Artificial graphite negative electrode material with gradient structure and preparation and application thereof

A technology of artificial graphite negative electrode and gradient structure, which is applied in nanotechnology, structural parts, battery electrodes and other directions for materials and surface science, can solve the problems of long process flow, regulation of structure and lack of effective regulation of graphitization degree, etc. To achieve the effect of improving electrical performance

Active Publication Date: 2019-04-05
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology generally has the problems of long process flow and high energy consumption, which brings great challenges to the requirements of environmental protection and energy saving.
In addition, the existing technology is difficult to achieve the control of the internal structure of the material. For example, there is still a lack of effective control of the pore size distribution and graphitization degree of the material, which limits the further improvement of the electrochemical performance of the material.

Method used

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  • Artificial graphite negative electrode material with gradient structure and preparation and application thereof
  • Artificial graphite negative electrode material with gradient structure and preparation and application thereof
  • Artificial graphite negative electrode material with gradient structure and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) crushing, grading, and shaping the anthracite raw coal to obtain anthracite powder with a particle size range of 5-100 microns and an average particle size of 30 microns;

[0079] (2) Pretreating the anthracite powder treated in the first step. First, mix anthracite powder and potassium hydroxide as an activator in an aqueous solution at a mass ratio of 1:3, and after standing for 12 hours, continue stirring at 80° C. until the water evaporates to dryness to obtain a uniform mixture of anthracite and potassium hydroxide; The homogeneous mixture was placed in an argon atmosphere muffle furnace, and reacted at 800°C for 2 hours; after the reaction, the mixture was acid-washed and washed with water until neutral to remove excess potassium hydroxide, and activated after drying at 105°C for 24 hours After anthracite, the specific surface area is 1200m 2 / g, the average pore diameter is 5 nanometers, and the pore diameter range is 1-1000nm;

[0080] (3) After activation...

Embodiment 2

[0084] (1) crushing, grading, and shaping the anthracite raw coal to obtain anthracite powder with a particle size range of 5-100 microns and an average particle size of 30 microns;

[0085] (2) Pretreating the anthracite powder treated in the first step. First, mix anthracite powder and potassium hydroxide as an activator in an aqueous solution at a mass ratio of 1:4, and after standing for 12 hours, continue stirring at 80° C. until the water evaporates to dryness to obtain a uniform mixture of anthracite and potassium hydroxide; Put the homogeneous mixture into an argon atmosphere muffle furnace, and react at 850°C for 2 hours; after the reaction, the mixture is washed with acid and water until neutral to remove excess potassium hydroxide, and dried at 105°C for 24 hours to be activated After anthracite, the specific surface area is 1500m 2 / g, the average pore diameter is 8 nanometers, and the pore diameter range is 1-1000nm;

[0086] (3) After activation, the anthracite...

Embodiment 3

[0090] (1) crushing, grading, and shaping the anthracite raw coal to obtain anthracite powder with a particle size range of 5-100 microns and an average particle size of 30 microns;

[0091] (2) Pretreating the anthracite powder treated in the first step. First, mix anthracite powder and potassium hydroxide as an activator uniformly in an aqueous solution at a mass ratio of 1:5, and after standing for 12 hours, continue stirring at 80° C. until the water evaporates to dryness to obtain a uniform mixture of anthracite and potassium hydroxide; Put the homogeneous mixture into an argon atmosphere muffle furnace, and react at 850°C for 2 hours; after the reaction, the mixture is washed with acid and water until neutral to remove excess potassium hydroxide, and dried at 105°C for 24 hours to be activated After anthracite, the specific surface area is 1800m 2 / g, the average pore diameter is 10 nanometers, and the pore diameter range is 1-1000nm;

[0092] (3) Immerse the anthracit...

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Abstract

The invention belongs to the technical field of a lithium ion battery negative electrode material, and particularly discloses an artificial graphite negative electrode material with a gradient structure. The artificial graphite negative electrode material is a carbon material with a core/shell structure, and the graphitization degree and the porosity of the carbon material are in gradient distribution in a radial direction; and from core to shell, the graphitization degree is gradually reduced, and the porosity is gradually reduced. The invention also provides the artificial graphite negativeelectrode material with the gradient structure. By pore-forming, catalyst carrying and two-segment electro-forging on anthracite, the negative electrode material with the graphitized and porosity dual-gradient structure can be prepared; and the material with the gradient structure is compatible with the advantages of high reversible capacity, high rate performance, long cycle lifetime and the like.

Description

Technical field: [0001] The invention relates to the technical field of producing negative electrode materials for lithium-ion batteries, in particular to a method for producing artificial graphite negative electrode materials with a gradient structure using a two-stage electric calcining method Background technique: [0002] With the rapid development of electric vehicles, lithium-ion batteries as the core power source have attracted much attention, and the demand for lithium-ion batteries with high specific energy, high specific power, long life and low cost is increasing. Artificial graphite has long been used as an anode material for commercial lithium-ion batteries due to its high specific capacity, low discharge platform, and long cycle life. However, with the changes in the market situation, artificial graphite anodes are currently facing two major problems. On the one hand, the development of new technologies has higher and higher requirements for battery core materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 周昊宸
Owner 湖南宸宇富基新能源科技有限公司
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