A kind of preparation method of dry method and wet method carbon-coated high nickel ternary positive electrode material

A positive electrode material and carbon coating technology, which is applied in the field of preparation of dry and wet carbon coated high-nickel ternary positive electrode materials, to achieve the effects of improving Coulombic efficiency, less waste of raw materials, and improving conductivity

Active Publication Date: 2022-06-03
福建金山锂科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to overcome the shortcomings of existing high-nickel ternary materials during use, and to improve the surface characteristics of high-nickel ternary positive electrode materials by adopting nano-carbon coating technology

Method used

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  • A kind of preparation method of dry method and wet method carbon-coated high nickel ternary positive electrode material
  • A kind of preparation method of dry method and wet method carbon-coated high nickel ternary positive electrode material
  • A kind of preparation method of dry method and wet method carbon-coated high nickel ternary positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0031] The sintered high-nickel ternary cathode material NCM811 (nickel content greater than or equal to 47 wt.%) was pulverized, classified, and then the particle size D50 was 5-30nm in the coating agent conductive carbon black and graphene oxide mixture (graphene oxide accounted for 3% of the total amount of the mixture) is dispersed in a water solvent, the ternary positive electrode material is added to the aqueous solution containing the coating agent and mixed, fully stirred, the stirring speed is 20 rpm, and then the mixed slurry is heated at 80 °C in a vacuum for 8 hours, and the The water content is evaporated to dryness, and the mixed and dried materials are fused with a high-speed fusion machine. The fusion machine rotates at 800 rpm and the fusion time is 15 minutes. Then, the finished product is obtained after sieving, batch mixing, and demagnetization.

Embodiment 2

[0033] The sintered high-nickel ternary cathode material NCM811 (nickel content greater than or equal to 47 wt.%) was pulverized, classified, and then the particle size D50 was 5-30nm in the coating agent conductive carbon black and graphene oxide mixture (graphene oxide accounted for 3% of the total amount of the mixture) was dispersed in a water solvent, the ternary positive electrode material was added to the aqueous solution containing the coating agent and mixed, fully stirred, and the stirring speed was 40 rpm, and then the mixed slurry was heated at 150 °C in a vacuum for 2 hours. The water content is evaporated to dryness, and the mixed and dried materials are fused with a high-speed fusion machine. The fusion machine rotates at 1500 rpm and the fusion time is 8 minutes. Then, the finished product is obtained after sieving, batch mixing, and demagnetization.

Embodiment 3

[0035] The sintered high-nickel ternary cathode material NCM811 (nickel content greater than or equal to 47 wt.%) was pulverized, classified, and then the particle size D50 was 5-30nm in the coating agent conductive carbon black and graphene oxide mixture (graphene oxide accounted for 3% of the total amount of the mixture) was dispersed in a water solvent, the ternary positive electrode material was added to the aqueous solution containing the coating agent and mixed, fully stirred, and the stirring speed was 30 rpm, and then the mixed slurry was heated at 120 °C in a vacuum for 5 hours. The water content is evaporated to dryness, and the mixed and dried materials are fused with a high-speed fusion machine. The fusion machine rotates at 1200 rpm and the fusion time is 12 minutes. Then, the finished product is obtained after sieving, batch mixing, and demagnetization.

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Abstract

The present invention provides a method for preparing a carbon-coated high-nickel ternary positive electrode material by a dry process and a wet process, comprising the following steps: step (1): pulverizing and grading the sintered high-nickel ternary positive electrode material; step (2) : Dispersing the coating agent nano-carbon in the water solvent; step (3): mixing the ternary positive electrode material and the nano-carbon coating agent, and fully stirring; step (4): heating the mixed slurry in vacuum, and evaporating the contained water Drying; Step (5): The mixed and dried materials are fused with a high-speed fusion machine, and then sieved, batch mixed, and demagnetized to obtain the finished product. The invention adopts a wet coating process to prepare a carbon-coated high-nickel ternary positive electrode material. Compared with the traditional aluminum-coated high-nickel ternary positive electrode material, the nano-carbon-coated material has better conductivity and better rate performance. .

Description

technical field [0001] The invention belongs to the fields of energy storage materials and electrochemistry, and relates to a preparation method of a dry-process and wet-process carbon-coated high-nickel ternary positive electrode material. Background technique [0002] As an important energy storage tool in modern society, lithium-ion batteries with high energy density not only realize the miniaturization and portability of electronic products, but also show broad prospects in power batteries and energy storage systems. The electrochemical performance of the battery mainly depends on the positive electrode material. At present, the specific energy of the high-nickel ternary material battery in mass production has reached 220Wh / kg, and the high-nickel ternary material battery with the specific energy close to 300Wh / kg will be mass-produced. However, there are still many problems to be solved in the actual charging and discharging and actual industrial production of high-nick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/38H01M4/625Y02E60/10
Inventor 张保平于伟
Owner 福建金山锂科新材料有限公司
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