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Mesocarbon microbeads and preparation method and application thereof

A technology of mesocarbon microspheres and hard carbon, which is applied in the preparation/purification of carbon, chemical instruments and methods, inorganic chemistry, etc., and can solve the problem of poor lithium intercalation capacity and compaction performance of mesocarbon microspheres, and hard carbon structure. thick and other issues

Active Publication Date: 2020-11-06
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of poor lithium intercalation capacity and compaction performance of mesocarbon microspheres in the prior art due to too thick hard carbon structure

Method used

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  • Mesocarbon microbeads and preparation method and application thereof
  • Mesocarbon microbeads and preparation method and application thereof
  • Mesocarbon microbeads and preparation method and application thereof

Examples

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preparation example Construction

[0053] In a second aspect, the present invention provides a method for preparing mesophase carbon microspheres as described in the first aspect, the method comprising:

[0054] The raw material of the mesophase carbon microspheres is oxidized to obtain the mesophase carbon microspheres with the thickness of the hard carbon shell less than 0.5 μm.

[0055] Since the main component of the mesophase carbon microsphere raw material is carbon, which has strong reducibility, the present invention carries out oxidation treatment on the mesophase carbon microsphere raw material, which can effectively remove part or all of the shell of the carbon microsphere, so that The obtained mesophase carbon microspheres have excellent electrochemical performance. The process of the invention is simple, and the existing equipment can be used for production without major modification.

[0056] In an embodiment of the present invention, the raw material of the mesocarbon microspheres includes green...

Embodiment 1

[0104] The present embodiment prepares the negative electrode material according to the following method:

[0105] Mix carbon microspheres with a D50 of 11 μm and needle coke with a D50 of 10 μm in a ratio of 8:2, take 15 kg and put it into the electromagnetic induction furnace;

[0106] Introduce a mixed gas with a volume ratio of carbon dioxide and argon of 10:90, heat up to 1500°C at a rate of 10°C / min, and keep it for 2 hours for oxidation treatment; then cool to room temperature at a rate of 15°C / min. The powder was dispersed and sieved, then graphitized at 2800°C for 2 hours, and then crushed and sieved to obtain a graphitized product of carbon microspheres with a D50 of 9 μm (negative electrode material).

Embodiment 2

[0108] The present embodiment prepares the negative electrode material according to the following method:

[0109] Put 3 kg of carbon microsphere graphitization finished product with D50 of 12 μm (the thickness of the hard carbon shell is 1.5 μm) into the box furnace;

[0110] Introduce a mixed gas with a volume ratio of water vapor and argon of 15:85, heat up to 900°C at a rate of 8°C / min, and keep it for 1.5 hours; then cool to room temperature at a rate of 20°C / min, crush and screen After separation, a carbon microsphere graphitized product (negative electrode material) with a D50 of 11 μm was obtained.

[0111] figure 2 The scanning electron microscope image of the negative electrode material obtained in this example shows that the particle size uniformity of the negative electrode material is relatively good.

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Abstract

The invention relates to mesocarbon microbeads and a preparation method and application thereof. And in the mesocarbon microbeads, the thickness of the hard carbon shell is less than 0.5 [mu]m. The problems that in the prior art, due to the fact that the hard carbon structure of mesocarbon microbeads is too thick, the lithium intercalation capacity and the compaction performance of the mesocarbonmicrobeads are poor are solved. In the mesocarbon microbeads provided by the invention, the shells which cover the surfaces of the mesocarbon microbeads and have hard carbon structures become very thin or are wholly removed (the thickness is less than 0.5 [mu]m), so that the mesocarbon microbeads have higher lithium intercalation and deintercalation capacity and better compaction performance.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a mesophase carbon microsphere, its preparation method and application. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high voltage, long cycle life, and environmental friendliness, and have been widely used in portable electronic devices, new energy vehicles, and energy storage. The core part of a lithium-ion battery is the key materials used in it, including negative electrode materials, positive electrode materials, electrolytes, and separators. [0003] In recent years, with the rapid development of new energy vehicles and various electronic products, the requirements for the energy density, cycle performance and rate performance of lithium-ion batteries are getting higher and higher. Therefore, the preparation of lithium-ion batteries with high energy density, long cycle and fast Rechargeable anode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/133H01M10/0525C01B32/05C01B32/205C01B32/21
CPCH01M4/583H01M4/133H01M10/0525C01B32/05C01B32/205C01B32/21H01M2004/027Y02E60/10
Inventor 徐晓东任建国苗艳丽黄友元贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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