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Graphite material with shell-core structure and preparation method thereof

A technology of graphite material and shell-core structure, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of large irreversible capacity, and achieve the effects of low cost, high specific capacity and high tap density

Active Publication Date: 2008-09-24
湖南海容新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to Chinese patent application 03126631.2, the amorphous carbon obtained after polymer cracking generally has better compatibility with organic electrolytes and better cycle stability, but its irreversible capacity is larger and its discharge platform is not as ideal as graphite

Method used

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  • Graphite material with shell-core structure and preparation method thereof
  • Graphite material with shell-core structure and preparation method thereof
  • Graphite material with shell-core structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] With 5000g common artificial graphite powder (tap density 0.95g / cm 3 , specific surface area 4.5m 2 / g,D 50 =20μm, degree of graphitization 84%) add cryogenic crushing to D 90= 800g of asphalt powder of 18 μm, and ball milled and mixed for 5 hours; the mixed powder was pressed into blocks and packed into a graphite crucible, and raised to 900°C at a heating rate of 60°C / hour under an argon atmosphere and kept at a temperature of 1 hour, then naturally cooled to At room temperature, take out the graphite block and crush it into a powder, add it again and crush it to D 90 = 500g of asphalt powder of 18 μm, put the mixed powder into a graphite crucible, put it into a carbon tube furnace, heat up to 3000°C at a rate of 120°C / hour and keep it warm for 1 hour, cool naturally to room temperature, open the container, take out the graphite and crush it and sieve it. Graphite with a shell-core structure is obtained.

[0039] In order to check the performance of lithium-ion ba...

Embodiment 2

[0041] Add cryogenic pulverization to D in embodiment 1 90 =18μm asphalt quantity is changed to 300g.

[0042] The detection method is the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0044] The common artificial graphite powder in embodiment 1 is changed into spherical natural graphite, and its index is tap density 1.00g / cm 3 , specific surface area 5.8m 2 / g,D 50 =19 μm, graphitization degree 96%.

[0045] The detection method is the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a graphite material with case structure, which is composed of graphite inner-core and case on the inner core, wherein the case is graphite structure.

Description

technical field [0001] The invention relates to a modified graphite material, in particular to a graphite material with a core-shell structure, which can be used as a negative electrode material in a lithium ion battery. [0002] The present invention also relates to a preparation method of the above-mentioned modified graphite material. Background technique [0003] Due to high voltage, high capacity density, no memory effect and no pollution, lithium-ion batteries have become a research hotspot in the battery industry in recent years. One of the key materials to achieve high capacity and miniaturization of lithium-ion batteries is the negative electrode material. The negative electrode materials currently used in commercial lithium-ion batteries are basically carbon materials, such as artificial graphite, natural graphite, and mesocarbon microspheres (MCMB). ), petroleum coke, pyrolytic resin carbon, etc. [0004] The electrochemical theoretical capacity of graphite is 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04H01M4/38
CPCY02E60/12Y02E60/10
Inventor 许晓落吴沙黄越华
Owner 湖南海容新材料有限责任公司
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