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Preparation method of artificial graphite and lithium ion battery

A technology of artificial graphite and graphitization treatment, which is applied in the direction of secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor fast charging performance and safety performance of lithium-ion batteries, irregular shape of single-particle artificial graphite powder, lithium Ion transport slow kinetics and poor performance, to achieve the effect of favorable internal resistance, reduced internal resistance, and good liquid absorption performance

Pending Publication Date: 2022-01-21
内蒙古斯诺新材料科技有限公司
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Problems solved by technology

However, ordinary single-particle artificial graphite powder has irregular shape, large specific surface area, and high degree of anisotropy, resulting in poor material processing performance, easy expansion during use, and poor kinetics of lithium ion transport, which makes lithium ion The fast charging performance and safety performance of the battery are poor

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  • Preparation method of artificial graphite and lithium ion battery
  • Preparation method of artificial graphite and lithium ion battery
  • Preparation method of artificial graphite and lithium ion battery

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preparation example Construction

[0030] In view of this, the present invention proposes a kind of preparation method of artificial graphite, in one embodiment, described preparation method comprises the following steps:

[0031] Step S10, subjecting the raw coke powder to graphitization treatment to obtain an intermediate;

[0032] Step S20, uniformly mixing the second raw material and the intermediate to obtain a composite precursor;

[0033] Step S30 , carbonizing the composite precursor at 900-1400° C. under the protection of protective gas to obtain artificial graphite.

[0034] In this embodiment, the particle size of the raw coke powder is 4-15 μm. By selecting raw coke with a small particle size, the channel resistance for lithium ions to enter the graphite layer can be shortened, so that the obtained artificial graphite exhibits more excellent performance. rate performance and low temperature performance. Wherein, the temperature of the graphitization treatment is 2800-3200°C.

[0035] In one embod...

Embodiment 1

[0052] (1) Putting the needle coke into a mechanical crushing and shaping machine for crushing and shaping to obtain needle coke powder, the particle size D50 of the needle coke powder is 6 μm.

[0053] (2) The needle coke powder is graphitized at a high temperature in an Acheson furnace to obtain an intermediate product, wherein the graphitization temperature is 3000°C.

[0054] (3) The liquid-phase coating agent (a mixture of coal tar and pitch oil) and the conductive agent (carbon nanotubes) are stirred and mixed at high speed in a container, wherein the mass ratio of the liquid-phase coating agent to the conductive agent is 1 : 1 (that is, the mass fraction of the conductive agent is 50%), after compounding, the second raw material is obtained.

[0055] (4) Under a nitrogen atmosphere, mix the intermediate and the above-mentioned second raw material in a mixer at high speed, wherein the mass ratio of the second raw material to the intermediate is 5:95 to obtain a composite...

Embodiment 2

[0058] (1) Putting the needle coke into a mechanical crushing and shaping machine for crushing and shaping to obtain needle coke powder, the particle size D50 of the needle coke powder is 10 μm.

[0059] (2) The needle coke powder is graphitized at a high temperature in an Acheson furnace to obtain an intermediate product, wherein the graphitization temperature is 3000°C.

[0060] (3) Stir and mix the liquid-phase coating agent (liquid pitch) and the conductive agent (carbon black) in a container at high speed, wherein the mass ratio of the liquid-phase coating agent to the conductive agent is 6:4 (that is, the conductive agent The mass fraction of is 40%), compound and obtain the second raw material.

[0061] (4) Under a nitrogen atmosphere, mix the intermediate and the above-mentioned second raw material in a mixer at high speed, wherein the mass ratio of the second raw material to the intermediate is 8:92 to obtain a composite precursor.

[0062] (5) The composite precurso...

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Abstract

The invention discloses a preparation method of artificial graphite and a lithium ion battery. The preparation method of the artificial graphite comprises the following steps: S10, carrying out graphitization treatment on raw material coke powder to obtain an intermediate; s20, uniformly mixing a second raw material with the intermediate to obtain a composite precursor; amd s30, carrying out carbonization treatment on the composite precursor at 900-1400 DEG C under the protection of protective gas to obtain artificial graphite; wherein the second raw material comprises a liquid-phase coating agent. Through liquid phase coating, the surface morphology of the artificial graphite can be effectively improved, the specific surface area is reduced, active sites of side reactions are reduced, gas production of the lithium ion battery is reduced, volume expansion is reduced, and the safety performance of the lithium ion battery is improved; in addition, graphitization treatment is performed firstly and then coating is performed, so that the prepared artificial graphite has relatively good liquid absorption performance, the internal resistance is reduced, the low-temperature performance is improved, the reduction of the internal resistance is beneficial to the movement of lithium ions, and the prepared lithium ion battery has relatively good fast charging performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of artificial graphite and lithium ion batteries. Background technique [0002] The new energy automobile industry is highly recognized by national policies and the market. Lithium-ion batteries, a high-tech product, are the core energy components and have the advantages of being green and environmentally friendly. With the popularization of new energy vehicles and charging piles, the rapid development of science and technology, and the continuous improvement of living standards, people have higher requirements for the fast charging performance and safety performance of batteries. The fast charging and safety performance of lithium-ion batteries mainly depend on the performance of materials, and negative electrode materials play an important role in it. [0003] Graphite anode materials have the advantages of high cycle efficiency, good cycle p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 舒畅段传阳明明刘文葛彪彪
Owner 内蒙古斯诺新材料科技有限公司
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