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A preparation method of a polydopamine ion-electronic conductive network-coated lithium-ion battery positive electrode material

A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparation of polydopamine-based ionic and electronically conductive network-coated lithium-ion battery cathode materials, can solve problems such as unfavorable mass production and complicated operation, and achieve improved charge-discharge cycle stability , Reduce operation steps and save time

Active Publication Date: 2022-06-03
河南电池研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of dopamine polymerization in weak alkaline, the coating process often requires adding alkali to adjust the pH value or preparing a buffer solution in a weak alkaline environment, which is not only complicated to operate, but also not conducive to mass production.

Method used

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  • A preparation method of a polydopamine ion-electronic conductive network-coated lithium-ion battery positive electrode material
  • A preparation method of a polydopamine ion-electronic conductive network-coated lithium-ion battery positive electrode material
  • A preparation method of a polydopamine ion-electronic conductive network-coated lithium-ion battery positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0019] Add 1.5g of dopamine to 48.5g of N-methylpyrrolidone, stir and mix evenly to obtain a dopamine N-methylpyrrolidone solution with a mass fraction of 3%, and then add 50mL of dopamine's N-methylpyrrolidone solution and 8g of NCM622 ternary The positive electrode material, 1 g of the binder PVDF and 1 g of the conductive agent sp are fully stirred and mixed in a ball mill to obtain a positive electrode slurry, and then the positive electrode slurry is coated on the positive electrode current collector and dried to obtain a polydopamine-based ionic electronic conductive network coating. The positive electrode material of lithium ion battery is cut into a 14mm diameter disk as the positive electrode, the lithium sheet is used as the negative electrode, and the separator, electrolyte, shrapnel and gasket are added to prepare a half battery for charge and discharge test.

Embodiment 2

[0021] Add 0.5g of dopamine to 49.5g of N-methylpyrrolidone, stir and mix evenly to obtain a dopamine N-methylpyrrolidone solution with a mass fraction of 1%, and then add 50mL of dopamine's N-methylpyrrolidone solution and 8g of NCM333 ternary The positive electrode material, 1 g of the binder PVDF and 1 g of the conductive agent sp are fully stirred and mixed in a ball mill to obtain a positive electrode slurry, and then the positive electrode slurry is coated on the positive electrode current collector and dried to obtain a polydopamine-based ionic electronic conductive network coating. The positive electrode material of lithium ion battery is cut into a 14mm diameter disk as the positive electrode, the lithium sheet is used as the negative electrode, and the separator, electrolyte, shrapnel and gasket are added to prepare a half battery for charge and discharge test.

Embodiment 3

[0023] Add 1 g of dopamine to 49 g of N-methylpyrrolidone and stir and mix evenly to obtain a dopamine N-methylpyrrolidone solution with a mass fraction of 2%, then add 50 mL of dopamine to the N-methylpyrrolidone solution and 8g of NCM523 ternary positive electrode material. , 1g of binder PVDF and 1g of conductive agent sp are fully stirred and mixed in a ball mill to obtain a positive electrode slurry, and then the positive electrode slurry is coated on the positive electrode current collector and dried to obtain a polydopamine ion electronic conductive network coated lithium ion The positive electrode material of the battery is cut into a circle with a diameter of 14 mm as the positive electrode, and the lithium sheet is used as the negative electrode, and the separator, electrolyte, shrapnel and gasket are added to prepare a half battery for charge and discharge test.

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Abstract

The invention discloses a preparation method of a polydopamine ion-electronic conductive network-coated lithium-ion battery positive electrode material. The specific process is: adding dopamine into N-methylpyrrolidone and stirring and mixing uniformly to obtain dopamine-based N-methylpyrrolidone solution, and then the N-methylpyrrolidone solution of dopamine is fully stirred and mixed with the ternary positive electrode material, binder and conductive agent to obtain a positive electrode slurry, and then the positive electrode slurry is coated on the positive electrode current collector and dried to obtain a poly A dopamine-based ionic and electronically conductive network coated lithium-ion battery cathode material. In the present invention, dopamine, which is easy to polymerize under alkaline conditions, is used as a polymerized monomer, and by pre-adding it to NMP, the uniform coating of the dopamine polymer conductive network on the ternary positive electrode material is realized only in the process of brushing. It not only reduces the operation steps, but also saves time, and lays a solid foundation for mass production in the future.

Description

technical field [0001] The invention belongs to the technical field of preparation of ternary positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing a positive electrode material of lithium ion batteries covered by polydopamine ion electronic conductive network. Background technique [0002] Lithium-ion battery ternary cathode materials, represented by nickel-cobalt manganate lithium, have made great progress since 1992, and have surpassed their parent LiCoO. 2 Significant improvement in physical and chemical properties. However, due to its own layered structure, the diffusion channel of lithium ions is a two-dimensional channel. Although it is stronger than the one-dimensional channel of lithium iron phosphate, it cannot meet the needs of high-current charge and discharge of power batteries. At the same time, the ternary cathode material continuously extracts and intercalates lithium ions with the electrolyte during the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525H01M10/42
CPCH01M4/362H01M4/628H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 杨书廷王科王明阳王志超李向南
Owner 河南电池研究院有限公司
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