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Lithium cobalt oxide precursor with coating structure and preparation method and application thereof

A coating structure and precursor technology, which is applied in the field of cathode material precursor preparation, can solve the problems of large amount of lithium cobalt oxide delithiation/intercalation, limited coating effect, failure of coating protection effect, etc., to improve the structure Stability and thermal stability, improvement of cycle performance and safety performance, and the effect of inhibiting the dissolution of metal elements

Active Publication Date: 2021-04-13
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of lithium delithiation / intercalation of lithium cobaltate, a certain volume change will occur during the cycle.
After a long cycle, the interface between some cladding materials and lithium cobalt oxide will be separated, thus causing the protective effect of the cladding layer to fail.
[0006] The existing technology is mainly to coat after the synthesis of lithium cobalt oxide. Although the electrochemical performance of lithium cobalt oxide is significantly improved by the coating material, the bonding force between the coating material and lithium cobalt oxide is poor, and it is not easy to Uniform coating or falling off during the stirring process of the lithium cobalt oxide slurry, or a certain volume change due to the large amount of lithium delithiation / intercalation of lithium cobalt oxide during the charge-discharge cycle
After a long cycle, the interface between some cladding materials and lithium cobalt oxide will be separated, thus causing the protective effect of the cladding layer to fail.
These conditions severely limit the coating effect
In addition, when multiple elements are required to be coated at the same time, selective coating also occurs, that is, the coating material is unevenly distributed on the surface of lithium cobalt oxide particles

Method used

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  • Lithium cobalt oxide precursor with coating structure and preparation method and application thereof
  • Lithium cobalt oxide precursor with coating structure and preparation method and application thereof
  • Lithium cobalt oxide precursor with coating structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a preparation method of a lithium cobalt oxide precursor with a coating structure, and the preparation method specifically includes the following steps:

[0069] (1) Co predoped with Mg, Ti and Al 3 o 4 and deionized water in a beaker with magnetic stirring, Co 3 o 4 The content of pre-doped Mg in the medium is 0.1wt%, the content of Ti is 0.5wt%, and the content of Al is 0.1wt%. After stirring for 3h, add zirconium nitrate aqueous solution drop by drop, every 100g of Co 3 o 4 Add 1.742g of zirconium nitrate, stir for 3h, add ammonia solution dropwise, then continue stirring for 3h to obtain the precursor mixture;

[0070] (2) After the precursor mixture was washed 3 times with deionized water, it was dried at 60°C to obtain a lithium cobalt oxide precursor coated with zirconium hydroxide;

[0071] (3) The lithium cobalt oxide precursor coated with zirconium hydroxide obtained in step (2) was sintered at 500 ° C for 10 h, crushed and ground...

Embodiment 2

[0076] This embodiment provides a preparation method of a lithium cobalt oxide precursor with a coating structure, and the preparation method specifically includes the following steps:

[0077] (1) Co(OH) pre-doped with Mn and Zn 2 and deionized water in a beaker with magnetic stirring, Co(OH) 2 The pre-doped Mn content in the medium is 0.1wt%, and the Zn content is 0.1wt%. After stirring for 3h, add magnesium nitrate aqueous solution drop by drop, every 100g of Co(OH) 2 Add 0.037g of magnesium nitrate, stir for 3h, add ammonia solution dropwise, then continue stirring for 3h to obtain the precursor mixture;

[0078] (2) After the precursor mixture was washed 3 times with deionized water, it was dried at 50°C to obtain a lithium cobaltate precursor coated with magnesium hydroxide on the surface;

[0079] (3) The lithium cobalt oxide precursor coated with magnesium hydroxide obtained in step (2) was sintered at 400 ° C for 12 hours, crushed and ground to obtain a lithium coba...

Embodiment 3

[0083] This embodiment provides a preparation method of a lithium cobalt oxide precursor with a coating structure, and the preparation method specifically includes the following steps:

[0084] (1) Magnetically stir CoO and deionized water pre-doped with Ni and Y in a beaker. The pre-doped Ni content in CoO is 5wt%, and the Y content is 3wt%. After stirring for 3 hours, add zinc nitrate dropwise Aqueous solution, adding 3.655g of zinc nitrate per 100g of CoO, stirring for 3h, adding ammonia solution dropwise, and then continuing to stir for 3h to obtain a precursor mixture;

[0085] (2) After the precursor mixture was washed 3 times with deionized water, it was dried at 55°C to obtain a lithium cobalt oxide precursor coated with zinc hydroxide on the surface;

[0086] (3) The lithium cobalt oxide precursor coated with zinc hydroxide obtained in step (2) was sintered at 450 ° C for 8 h, crushed and ground to obtain a lithium cobalt oxide precursor coated with zinc oxide on the ...

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Abstract

The invention provides a lithium cobalt oxide precursor with a coating structure and a preparation method and application thereof. The preparation method comprises the following steps: mixing and stirring a cobalt source doped with metal elements and a metal salt solution, adding alkali liquor, and continuously stirring to obtain a precursor mixture; and sintering the precursor mixture to obtain the lithium cobalt oxide precursor with the coating structure. According to the preparation method, the surface of the lithium cobalt oxide precursor is coated with the metal hydroxide by adopting a liquid-phase synthesis method so that the coating is more uniform, the coating layer can stably exist, and a stable solid solution coating interface is formed in the subsequent multiple sintering processes, and thus the material structure is more stable, and the electrochemical performance is better.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode material precursors, and relates to a lithium cobaltate precursor with a coating structure, its preparation method and application. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, long cycle life, light weight, less self-discharge, no memory effect, and high cost performance. They have been widely used in consumer electronics and new energy vehicles. Among them, the cathode material is one of the core parts of the lithium-ion battery, which determines the performance of the lithium-ion battery. The cathode material limits the energy density, power density, and cycle life of the lithium-ion battery. It can be said that the development of cathode materials determines the development direction of lithium-ion batteries. [0003] With the application of 5G mobile phones, the problem of low energy density of current consumer lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01G51/04C01G51/06C01G25/02C01F5/20C01F5/08C01G9/02C01G45/02C01F17/10C01F17/218C01F7/34C01F7/44H01M4/36H01M4/525H01M4/62H01M10/0525
CPCC01G51/42C01G51/04C01G51/06C01G25/02C01F5/20C01F5/08C01G9/02C01G45/02C01F17/10C01F17/218C01F7/34C01F7/441H01M4/366H01M4/525H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028C01P2004/80C01P2004/84Y02E60/10
Inventor 邱传洲洪斯凡朱红庆王理祝媛刘金成刘建华
Owner EVE ENERGY CO LTD
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