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Washing process and preparation method of a high-nickel polycrystalline ternary positive electrode material

A cathode material and high-nickel technology, which is applied in the washing process and preparation field of high-nickel polycrystalline ternary cathode materials, can solve problems such as loss of gram capacity, poor cycle performance, and large specific surface area, so as to improve processing performance and reduce Product sulfur content, effect of low specific surface area

Active Publication Date: 2021-10-01
乳源东阳光新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies that the washing process of the existing high-nickel polycrystalline ternary positive electrode material will cause loss of gram capacity, poor cycle performance, and large specific surface area, and provide a Washing process of high nickel polycrystalline ternary cathode material

Method used

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  • Washing process and preparation method of a high-nickel polycrystalline ternary positive electrode material

Examples

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Effect test

Embodiment 8

[0044] The following examples take the preparation of the 8-series nickel-rich polycrystalline ternary cathode material as an example.

[0045] The assay method of residual lithium content of the present invention is as follows:

[0046] Sample pretreatment process: Take about 10g of the ternary material sample and place it in a 250mL conical flask with a stopper, weigh it accurately, add a large magnetic stirrer in the bottle, and accurately weigh 90g of boiled distilled water in the conical flask with a stopper. Then open the rubber stopper, use N 2 Carry out gas replacement in the bottle, purging time is about 5 minutes, place the conical flask with stopper on a magnetic stirrer at room temperature and high speed and stir for 30 minutes, then let the conical flask with stopper stand for 5 minutes, and use a needle filter for rapid filtration in In a 100mL PET bottle, shake evenly and cap tightly for testing.

[0047] Titration: The first step is to accurately weigh 10g of...

Embodiment 1

[0062] A washing process for a high-nickel polycrystalline ternary positive electrode material, comprising the following steps: homogenizing the high-nickel polycrystalline ternary positive electrode material sintered for the first time with ethanol, beating and washing, and adding an ionic liquid at the same time, wherein the high-nickel polycrystalline ternary The mass ratio of positive electrode material to ethanol is 1:1, the amount of ionic liquid added is 2% of the mass of high-nickel polycrystalline ternary positive electrode material, the washing time is 40min, and the amount of grain boundary filler added is the mass of high-nickel polycrystalline ternary positive electrode material 0.1% of.

[0063] A method for preparing a high-nickel polycrystalline ternary positive electrode material, comprising the steps of:

[0064] S1. 100.00kg of nickel cobalt manganese hydroxide Ni 0.88 co 0.06 MN 0.06 (OH) 2 Put 47.64 kg of lithium hydroxide monohydrate into a high-mixer...

Embodiment 2

[0069] The difference between the washing process of the high-nickel polycrystalline ternary positive electrode material of this embodiment and Example 1 is that the mass ratio of the high-nickel polycrystalline ternary positive electrode material to ethanol is 1:0.5, and the amount of ionic liquid added is high nickel polycrystalline ternary positive electrode material. 0.5% of the mass of the cathode material.

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Abstract

The invention provides a washing process and preparation method of a high-nickel polycrystalline ternary positive electrode material. The washing process is to homogenize the primary sintered material with ethanol and then perform beating and washing, and at the same time add ionic liquid and grain boundary filler. The washing process of the present invention uses ethanol-ionic liquid-grain boundary filler to replace the traditional washing process, which reduces the amount of residual lithium on the surface of the high-nickel polycrystalline ternary positive electrode material and the sulfur content of the product, maintains the low specific surface area of ​​the ternary material, and improves It improves the processing performance, safety performance and cycle performance of the material, and does not affect the capacity of the material; and compared with the traditional aqueous solution system, it does not need to consume a large amount of aqueous solution, and the ionic liquid-ethanol-grain boundary filler system solution after washing It can be purified by reverse osmosis, extraction and other methods, and reused. The washing cost is low and there is no need to carry out environmental protection treatment and discharge of a large amount of aqueous solution, which reduces production costs and environmental protection pressure.

Description

technical field [0001] The invention relates to the technical field of surface treatment of positive electrode materials for lithium-ion batteries, and more specifically, to a washing process and preparation method of high-nickel polycrystalline ternary positive electrode materials. Background technique [0002] Due to the lower sintering temperature of high-nickel polycrystalline ternary cathode materials, the volatilization of lithium salts is low, and the excess lithium salts exist on the surface and inside of the material in the form of Li oxides. 2 O and CO 2 The reaction again generates LiOH, Li 2 CO 3 , remaining on the surface of the material (residual lithium). The higher the nickel content, the greater the amount of residual lithium on the surface of the material. During the homogenization and coating process of battery production, the slurry is very easy to absorb water and form a jelly shape. LiOH reacts with lithium hexafluorophosphate in the electrolyte to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 温益凡张军程正余英凤
Owner 乳源东阳光新能源材料有限公司
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