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Doping and coating method, method for modifying ternary positive electrode material by adopting same and application

A positive electrode material and coating technology, which is applied in the field of material preparation and modification, can solve the problems of high temperature of doping and coating, defects of uniformity and adhesion of coating, and weakening of doping and coating effect.

Active Publication Date: 2021-11-05
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The commonality of the doping and cladding by the above-mentioned processes is that metal or non-metallic oxides, hydroxides and other raw materials are used, and the doping and cladding Most of these compounds of metal elements have high melting points, so that the temperature of doping and coating is high, and there will be certain defects in the uniformity of doping and the firmness of coating adhesion, which will weaken the final doping and coating effect.

Method used

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  • Doping and coating method, method for modifying ternary positive electrode material by adopting same and application
  • Doping and coating method, method for modifying ternary positive electrode material by adopting same and application

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Embodiment 1

[0064] This embodiment provides a modified ternary positive electrode material, the modified ternary positive electrode material includes an Al-doped nickel-cobalt-manganese inner core, and a cladding layer coated on the surface of the inner core, in the cladding layer Contains the coating element Al.

[0065] This embodiment also provides a method for preparing the above-mentioned modified ternary positive electrode material, comprising the following steps:

[0066] ① Premixing: Premixing is carried out according to the weight ratio of additive and co-solvent 1:2, and premixing is carried out in a high-speed mixer for 10 minutes.

[0067] In this embodiment, the additive is aluminum oxide, and the cosolvent is a mixture of sodium hydroxide, lithium carbonate, and potassium chloride in a molar ratio of 1:1:1. Mixing molten salt can optimize the melting temperature, reduce the content of impurity elements, and optimize the cost structure of molten salt.

[0068] ②Pre-sinterin...

Embodiment 2

[0074] This embodiment provides a modified ternary positive electrode material, the modified ternary positive electrode material includes a Ti-doped nickel-cobalt-manganese inner core, and a coating layer coated on the surface of the inner core, in the coating layer Contains the covering element Ti.

[0075] This embodiment also provides a method for preparing the above-mentioned modified ternary positive electrode material, comprising the following steps:

[0076] ① Premixing: Premixing is carried out according to the weight ratio of additive and co-solvent 1:5, and premixing is carried out in a high-speed mixer for 10 minutes.

[0077] In this embodiment, the additive is titanium dioxide, and the cosolvent is a mixture of sodium chloride, lithium hydroxide, and potassium fluoride in a molar ratio of 2:1:0.2. Mixing molten salt can optimize the melting temperature, reduce the content of impurity elements, and optimize the cost structure of molten salt.

[0078] ②Pre-sinteri...

Embodiment 3

[0084] This embodiment provides a modified ternary positive electrode material, the modified ternary positive electrode material includes an NCM811 core, and a cladding layer coated on the surface of the NCM811 core, and the cladding layer contains the cladding element Ti , Al and P.

[0085] This embodiment also provides a method for preparing the above-mentioned modified ternary positive electrode material, comprising the following steps:

[0086] ① Pre-mixing: Pre-mixing is carried out according to the weight ratio of additives and co-solvents of 1:10, and pre-mixing is carried out in a high-speed mixer for 10 minutes.

[0087] In this embodiment, the additive is titanium dioxide, aluminum oxide, ammonium dihydrogen phosphate (molar ratio 1.7:0.15:3.0), and the cosolvent is sodium chloride, lithium hydroxide, and potassium bromide according to the molar ratio of 1:2:0.1. mixture. Mixing molten salt can optimize the melting temperature, reduce the content of impurity element...

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Abstract

The invention discloses a doping and coating method, a method for modifying a ternary positive electrode material by adopting the method and an application. The doping and coating method comprises the following steps: 1) mixing a doping and coating additive and a cosolvent, pre-sintering, washing and drying to obtain a low-melting-point additive; and 2) adopting the low-melting-point additive, and performing doping treatment and / or coating treatment on a to-be-modified material by using a sintering method. According to the method, the sintering temperature and time of doping and coating can be properly reduced, the uniformity of doping and the firmness of coating combination can be properly improved, the process requirements can be reduced, and the method has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of material preparation and modification, and relates to a doping coating method, a method for modifying a ternary positive electrode material using the method and an application thereof. Background technique [0002] Nickel-cobalt-manganese ternary cathode materials have always occupied an important position in new energy lithium battery materials. With the continuous research and development of such materials, proper doping and coating can improve the safety, cycle, rate and other properties of materials. Certain improvements have been made so that the overall electrochemical performance of the material can be more fully utilized. Nowadays, doping and coating have become an indispensable step in the preparation of ternary cathode materials, especially high-quality ternary materials of high-nickel systems. [0003] There are many reported methods for doping and coating, and they have also played a good role...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/40H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/021H01M2004/028C01P2004/03C01P2004/61Y02E60/10H01M4/1391H01M4/131C01G53/44C01P2002/52
Inventor 万江涛张宁张勇杰刘满库刘海松江卫军
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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