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Grapheme anode material and preparation method thereof

A graphene anode, graphene technology, which is applied in the preparation/purification of graphene and carbon, chemical instruments and methods, etc., can solve the problems of inability to solve the first coulomb efficiency, low electrode sheet resistance, etc., to enrich pores and reduce agglomeration , the effect of uniform particles

Active Publication Date: 2019-04-09
广东永邦新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The graphene composite material for the lithium ion battery negative electrode provided by the invention has high electrical conductivity, the resistance of the obtained electrode sheet is low, and the structure is stable in the charging and discharging process, and the prepared lithium ion secondary battery has high capacity and good safety. , excellent cycle performance and long service life, it oxidizes graphene-based materials in a concentrated acid environment, and mixes them with titanium sources after ultrasonic dispersion, which cannot solve the problem of low first-time coulombic efficiency

Method used

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  • Grapheme anode material and preparation method thereof

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Embodiment 1

[0026] A graphene negative electrode material, comprising graphene, soluble mesophase pitch, and mesophase micron-scale carbon microspheres, the mass ratio of which is 100:5:2, and the soluble mesophase pitch is coated on the surface of the mesophase micron-scale carbon microspheres , forming core-shell particles, which are evenly distributed inside the graphene.

[0027] Its preparation method is as follows:

[0028] Add carbon microspheres, lithium acetate, melamine, and methanol into the flask at a mass ratio of 1:2:1:160, and react with ultrasonic vibration at room temperature for 50 minutes, then evaporate to dryness under reduced pressure with a rotary evaporator at 50°C to obtain dry powder, and dry The powder was placed in a tube furnace, sintered at 850°C for 4 hours under the protection of nitrogen, washed with 2mol / L dilute hydrochloric acid and then washed with distilled water until neutral, and dried to obtain nitrogen-doped carbon microspheres; nitrogen-doped car...

Embodiment 2

[0031] A graphene negative electrode material, comprising graphene, soluble mesophase pitch, and mesophase micron-scale carbon microspheres, the mass ratio of which is 80:3:1, and the soluble mesophase pitch is coated on the surface of the mesophase micron-scale carbon microspheres , forming core-shell particles, which are evenly distributed inside the graphene.

[0032] Its preparation method is as follows:

[0033]Add carbon microspheres, lithium acetate, melamine, and ethanol into the flask at a mass ratio of 1:2:1:150, and react with ultrasonic shock at room temperature for 60 minutes, then evaporate to dryness under reduced pressure with a rotary evaporator at 40°C to obtain dry powder, and dry The powder is placed in a tube furnace, sintered at 850°C for 5 hours under the protection of nitrogen, washed with 2mol / L dilute hydrochloric acid and then washed with distilled water until neutral, and dried to obtain nitrogen-doped carbon microspheres; nitrogen-doped carbon micr...

Embodiment 3

[0036] A graphene negative electrode material, comprising graphene, soluble mesophase pitch, and mesophase micron-scale carbon microspheres, the mass ratio of which is 100:5:2, and the soluble mesophase pitch is coated on the surface of the mesophase micron-scale carbon microspheres , forming core-shell particles, which are evenly distributed inside the graphene.

[0037] Its preparation method is as follows:

[0038] Add carbon microspheres, lithium acetate, melamine, and isopropanol into the flask at a mass ratio of 1:2:1:200, and react with ultrasonic vibration at room temperature for 30 minutes, then evaporate to dryness under reduced pressure with a rotary evaporator at 60°C to obtain a dry powder. Put the dry powder in a tube furnace, sinter at 800°C for 5 hours under the protection of nitrogen, wash with 2mol / L dilute hydrochloric acid and then wash with distilled water until neutral, and obtain nitrogen-doped carbon microspheres after drying; nitrogen-doped carbon Add...

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Abstract

The invention provides a graphene anode material and a preparation method thereof and relates to the field of battery materials. The graphene anode material comprises graphene, soluble mesophase pitchand mesophase micron-sized carbon microspheres in the mass ratio of 50-100:1-5:1-5; the soluble mesophase pitch is coated on the surface of the mesophase micron-sized carbon microspheres to form core-shell particles; the core-shell particles are evenly distributed inside the grapheme. The graphene anode material provided by the invention has the coulombic efficiency of more than 91% and the firstdischarge capacity of more than 1150 mAh / g, has excellent charge and discharge performance and is suitable for use as a lithium battery material.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a graphene negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are "the most competitive power source in the 21st century" due to high voltage, high energy, light weight, small size, small internal resistance, low self-discharge rate, long cycle life, and no memory effect. With the advancement of science and technology, lithium-ion batteries will be widely used in electric vehicles, aerospace, biomedical engineering and other fields. Therefore, the research and development of lithium-ion battery materials is of great significance. For lithium-ion batteries, the key is to increase power density and energy density, and the improvement of energy density and power density is basically the improvement of electrode and negative electrode materials. [0003] Graphene's high electrical conductivity, high thermal conductivity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01B32/05H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525C01B32/05C01B32/194C01B2204/22Y02E60/10
Inventor 姚学永曹扬
Owner 广东永邦新能源股份有限公司
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