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Preparation method and application of layered two-dimensional material coated nickel-cobalt-manganese ternary positive electrode material

A cathode material and two-dimensional material technology, which is applied in the field of preparation of a layered two-dimensional material-coated nickel-cobalt-manganese ternary cathode material, can solve the problems of affecting the cycle performance of the material, reducing the content of electrode active substances, destroying the material structure, and the like. Achieve good chemical stability, excellent electrical conductivity, good hydrophilicity

Active Publication Date: 2021-12-03
河南海宏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte contains a very small amount of HF, which can react with active substances, reduce the content of active substances in the electrode, destroy the material structure, and seriously affect the cycle performance of the material

Method used

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  • Preparation method and application of layered two-dimensional material coated nickel-cobalt-manganese ternary positive electrode material
  • Preparation method and application of layered two-dimensional material coated nickel-cobalt-manganese ternary positive electrode material
  • Preparation method and application of layered two-dimensional material coated nickel-cobalt-manganese ternary positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Preparation of coating liquid MXene: Ti 3 AlC 2 (2g) and LiF (3g) were dispersed in 40mL of 9M hydrochloric acid solution; stirred at a constant temperature in a polytetrafluoroethylene container for 48h, centrifuged, washed with water to remove impurities until the pH was neutral, and dried to obtain a centrifugal precipitate; disperse the centrifugal precipitate In 500mL of deionized water, sonicate for 2 hours to separate the MXene sheets, and obtain the MXene dispersion liquid with oxygen-containing functional groups on the surface, that is, the MXene coating liquid with negative charge on the surface of the material, showing negative charge.

[0023] Cationic coating of nickel-cobalt-manganese ternary positive electrode material: Weigh 0.5g cationic surfactant PAH (polypropylene ammonium chloride) and dissolve it in 50mL deionized water, stir for 30min to obtain surfactant coating solution; then slowly add 0.5g Nickel-cobalt-manganese ternary positive electrode ma...

Embodiment 2

[0028] Preparation of coating liquid MXene: Ti 3 AlC 2 (2g) and LiF (3g) were dispersed in 40mL of 9M hydrochloric acid solution; stirred at a constant temperature in a polytetrafluoroethylene container for 48h, centrifuged, washed with water to remove impurities until the pH was neutral, and dried to obtain a centrifugal precipitate; disperse the centrifugal precipitate In 500mL of deionized water, sonicate for 2 hours to separate the MXene sheets, and obtain the MXene dispersion liquid with oxygen-containing functional groups on the surface, that is, the MXene coating liquid with negative charge on the surface of the material, showing negative charge.

[0029] Cationic coating of nickel-cobalt-manganese ternary positive electrode material: Weigh 0.5g cationic surfactant PAH (polypropylene ammonium chloride) and dissolve it in 50mL deionized water, stir for 30min to obtain surfactant coating solution; then slowly add 0.5g Nickel-cobalt-manganese ternary positive electrode ma...

Embodiment 3

[0037] Preparation of coating liquid MXene: Ti 3 AlC 2 (3g) and LiF (3g) were dispersed in 40mL of 9M hydrochloric acid solution; stirred at a constant temperature in a polytetrafluoroethylene container for 40h, centrifuged, washed with water to remove impurities until the pH was neutral, and dried to obtain a centrifugal precipitate; disperse the centrifugal precipitate In 500mL of absolute ethanol, sonicate for 1h to separate the MXene sheets, and obtain the MXene dispersion liquid with oxygen-containing functional groups on the surface, that is, the MXene coating liquid with negative charge on the surface of the material, showing negative charge.

[0038] Cationic coating of nickel-cobalt-manganese ternary positive electrode material: Weigh 0.5g cationic surfactant polydiallyldimethylammonium chloride and dissolve it in 50mL deionized water, stir for 30min to obtain surfactant coating solution; then slowly Add 0.5 g of nickel-cobalt-manganese ternary positive electrode mat...

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Abstract

The invention belongs to the technical field of battery positive electrode materials, and particularly relates to a preparation method and application of a layered two-dimensional material coated nickel-cobalt-manganese ternary positive electrode material. The nickel-cobalt-manganese ternary positive electrode material is coated by a Ag particle-containing MXenes nanosheet material through an electrostatic adsorption process, so that the contact area between the positive electrode material and an electrolyte is effectively reduced, the side reaction caused by direct contact between the positive electrode material and the electrolyte is reduced, and the electrochemical stability of the nickel-cobalt-manganese ternary positive electrode material is improved. Meanwhile, the preparation method is simple, the process is short, the steps are easy to operate, and the material is excellent in processability and electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of battery positive electrode materials, and in particular relates to a preparation method and application of a layered two-dimensional material-coated nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] In the development and utilization of new energy, people need chemical energy storage devices with high energy conversion efficiency. Among many chemical power sources, lithium-ion batteries have attracted much attention because of their high energy density, long service life, low self-discharge, no memory effect, and environmental friendliness. As the raw material of lithium-ion batteries, cathode materials are the most critical part of lithium-ion batteries, and their energy density largely determines the energy density of a battery. At present, the layered structure positive electrode material LiCoO is the most widely used material in the market. 2 , but with the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/50H01M4/52H01M10/0525
CPCH01M4/366H01M4/38H01M4/502H01M4/523H01M10/0525H01M2004/028Y02E60/10
Inventor 徐亚峰徐海奇徐源李国光
Owner 河南海宏科技有限公司