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Modified ternary positive electrode material and preparation method thereof and lithium-ion battery

A positive electrode material and modification technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor coating stability of graphene, improve coating stability, improve dispersibility and structural stability, process The effect of process simplification

Inactive Publication Date: 2018-08-24
CHINA AVIATION LITHIUM BATTERY LUOYANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a modified ternary positive electrode material, thereby solving the problem of poor stability of graphene coating existing in existing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The modified ternary positive electrode material of this embodiment is prepared by the following steps:

[0028] 1) Graphene with a sheet number of 1-8 layers is added to water, after stirring evenly, ultrasonically disperse for 30min at a power of 150W, to obtain a graphene suspension with a mass content of graphene of 30%;

[0029] 2) Add polyvinylpyrrolidone to the graphene suspension, stir evenly, and ultrasonically disperse for 30min at a power of 150W to obtain a coating solution with a mass content of 3% polyvinylpyrrolidone;

[0030] 3) Add nickel-cobalt-manganese ternary material (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the quality of the nickel-cobalt-manganese ternary material is 3 times that of the graphene quality contained in the graphene suspension, ultrasonic dispersion 60min under the power of 150W, leave standstill to layering after ultrasonic dispersion, after pouring out the upper liquid phase, The lower layer is separated by a centrifuge at a rotational s...

Embodiment 2

[0032] The modified ternary positive electrode material of this embodiment is prepared by the following steps:

[0033]1) Add graphene with a sheet number of 1-8 layers into N,N-dimethylformamide, stir evenly, and ultrasonically disperse for 45 minutes at a power of 150W to obtain a graphene with a mass content of 40%. Graphene suspension;

[0034] 2) add polydiallyl dimethyl ammonium chloride in the graphene suspension, after stirring, ultrasonic dispersion 45min under the power of 150W, the mass content that obtains polydiallyl dimethyl ammonium chloride is 5% coating solution;

[0035] 3) Add nickel-cobalt-manganese ternary material (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the quality of the nickel-cobalt-manganese ternary material is 5 times that of the graphene quality contained in the graphene suspension, ultrasonic dispersion 100min under the power of 150W, leave standstill to layering after ultrasonic dispersion, after pouring out the upper liquid phase, The lower layer is...

Embodiment 3

[0037] The modified ternary positive electrode material of this embodiment is prepared by the following steps:

[0038] 1) adding graphene with a sheet number of 1-8 layers into N-methylpyrrolidone, stirring evenly, and ultrasonically dispersing for 60 minutes at a power of 150W to obtain a graphene suspension with a mass content of graphene of 50% ;

[0039] 2) adding sodium polystyrene sulfonate to the graphene suspension, after stirring evenly, ultrasonically disperse for 60min at a power of 150W, to obtain a coating solution with a mass content of sodium polystyrene sulfonate of 6%;

[0040] 3) Add nickel-cobalt-manganese ternary material (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the quality of the nickel-cobalt-manganese ternary material is 6 times that of the graphene quality contained in the graphene suspension, ultrasonic dispersion 120min under the power of 150W, leave standstill to layering after ultrasonic dispersion, after pouring out the upper liquid phase, The lower la...

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Abstract

The invention relates to a modified ternary positive electrode material and a preparation method thereof and a lithium-ion battery. According to the preparation method, coating treatment is carried out on a ternary positive electrode material by using a coating solution containing graphene and a water-soluble polymer to obtain the modified ternary positive electrode material, wherein the water-soluble polymer is one or more of polyvinylpyrrolidone, polydiallyl dimethyl ammonium chloride and sodium polystyrene sulfonate. According to the preparation method of the modified ternary positive electrode material provided by the invention, coating treatment is carried out on the ternary positive electrode material by using the graphene and the water-soluble polymer, so that the surface adhesion capacity of the graphene can be improved through the water-soluble polymer and the coating stability of the graphene is improved; and meanwhile, a surface coating layer of the obtained modified ternarypositive electrode material contains the graphene and the water-soluble polymer, so that the dispersity and the structural stability of the positive electrode material in subsequent battery production can be improved through the water-soluble polymer, such as the polyvinylpyrrolidone, thereby fully developing the characteristics of the graphene and the ternary material.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a modified ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion battery is a very competitive green and clean energy and energy storage means, and it is also an important means to solve the current energy crisis and the greenhouse effect. Lithium-ion batteries have many advantages, such as high battery capacity, high power density, stable working voltage, and long cycle life, so they have received extensive attention. After Sony launched commercial lithium-ion batteries in 1991, lithium-ion battery technology has developed rapidly and has been widely used in portable electronic products, electric vehicles and other fields. [0003] The energy density of lithium-ion batteries is mainly limited by the specific capacity of the cathode material, the ternary cathode material (LiNi x co ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 李彦龙李振李利淼陈曼
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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