mobile phones and other electronic products. , and is also a strong candidate in the energy supply system of future electric vehicles. [0003] In the prior art, lithium cobalt oxide is the first to be commercialized due to its simple production process and stable electrochemical performance. It has the advantages of high discharge voltage, stable charge and discharge voltage, and high specific energy. However, at present, spherica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/525H01M4/626H01M10/0525Y02E60/10
Inventor 许开华张云河叶建陈元骁
Owner JINGMEN GEM NEW MATERIAL