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A kind of multiphase tunable carbon-coated artificial graphite anode material and preparation method thereof

An artificial graphite negative electrode and carbon-coated technology, which is applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of weak artificial control ability of finished products with microstructure, unguaranteed application safety performance of materials, and poor safety performance of materials. Determining factors and other issues to achieve the effect of improving charge and discharge performance, improving fast charge performance, and regulating size

Active Publication Date: 2022-08-02
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the actual commercial use of graphite anode materials has a relatively single microstructure forming method, and the ability to artificially control the finished microstructure is not strong. Most of them are random, or after the structure is formed, it is compensated and modified by post-processing, which consumes too much resources. At the same time, the late structural modification is often accompanied by the introduction of many side reactions, which introduce new uncertain factors to the safety performance of the material, and the application and safety performance of the material cannot be guaranteed.

Method used

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Examples

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preparation example Construction

[0028] A preparation method of a multiphase adjustable carbon-coated artificial graphite negative electrode material, comprising the following steps:

[0029] S1, use the diluent to mix with the coating agent to obtain a mixture;

[0030] S2, adding natural graphite into the thermal reactor, adding the above-mentioned mixture, stirring and mixing, and performing heat treatment under the protection of an inert gas to obtain a graphite precursor;

[0031] S3, the graphite precursor is heat-treated under the protection of an inert gas to obtain a graphite negative electrode material.

[0032] In the step S2, the heat treatment curve is 0.5-1.5°C / min, rising from room temperature to 550-600°C, and then increasing to 1100-1500°C at a heating rate of 6-7°C / min for 1.5 -2.5h.

[0033] In the step S3, the heat treatment curve is 0.5-1.5°C / min, rising from room temperature to 550-600°C, and then rising to 1100-1500°C at a heating rate of 6-7°C / min for 1.5°C. -2.5h.

[0034] The dil...

Embodiment 1

[0040] A preparation method of a multiphase adjustable carbon-coated artificial graphite negative electrode material, comprising the following steps:

[0041] S1, use the diluent to mix with the coating agent to obtain a mixture;

[0042] S2, adding natural graphite into the thermal reactor, adding the above-mentioned mixture, stirring and mixing, and performing heat treatment under the protection of an inert gas to obtain a graphite precursor;

[0043] S3, the graphite precursor is heat-treated under the protection of an inert gas to obtain a graphite negative electrode material.

[0044] In the S2 step, the heat treatment curve is 0.5°C / min, rising from room temperature to 550°C, and then increasing to 1100°C at a heating rate of 6°C / min for 1.5h.

[0045] In the S3 step, the heat treatment curve is 1°C / min, from room temperature to 570°C, and then to 1200°C at a heating rate of 6.5°C / min for 2 hours.

[0046] The diluent is ethanol.

[0047] In the step S2, the stirring ...

Embodiment 2

[0049] A preparation method of a multiphase adjustable carbon-coated artificial graphite negative electrode material, comprising the following steps:

[0050] S1, use the diluent to mix with the coating agent to obtain a mixture;

[0051] S2, adding natural graphite into the thermal reactor, adding the above-mentioned mixture, stirring and mixing, and performing heat treatment under the protection of an inert gas to obtain a graphite precursor;

[0052] S3, the graphite precursor is heat-treated under the protection of an inert gas to obtain a graphite negative electrode material.

[0053] In the S2 step, the heat treatment curve is 1°C / min, rising from room temperature to 580°C, and then increasing to 1100°C at a heating rate of 6°C / min for 1.5h.

[0054] In the step S3, the heat treatment curve is 1.5°C / min, rising from room temperature to 600°C, and then increasing to 1500°C at a heating rate of 7°C / min for 2.5h.

[0055] The diluent is ethanol.

[0056] In the step S2, th...

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Abstract

The invention relates to the field of negative electrode materials, in particular to an artificial graphite negative electrode material coated with multi-phase adjustable carbon, including a graphite layer and a carbon coating layer; the particle size Dv50 of the graphite layer is 5-30 μm, which further improves the performance of the graphite layer. Particle stability, regulating the size of graphite particles, and improving the fast charging performance of the material; the present invention also provides a preparation method of a multiphase adjustable carbon-coated artificial graphite negative electrode material, comprising the following steps: S1, using a diluent and coating S2, adding natural graphite into the thermal reactor, adding the above mixture, stirring and mixing, and performing heat treatment under the protection of inert gas to obtain a graphite precursor; S3, heat treatment of the graphite precursor under the protection of inert gas , the graphite anode material was obtained. The process is simple and easy to promote.

Description

technical field [0001] The invention relates to the field of negative electrode materials, in particular to an artificial graphite negative electrode material coated with multiphase adjustable carbon and a preparation method thereof. Background technique [0002] The lithium battery energy industry has developed rapidly in recent years, and the lithium battery related industries have also developed rapidly at the same time. At present, the voice of the world banning fuel vehicles is increasing day by day, and the ban on fuel vehicles has been put on the agenda by many countries around the world. Therefore, the demand for graphite anode materials is also increasing. The larger the size, the ordinary artificial graphite processing needs to go through four major processes, while the high-end graphite needs more processes, and there are certain technical barriers. The secondary granulation, carbonization coating, secondary coating, doping modification and other processes in high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583
CPCH01M4/366H01M4/583H01M2004/027Y02E60/10
Inventor 余盛豪何文干仰永军
Owner DONGGUAN KAIJIN NEW ENERGY TECH