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Preparation methods for dry-process and wet-process carbon-coated high-nickel ternary positive electrode materials

A cathode material and carbon coating technology, which is applied in the field of dry and wet carbon-coated high-nickel ternary cathode materials to achieve the effects of alleviating energy crisis, low energy consumption, and reducing surface pH

Active Publication Date: 2019-02-26
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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  • Preparation methods for dry-process and wet-process carbon-coated high-nickel ternary positive electrode materials
  • Preparation methods for dry-process and wet-process carbon-coated high-nickel ternary positive electrode materials
  • Preparation methods for dry-process and wet-process carbon-coated high-nickel ternary positive electrode materials

Examples

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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 crushed and classified, and then the particle size D50 was 5-30nm 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 cathode material is added to the aqueous solution containing the coating agent and mixed, fully stirred at a stirring speed of 20 rpm, and then the mixed slurry is heated at 80°C for 8 hours in a vacuum, and the The contained water is evaporated to dryness, and the mixed and dried materials are fused with a high-speed fusion machine. The speed of the fusion machine is 800 rpm, and the fusion time is 15 minutes. Then, the finished product is obtained after screening, 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 crushed and classified, and then the particle size D50 was 5-30nm 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 cathode material is added to the aqueous solution containing the coating agent and mixed, fully stirred at a stirring speed of 40 rpm, and then the mixed slurry is heated at 150°C for 2 hours in a vacuum. The contained water is evaporated to dryness, and the mixed and dried materials are fused with a high-speed fusion machine. The speed of the fusion machine is 1500 rpm, and the fusion time is 8 minutes. After screening, batch mixing, and demagnetization, the finished product is obtained.

Embodiment 3

[0035] The sintered high-nickel ternary cathode material NCM811 (nickel content greater than or equal to 47 wt.%) was crushed and classified, and then the particle size D50 was 5-30nm 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 at a stirring speed of 30 rpm, and then the mixed slurry is heated at 120°C for 5 hours in a vacuum, and the The contained water is evaporated to dryness, and the mixed and dried materials are fused with a high-speed fusion machine. The speed of the fusion machine is 1200 rpm, and the fusion time is 12 minutes. After screening, batch mixing, and demagnetization, the finished product is obtained.

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Abstract

The invention provides preparation methods for dry-process and wet-process carbon-coated high-nickel ternary positive electrode materials. The preparation method for a wet-process carbon-coated high-nickel ternary positive electrode material comprises the following steps: step (1) pulverizing and grading a sintered high-nickel ternary positive electrode material; step (2) dispersing a coating agent, i.e., nanocarbon, in an aqueous solvent; step (3) mixing the ternary positive electrode material with the nanocarbon coating agent under sufficient stirring; step (4) heating mixed slurry obtainedin the previous step under vacuum to evaporate all the water therein; and step (5) subjecting the mixed and dried materials to fusion treatment by a high-speed fusion machine, and then successively performing sieving, batch-mixing and demagnetization to obtain a finished product. According to the invention, a wet coating process is adopted for preparation of the carbon-coated high-nickel ternary positive electrode material; and compared with conventional aluminum-coated high-nickel ternary positive electrode materials, the nanocarbon-coated material has better conductivity and rate performance.

Description

technical field [0001] The invention belongs to the field of energy storage materials and electrochemistry, and relates to a method for preparing a carbon-coated high-nickel ternary positive electrode material by a dry method and a wet method. 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 cathode material. The specific energy of the mass-produced high-nickel ternary material battery has reached 220Wh / kg, and the high-nickel ternary material battery with a specific energy close to 300Wh / kg will soon be mass-produced. However, there are still many problems to be solved in the actual charging and discharging and actual industrial production of high-nickel ternary materials. ...

Claims

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Application Information

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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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