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Graphite negative-electrode material with graphitization degree and hole diameter double-gradient structure, preparation method of material and application of material

A technology of graphite anode and degree of graphitization, applied in the field of production of anode materials for lithium ion batteries, can solve the problems of structure control, limited electrochemical performance of materials, lack of effective control of graphitization degree, etc., so as to improve electrical performance and optimize electrical performance. Effect

Active Publication Date: 2019-02-01
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

In the existing technology, it is difficult to control the internal structure of the material, for example, there is still a lack of effective control of the properties of the material such as the pore size distribution and the degree of graphitization, which limits the further improvement of the electrochemical performance of the material.

Method used

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  • Graphite negative-electrode material with graphitization degree and hole diameter double-gradient structure, preparation method of material and application of material
  • Graphite negative-electrode material with graphitization degree and hole diameter double-gradient structure, preparation method of material and application of material
  • Graphite negative-electrode material with graphitization degree and hole diameter double-gradient structure, preparation method of material and application of material

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Experimental program
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Effect test

Embodiment 1

[0076] (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;

[0077] (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;

[0078] (3) After activation...

Embodiment 2

[0082] (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;

[0083] (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; The homogeneous mixture was placed in an argon atmosphere muffle furnace, and reacted at 850°C for 2 hours; after the reaction, the mixture was washed with acid and water until neutral to remove excess potassium hydroxide, and was activated after drying at 105°C for 24 hours 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;

[0084] (3) After activation, t...

Embodiment 3

[0088] (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;

[0089] (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 1:5, 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;

[0090] (3) Immerse the anthracite after ac...

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Abstract

The invention belongs to the technical field of lithium ion battery negative-electrode materials, and particularly discloses a graphite negative-electrode material with a graphitization degree and hole diameter double-gradient structure. The graphite negative-electrode material is a carbon material with a core / shell structure, the graphitization degree and the hole diameter of the carbon materialare distributed in a radial gradient manner, the graphitization degree from a core to a shell is gradually reduced, and the hole diameter from the core to the shell is gradually reduced. The inventionfurther provides a preparation method of the graphite negative-electrode material with the double-gradient structure of the graphitization degree and the hole diameter. The graphite negative-electrode material serves as a catalyst in porous carbon pore gaps, and subsequent secondary electrical forging treatment is implemented to prepare the negative-electrode material with the double-gradient structure of the graphitization degree and the hole diameter. The material with the gradient structure has the advantages of high reversible capacity and rate performance, long cycle life and the like.

Description

Technical field: [0001] The invention relates to the technical field of producing lithium-ion battery negative electrode materials, in particular to a graphite negative electrode material with a graphitization degree and a double-gradient pore diameter structure produced by 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, as the market situation changes, 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 co...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 周昊宸
Owner 湖南宸宇富基新能源科技有限公司
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