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Low-residual-alkali high-nickel ternary positive electrode material and preparation method and application thereof

A positive electrode material and residual alkali technology, which is applied in the field of low residual alkali and high nickel ternary positive electrode materials, can solve the problems of lithium deficiency on the surface of the material, complicated washing process, and increased production costs, so as to ensure electrical performance and simple and easy process , The effect of low residual alkali value

Active Publication Date: 2022-05-24
宜宾锂宝新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) In the mixed lithium sintering stage, reduce the proportion of lithium salt and adjust the sintering system so that lithium can quickly diffuse into the crystal, but reducing the lithium ratio will lead to a decrease in capacity
[0005] (2) Wash the material with water, and then sinter the surface to reduce the residual alkali content on the surface, but correspondingly, it will lose some electrical properties. This is a method commonly used in business at present, but this will cause lithium deficiency on the surface of the material, and a corresponding part will be lost. Electrical performance; at the same time, the washing process is complicated, which will cause a certain amount of loss and increase the production cost

Method used

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  • Low-residual-alkali high-nickel ternary positive electrode material and preparation method and application thereof

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preparation example Construction

[0032] An embodiment of the present invention provides a method for preparing a low residual alkali and high nickel ternary positive electrode material, comprising the following steps:

[0033] S1, pre-sintering

[0034] The nickel-containing precursor and lithium salt are pre-sintered to obtain a pre-sintered material, and the pre-sintering is performed under the condition of a slight negative pressure of -15~-2Pa, and the pre-sintering temperature is 450~550°C. In the pre-sintering process, the control method of micro-negative pressure in the furnace can be used to fully discharge the water of the lithium salt and the carbon dioxide generated by the preliminary reaction of the precursor and the lithium salt.

[0035] Specifically, the pressure of the slight negative pressure can be -15Pa, -14Pa, -13Pa, -12Pa, -11Pa, -10Pa, -9Pa, -8Pa, -7Pa, -6Pa, -5Pa, -4Pa, -3Pa, - 2Pa, etc., can also be any value between the above adjacent pressure values.

[0036] Specifically, the pre-...

Embodiment 1

[0058] The present embodiment provides a method for preparing a low residual alkali and high nickel ternary positive electrode material, comprising the following steps:

[0059] (1) Pre-sintering: Weigh Ni 0.8 Co 0.1 Mn 0.1 (OH) 2 The precursor and lithium salt, the lithium ratio is 1.05, the raw materials are mixed and then placed in the roller kiln atmosphere for pre-sintering. Slight negative pressure -8Pa, after the pre-sintering is completed, the pre-sintered material is obtained.

[0060] (2) One-time high-temperature sintering: crush the pre-sintered material, add the dopant ZrO 2 and Al 2 O 3 Mixing, the addition amount of Zr is controlled to be 2000 ppm, and the addition amount of Al is 1000 ppm. The mixed material was sintered in the roller kiln atmosphere, heated to 780°C at a heating rate of 3°C / min, sintered for 10 hours, and the oxygen concentration in the sintering atmosphere was >95%; After 5 hours of sintering, micro-positive pressure 3Pa sintering was...

Embodiment 2

[0063] This embodiment provides a preparation method of a low residual alkali and high nickel ternary positive electrode material. The difference from Embodiment 1 lies in the pressure control in the process. Except for the following parameters, the others are the same as those in Embodiment 1, and the details are as follows:

[0064] (1) Pre-sintering: The sintering pressure is slightly negative pressure -12Pa.

[0065] (2) One-time high-temperature sintering: sintering at a slight negative pressure -8Pa first, and then sintering at a slight positive pressure at 1Pa after sintering for 5 hours to obtain semi-finished products of ternary materials.

[0066] (3) Secondary high temperature sintering: control the micro-positive pressure to 1Pa.

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Abstract

The invention discloses a low-residual-alkali high-nickel ternary positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium batteries. The preparation method of the low-residual-alkali high-nickel ternary positive electrode material comprises the following steps: pre-sintering a nickel-containing precursor and a lithium salt to obtain a pre-sintered material, and carrying out primary high-temperature sintering on the pre-sintered material and a doping agent; presintering is carried out under the condition of micro negative pressure, so that water of the lithium salt and carbon dioxide generated by primary reaction of the precursor and the lithium salt can be fully discharged; during primary high-temperature sintering, sintering is firstly controlled under the condition of micro negative pressure, a large amount of water and carbon dioxide generated by reaction are discharged, and then micro positive pressure sintering is adopted, so that the reaction is fully carried out, and a ternary material semi-finished product with a complete structure is obtained. The residual alkali value in the prepared product is very low, the electrical property of the material is ensured, and the process is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular, to a low residual alkali and high nickel ternary positive electrode material, a preparation method and application thereof. Background technique [0002] As we all know, with the increase of nickel content in ternary materials, the content of residual alkali after sintering is also getting higher and higher, which is also one of the most important reasons that high-nickel materials have been unable to be industrialized. High residual alkali content will result in high requirements for production environment and process control ability, and it is very easy to cause jelly after the slurry absorbs water, which is difficult in practical application. Therefore, reducing the surface residual alkali content is of great significance for the application of ternary materials in batteries. [0003] At present, the means to reduce the excessive alkalinity of the surface of high-nick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B35/10H01M4/505H01M4/525H01M10/0525
CPCC01G53/44C01B35/10H01M4/525H01M4/505H01M10/0525H01M2004/028C01P2004/80C01P2006/40Y02E60/10C01G53/50H01M4/0471H01M4/1391H01M4/366H01M2004/021C01P2002/52
Inventor 张彬范未峰程正朱淇才樊浩杰王政强
Owner 宜宾锂宝新材料有限公司