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High-voltage lithium cobalt oxide positive electrode active material and preparation method and application thereof

A positive active material and active material technology, applied in the field of high-voltage lithium cobalt oxide positive active material and its preparation, can solve the problems of poor thermal stability and safety performance

Inactive Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium cobalt oxide is the main positive active material with high energy density. Increasing its upper limit operating voltage and gram capacity is considered to be an effective way to increase energy density. However, after increasing the operating voltage, the thermal stability and safety performance of lithium cobalt oxide positive active material will be much worse accordingly

Method used

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  • High-voltage lithium cobalt oxide positive electrode active material and preparation method and application thereof
  • High-voltage lithium cobalt oxide positive electrode active material and preparation method and application thereof
  • High-voltage lithium cobalt oxide positive electrode active material and preparation method and application thereof

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Embodiment 1

[0099] The positive electrode active material has a core-shell structure, including a core material and a shell structure, wherein the core material includes a large particle lithium cobaltate A1 and a small particle lithium cobaltate A2, and the chemical composition of the large particle lithium cobaltate A1 and the small particle lithium cobaltate A2 is uniform. for Li 1.03 co 0.987 Al 0.01 Mg 0.002 Y 0.001 o 2 , where the D of the large particle lithium cobaltate A1 50 17.5μm, D of small particle lithium cobaltate A2 50 The mass ratio of large particle lithium cobaltate A1 to small particle lithium cobaltate A2 is 8:2, and the shell structure is TiO 2 ;

[0100] The preparation method of the positive electrode active material comprises the following steps:

[0101] (1) Dissolve CoSO with deionized water 4 、Al 2 (SO 4 ) 3 , configured as a mixed salt solution with a molar ratio of Co:Al=98.7:1, and the Co in the mixed salt solution 2+ The concentration of the so...

Embodiment 2

[0106] The positive electrode active material has a core-shell structure, including a core material and a shell structure, wherein the core material includes large particles of lithium cobaltate A1 and small particles of lithium cobaltate A2, and the chemical composition of large particles of lithium cobaltate A1 is Li 1.03 co 0.987 Al 0.01 Mg 0.002 Y 0.001 o 2 , D of large particle lithium cobalt oxide A1 50 17.5μm, the chemical composition of small particles of lithium cobaltate A2 is Li 1.03 co 0.965 Al 0.015 Mg 0.02 o 2 , D of small particle lithium cobaltate A2 50 The mass ratio of large particle lithium cobaltate A1 to small particle lithium cobaltate A2 is 8:2, and the shell structure is AlF 3 Wherein, the preparation method of large particle lithium cobaltate A1 is the same as embodiment 1, and the preparation method of small particle lithium cobaltate A2 comprises the steps:

[0107] (1) Dissolve CoSO with deionized water 4 、Al 2 (SO 4 ) 3 , configured ...

Embodiment 3

[0112] Positive electrode active materials include large particle positive electrode active materials and small particle positive electrode active materials. Large particle positive electrode active materials have a core-shell structure, including core materials and shell structures. The core material is large particle lithium cobaltate A1, and its chemical composition is Li 1.03 co 0.987 Al 0.01 Mg 0.002 Y 0.001 o 2 , D of large particle lithium cobalt oxide A1 50 18.5μm, the shell structure is Al 2 o 3 The small particle positive electrode active material has a core-shell structure, including a core material and a shell structure, wherein the core material is a small particle lithium cobaltate A2, and its chemical composition is Li 1.03 co 0.987 Al 0.01 Mg 0.002 Y 0.001 o 2 , D of small particle lithium cobaltate A2 50 5μm, the shell structure is AlF 3 and TiO 2 The mass ratio of large particle positive electrode active material and small particle positive elec...

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Abstract

The invention provides a high-voltage lithium cobalt oxide positive electrode active material and a preparation method and application thereof. The high-voltage lithium cobalt oxide positive electrodeactive material has a core-shell structure, and a precursor Me3O4 containing Al and Z-doped cobalt is used as a raw material, wherein both the Al element and the Z element replace cobalt ions, so that the stability of the layered structure in the charging and discharging process is guaranteed, and frequent conversion between a layered hexagonal system and a spinel monoclinic system in the charging and discharging process of lithium cobalt oxide is avoided. Meanwhile, by means of a shell coating means formed on the surface, decomposition reaction caused by direct contact between electrolyte and high-concentration tetravalent cobalt ions on the surface of the positive electrode and dissolution and gas release of the cobalt ions in the electrolyte are avoided, and potential safety hazards caused by collapse of a local structure of the surface layer of particles along with increase of the dissolution amount of the cobalt ions on the surface layer are avoided; and corrosion of HF generatedby reaction of the electrolyte and a small amount of water in the lithium cobalt oxide core structure to a positive electrode active substance can be avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage lithium cobaltate positive electrode active material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have high energy density, high working voltage, environmental friendliness, and strong manufacturability, and are currently widely used in mobile phones, notebook computers, electric vehicles, and energy storage fields. With the continuous improvement of people's requirements for the performance of electronic equipment, higher requirements are put forward for the volume energy density of lithium-ion batteries. Increasing the charging voltage of positive active materials can improve the discharge capacity and discharge voltmeter platform, which can be effectively Increase volumetric energy density. However, as the charging voltage increases, the requirements for thermal stability and saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/131H01M4/525H01M4/02
CPCH01M4/366H01M4/525H01M4/131H01M2004/028H01M2004/021Y02E60/10
Inventor 于丽秋曾家江李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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