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Preparation method of artificial graphite charcoal negative electrode material and prepared artificial graphite charcoal negative electrode material

A technology of artificial graphite and negative electrode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low yield, poor cycle stability and low discharge capacity of carbon negative electrode materials, and achieve excellent comprehensive performance, good discharge performance, The effect of reducing the specific surface area

Active Publication Date: 2007-03-14
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above composition is fired into a composite carbon material containing graphite-carbon carbonized by organic binder materials under an inert atmosphere or a non-oxidizing atmosphere. The graphite-carbon products generated by this method do not need to be pulverized, but the initial discharge capacity Low, about 240mAh / g, poor initial cycle stability
And the productive rate that adopts existing method to prepare carbon anode material by artificial graphite is relatively low, generally less than 100%

Method used

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  • Preparation method of artificial graphite charcoal negative electrode material and prepared artificial graphite charcoal negative electrode material
  • Preparation method of artificial graphite charcoal negative electrode material and prepared artificial graphite charcoal negative electrode material
  • Preparation method of artificial graphite charcoal negative electrode material and prepared artificial graphite charcoal negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 300 kilograms (kg) of artificial graphite powder (D 50 23.8μm, specific surface area 7.8m 2 / g) and 125kg coal tar pitch are added to the reaction kettle alternately while stirring, and after feeding is completed, under nitrogen protection (nitrogen flow rate 0.4m 3 / h), after continuing to stir for 1 hour, add the solvent washing oil of 45L (47.25kg, account for 11.12% of the total weight of graphite micropowder and asphalt) in 15 minutes, add solvent and start to heat up simultaneously, open vacuum pump after heating up 1 hour, make still Keep the internal vacuum at 0.06-0.08MPa for 20 minutes to remove the light components in the material, then pass nitrogen to balance, and continue to pass nitrogen after the balance is completed, the flow of nitrogen is 0.4m 3 / h. After 6 hours of heating up, the temperature rose to 530°C, and the second vacuuming was started to remove the heavy components and solvent washing oil in the material (the solvent was recovered se...

Embodiment 2

[0039] Weigh 330kg artificial graphite powder (D 50 18.6μm, specific surface area 4.1m 2 / g) and 110kg coal tar pitch are added to the reactor alternately while stirring, and after feeding is completed, under nitrogen protection (nitrogen flow rate 0.8m 3 / h), after continuing to stir for 1.5 hours, add 60.8L (63.8kg, accounting for 14.5% of the total weight of graphite micropowder and asphalt) solvent washing oil in 40 minutes, add the solvent and start to heat up simultaneously, open the vacuum pump after heating up for 1 hour , keep the vacuum in the kettle at 0.06-0.08MPa for 30 minutes to remove the light components in the material, then pass nitrogen to balance, continue to pass nitrogen after the balance is completed, and the nitrogen flow rate is 0.8m 3 / h. After 8 hours of heating up, the temperature rises to 570°C, and the second vacuuming is started to remove the heavy components and solvent washing oil in the material (the solvent will be recovered separately). ...

Embodiment 3

[0041] Weigh 450kg artificial graphite powder (D 50 20.9μm, specific surface area 6.4m 2 / g) and 40kg coal tar pitch are added to the reaction kettle alternately while stirring, and after the feeding is completed, under nitrogen protection (nitrogen flow rate 1.2m 3 / h), after continuing to stir for 0.5 hours, add the oil washing solvent of 39.7L (41.65kg, accounting for 8.5% of the total weight of graphite micropowder and asphalt) within 20 minutes, add the solvent and start to heat up simultaneously, and start the vacuum pump after heating up for 1.5 hours , keep the vacuum in the kettle at 0.06-0.08MPa for 40 minutes to remove the light components in the material, and then pass nitrogen to balance. After the balance is completed, continue to pass nitrogen, and the nitrogen flow rate is 1.2m 3 / h. After starting to heat up for 5 hours, the temperature rises to 560°C, and the second vacuuming is started to remove the heavy components and solvent washing oil in the material ...

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Abstract

The preparation process of artificial graphite charcoal as negative pole material includes the following steps: 1. adding artificial graphite powder and asphalt in the weight ratio of 1.5-19 to 1 while stirring, stirring for further 0.5-3 hr, and adding reaction assistant in 4-20 wt% of graphite powder and asphalt within 10-50 min; 2. heating to 500-600 deg.c in 4-10 hr and pumping out the light component in the first 1-2 hr; 3. maintaining at 500-600 deg.c for 3-8 hr while pumping out the heavy components and reaction assistant; 4. cooling to room temperature and 5. graphitizing. The present invention has environment friendship and high yield, and the prepared artificial graphite charcoal as negative pole material has the advantages of common artificial graphite, the density near that of natural graphite and lowered specific surface area.

Description

technical field [0001] The invention relates to a carbon negative electrode material and a preparation method thereof, in particular to a preparation method of an artificial graphite carbon negative electrode material and the artificial graphite carbon negative electrode material prepared by the method. Background technique [0002] Since Japan's Sony Corporation successfully developed lithium-ion batteries with carbon materials as negative electrodes in 1991, the lithium-ion battery industry has developed rapidly and has been widely used in mobile phones, cameras, notebook computers and portable appliances. Lithium-ion batteries have the characteristics of high working voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life. They are ideal energy sources for development in the 21st century. [0003] The carbon negative electrode material of lithium ion secondary battery is mainly graphite powder at p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/96
CPCY02E60/50
Inventor 王剑桥冯苏宁刘芳丁晓阳于宪张志清
Owner 福建杉杉科技有限公司
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