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Positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and lithium source technology, applied in the field of lithium ion batteries, positive electrode materials and their preparation, can solve the problems of residual alkali on the surface of ternary positive electrode materials, battery capacity attenuation, etc., to improve cycle stability and service life, and reduce Formation, good effect of biocompatibility

Active Publication Date: 2021-11-05
贝特瑞(江苏)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ternary cathode material has attracted much attention due to its high specific capacity and energy density, but there are still defects in practical applications. Due to the serious problem of residual alkali on the surface of the ternary cathode material, the gas swelling phenomenon is obvious during the long cycle process, resulting in battery capacity fading

Method used

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0081] The application also provides a preparation method of positive electrode material, such as Figure 4 As shown, the method includes the following steps S100-S200:

[0082] Step S100, the Ni x co y m z Oxide or Ni x co y m z The hydroxide and the lithium source are mixed to obtain a mixture, and the mixture is sintered to obtain an active material, wherein, 0.8≤x<1, 0<y+z≤0.2, M is selected from Mn, Al, Cu, Zn, Cr at least one of

[0083] Step S200, adding the covalent-organic framework material and the active substance into the solvent to obtain a mixed solution, and adding a metal salt to the mixed solution for mixing, then adding 2-methylimidazole for washing and stirring, filtering, drying, and sieving , to obtain the positive electrode material.

[0084] In the preparation method provided by this application, the active material obtained by sintering is added to the solvent together with the covalent-organic framework material (COFs), so that the COFs materia...

Embodiment 1

[0115] A method for preparing a positive electrode material, comprising the steps of:

[0116] (1) The nickel-cobalt-manganese precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 After mixing with LiOH at a molar ratio of 1:1.05, dry grinding at 25°C for 1 hour to obtain a mixture;

[0117] (2) Place the mixture in a muffle furnace for pre-sintering at 450°C for 5 hours, grind it to fine particles and transfer it to a tube furnace for high-temperature sintering in an oxygen atmosphere for 15 hours. The sintering temperature is controlled at 750°C, and the active material obtained by sintering is ground to The average particle size is 15μm;

[0118] (3) Prepare a reactor device that can be stirred and heated, add 0.3g of covalent organic framework material (COF-1) and 10g of active material into 200ml of deionized water while stirring, heat and react for 30min, and then pour it into the reactor Add 0.15g of zinc acetate dihydrate and 0.05g of cobalt acetate tetrahydrate, stir well, then...

Embodiment 2

[0122] A method for preparing a positive electrode material, comprising the steps of:

[0123] (1) The nickel-cobalt-manganese precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 After mixing with LiOH at a molar ratio of 1:1.03, dry grinding at 30°C for 1.5 hours to obtain a mixture;

[0124] (2) Place the mixture in a muffle furnace for pre-sintering at 470°C for 5 hours, grind it to fine particles and transfer it to a tube furnace for high-temperature sintering in an oxygen atmosphere for 13 hours. The sintering temperature is controlled at 720°C, and the active material obtained by sintering is ground to The average particle size is 13μm;

[0125] (3) Prepare a stirring and heating reactor device, add 0.4g of covalent organic framework material (COF-102) and 10g of active material into 400ml of deionized water while stirring, heat and react for 30min, and then pour into the reactor Add 0.13g of zinc acetate dihydrate and 0.05g of cobalt acetate tetrahydrate, stir well, then slowly ...

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Abstract

The invention relates to the field of positive electrode materials, and provides a positive electrode material and a preparation method thereof, and a lithium ion battery. The positive electrode material comprises an active substance, wherein the chemical general formula of the active substance is LiaNixCoyMzO2, a is greater than or equal to 0.95 and less than or equal to 1.05, x is greater than or equal to 0.8 and less than 1, y + z is greater than 0 and less than or equal to 0.2, and M is selected from at least one of Mn, Al, Cu, Zn and Cr; and a coating layer formed on at least part of the surface of the active substance, wherein the coating layer comprises a covalent-organic framework material and a metal-organic framework material grown on the surface of the covalent-organic framework material. According to the positive electrode material, the preparation method thereof and the lithium ion battery, the structural stability of the material can be improved, and the cycling stability of the lithium ion battery can be improved.

Description

technical field [0001] The present application relates to the technical field of cathode materials, in particular, to cathode materials, preparation methods thereof, and lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. [0003] The ternary cathode material has attracted much attention due to its high specific capacity and energy density, but there are still defects in practical applications. Due to the serious problem of residual alkali on the surface of the ternary cathode material, the gas swelling phenomenon is obvious during the long cycle process, resulting in The capacity of the battery fades. Therefore, how to improve the cycle stability of ternary cathode materials is an urgent problem to be solved. Contents of the invention [0004] In view of this, the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525H01M10/52C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/628H01M10/0525H01M10/52C01G53/50C01G53/42H01M2004/021H01M2004/028Y02E60/10
Inventor 张韦宋雄任付金吴小珍杨顺毅黄友元
Owner 贝特瑞(江苏)新材料科技有限公司
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