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Graphite negative electrode material, preparation method thereof and lithium ion battery

A graphite negative electrode and graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low first efficiency of materials, life attenuation, and cycle deterioration, and achieve the effects of reducing side reactions, improving expansion, and improving cycle performance

Pending Publication Date: 2022-05-13
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing solutions do not solve the problem that the overall first effect of the material is still low due to the side reaction between the introduced shell and the electrolyte. At the same time, the conventional core-shell structure cannot prevent the electrolyte from penetrating into the material during the cycle. Inside the particle, the electrolyte continues to react with the natural graphite in the core, accompanied by the co-intercalation of anions and solvent molecules, resulting in severe volume expansion, resulting in cycle deterioration and life attenuation.

Method used

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  • Graphite negative electrode material, preparation method thereof and lithium ion battery
  • Graphite negative electrode material, preparation method thereof and lithium ion battery
  • Graphite negative electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0078] Second aspect, such as figure 1 Shown, the application provides a kind of preparation method of graphite negative electrode material, comprises the following steps:

[0079] S100, thermally polymerizing the mixture comprising graphite, coating agent and modifying additive to obtain a precursor, wherein the mass ratio of the coating agent to the modifying additive is (1-99):1, the The modifying additive includes a compound containing an element M, said M being selected from at least one of B, N and P;

[0080] S200, subjecting the precursor to carbonization treatment under a protective atmosphere to obtain a graphite negative electrode material.

[0081] In the preparation method of the graphite negative electrode material provided by the application, the modified additive reacts with the coating agent during the thermal polymerization treatment, and the group containing the M element is grafted into the carbon coating layer, which can reduce the first cycle. During th...

Embodiment 1

[0114] (1) select the flake graphite whose particle diameter is about 195 mesh to pulverize, spheroidize, classify, purify to obtain spherical graphite, and the average particle diameter of spherical graphite is D 50 15um;

[0115] (2) The spherical graphite and the coating agent petroleum-based pitch (150° C. of softening point, 45% carbon residue) are used in a mass ratio of 90 / 10, and the coating agent and the modification additive ammonium dihydrogen phosphate are used in a mass ratio of 90 / 10. 10 for mixing, after mixing, carry out thermal polymerization treatment in a high-temperature reactor, and high-purity nitrogen gas is introduced into the reactor as a protective gas, the thermal polymerization treatment temperature is 550 ° C, and the treatment time is 3 hours to obtain a precursor;

[0116] (3) Carry out carbonization treatment on the precursor in a carbonization kiln under a nitrogen atmosphere, the gas flow rate is 20ml / s, the carbonization treatment temperature...

Embodiment 2

[0121] (1) select the flake graphite whose particle diameter is about 195 mesh to pulverize, spheroidize, classify, purify to obtain spherical graphite, and the average particle diameter of spherical graphite is D 50 15um;

[0122] (2) The spherical graphite and the coating agent petroleum-based pitch (softening point 150 ° C, carbon residue 45%) are mixed according to the mass ratio of 90 / 10, and the coating agent and the modified additive urea are mixed according to the mass ratio of 90 / 10 , after mixing, thermal polymerization treatment is carried out in a high-temperature reactor, and high-purity nitrogen gas is introduced into the reactor as a protective gas. The thermal polymerization treatment temperature is 550 ° C, and the treatment time is 5 hours to obtain a precursor;

[0123] (3) Carry out carbonization treatment on the precursor in a carbonization kiln under a nitrogen atmosphere, the gas flow rate is 20ml / s, the carbonization treatment temperature is 800°C, and ...

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Abstract

The invention relates to a graphite negative electrode material, a preparation method thereof and a lithium ion battery, the graphite negative electrode material comprises spherical graphite and a carbon coating layer, the carbon coating layer comprises a modified group containing an M element, and M is selected from at least one of B, N and P. The preparation method of the graphite negative electrode material comprises the following steps: performing thermal polymerization treatment on a mixture containing spherical graphite, a coating agent and a modified additive to obtain a precursor; wherein the modified additive comprises a compound containing an element M, and M is selected from at least one of B, N and P; and performing carbonization treatment on the precursor in a protective atmosphere to obtain the graphite negative electrode material. According to the graphite negative electrode material prepared by the invention, expansion of natural graphite can be improved, and the cycle performance is improved.

Description

technical field [0001] The application relates to the field of lithium ion batteries, and relates to a graphite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Natural graphite is one of the main graphite anode materials for lithium-ion batteries. It has the advantages of high capacity, high compaction, environmental friendliness and low price. It is widely used in 3C, electric tools and other fields. In recent years, the application field of lithium-ion batteries has gradually expanded to power, and higher requirements have been put forward for the cycle performance and environmental tolerance of lithium batteries. However, because traditional natural graphite is mechanically crushed from flake graphite, its particles The rich void structure is retained inside. These void structures make the contact area between the material and the electrolyte much larger than that of artificial graphite with the same part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525Y02E60/10H01M2004/027H01M4/583H01M2004/021H01M4/366C01B32/05H01M4/0471
Inventor 吴璇樊小华周海辉任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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