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Graphite material with shell-core structure and preparation method thereof

A technology of graphite material and shell-core structure, which is applied to structural parts, electrical components, battery electrodes, etc., can solve the problems of large irreversible capacity and achieve the effects of low cost, low voltage platform and high tap density

Active Publication Date: 2007-03-07
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
Comparison scheme
Effect test

Embodiment 1

[0038]5000g of ordinary artificial graphite powder (tap density 0.95g / cm3, specific surface area 4.5m2 / g, D50=20um, degree of graphitization 84%) was added to 800g of asphalt powder cryogenically crushed to D90=18um, and ball milled for 5 hours ; Press the mixed powder into a block and put it into a graphite crucible, raise the temperature to 900°C at a rate of 60°C / hour under an argon atmosphere and keep it warm for 1 hour, then cool down to room temperature naturally, take out the graphite block and crush it into powder, and again Add 500g of asphalt powder crushed to D90=18um, put the mixed powder into a graphite crucible, put it into a carbon tube furnace, raise the temperature 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 and sieve to obtain graphite with a shell-core structure.

[0039] In order to check the performance of lithium-ion battery negative electrode materi...

Embodiment 2

[0041] Change the amount of asphalt added into Example 1 to 300g by cryogenically crushing to D90=18um.

[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 among the embodiment 1 is changed into spherical natural graphite, and its index is tap density 1.00g / cm3, specific surface area 5.8m2 / g, D50=19um, degree of graphitization 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 Applications(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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