High-nickel ternary positive electrode material, and preparation method and application thereof

A cathode material, high nickel technology, applied in chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problem of not effectively reducing the amount of residual alkali on the surface of high nickel ternary cathode materials, and improve processing performance and safety performance problem, the effect of reducing the amount of residual alkali

Inactive Publication Date: 2020-02-14
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 existing production methods of high-nickel ternary positive electrode materials cannot effectively reduce the amount of residual alkali on the surface of high-nickel ternary positive electrode materials, and provide a method for reducing the residual alkali on the surface of high-nickel ternary positive electrode materials. method of alkalinity

Method used

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  • High-nickel ternary positive electrode material, and preparation method and application thereof

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Effect test

Embodiment 1

[0029] A method for preparing a high-nickel ternary positive electrode material, comprising the steps of:

[0030] (1) Add 811 ternary precursor and lithium hydroxide to a high-speed mixer and mix for 20 minutes according to the metal to lithium molar ratio of 1:1.045;

[0031] (2) Put the mixed materials into a sagger, put them into a primary sintering furnace, set the sintering temperature curve, and feed oxygen at the same time to carry out high-temperature sintering. The sintering temperature is 810°C, and the holding time is 14 hours;

[0032] (3) After the primary sintering is completed and the temperature is lowered, the material is crushed to obtain a primary sintered product, and the residual lithium is measured;

[0033] (4) Turn on the dehumidification and carbon dioxide removal equipment, and continuously pass the dehumidified and decarbonated air into the airtight drying room. The monitoring equipment in the drying room shows that the moisture content is 8.32ppm, ...

Embodiment 2

[0038] A method for preparing a high-nickel ternary positive electrode material, comprising the steps of:

[0039] (1) Add 811 ternary precursor and lithium hydroxide to a high-speed mixer and mix for 20 minutes according to the metal to lithium molar ratio of 1:1.045;

[0040] (2) Put the mixed materials into a sagger, put them into a primary sintering furnace, set the sintering temperature curve, and feed oxygen at the same time to carry out high-temperature sintering. The sintering temperature is 810°C, and the holding time is 14 hours;

[0041] (3) After the primary sintering is completed and the temperature is lowered, the material is crushed to obtain a primary sintered product, and the residual lithium is measured;

[0042] (4) Turn on the dehumidification and carbon dioxide removal equipment, and continue to pass the dehumidified and decarbonated air into the airtight drying room. The monitoring equipment in the drying room shows that the moisture content is 6.89ppm, t...

Embodiment 3

[0047] A method for preparing a high-nickel ternary positive electrode material, comprising the steps of:

[0048] (1) Add 811 ternary precursor and lithium hydroxide to a high-speed mixer and mix for 20 minutes according to the metal to lithium molar ratio of 1:1.045;

[0049] (2) Put the mixed materials into a sagger, put them into a primary sintering furnace, set the sintering temperature curve, and feed oxygen at the same time to carry out high-temperature sintering. The sintering temperature is 810°C, and the holding time is 14 hours;

[0050] (3) After the primary sintering is completed and the temperature is lowered, the material is crushed to obtain a primary sintered product, and the residual lithium is measured;

[0051] (4) Turn on the dehumidification and carbon dioxide removal equipment, and continue to pass the dehumidified and decarbonated air into the airtight drying room. The monitoring equipment in the drying room shows that the moisture content is 7.31ppm, t...

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Abstract

The invention discloses a high-nickel ternary positive electrode material, and a preparation method and application thereof. The preparation method of the high-nickel ternary positive electrode material comprises the steps of primary sintering, water washing, drying, coating, secondary sintering, sieving, demagnetizing and packaging, wherein water washing, drying, coating, sieving, demagnetizing and packaging are completed in a drying room, a moisture content of the drying room is smaller than or equal to 10 ppm, and a carbon dioxide content of the drying room is smaller than or equal to 10 ppm. The control of H2O and CO2 in the air is added in the production process, and the steps of water washing, drying, coating, sieving, demagnetizing and packaging are all completed in the drying room,so the contact between the produced high-nickel ternary positive electrode material and H2O and CO2 is avoided; and after residual lithium is reduced after the high-nickel ternary positive electrodematerial is washed with water, reaction with carbon dioxide rarely occurs, so the residual lithium is ensured not to increase, and thus, the content of residual alkali on the surface of the high-nickel ternary positive electrode material is reduced, the surface residual alkali content is kept to be less than or equal to 0.12%, the processability and safety of the material are improved, and the high-nickel ternary positive electrode material can be widely applied to preparation of electrode materials of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for batteries, and more particularly relates to a method for reducing the residual alkali on the surface of a high-nickel ternary positive electrode material and an application thereof. Background technique [0002] Due to the lower sintering temperature of high-nickel 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, which interact with H in the air. 2 O and CO 2 The reaction again produces LiOH and Li 2 CO 3 , remaining on the surface of the material to form residual alkali. 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 hexafluorophosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 黄华东张军李鹏飞黄宏威
Owner 乳源东阳光新能源材料有限公司
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