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Natural graphite material as well as treatment method and application thereof

A treatment method, natural graphite technology, applied in the direction of graphite, electrical components, battery electrodes, etc., can solve the problems of reducing electrical properties, easily damaging the surface morphology of materials, destroying the specific surface area of ​​materials, etc., to achieve complete and uniform modification, pretreatment method Simple and feasible, the effect of increasing the regularity of the shape

Inactive Publication Date: 2014-06-11
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of reducing the electrical performance, destroying the specific surface area of ​​the original material, or easily damaging the surface morphology of the material in the existing technology for reducing the specific surface area, and provides a natural graphite material The treatment method and its application, the treatment method can significantly reduce the specific surface area of ​​natural graphite materials, and does not affect the original particle size distribution of the material, the regularity of the material morphology increases, does not affect the discharge capacity and efficiency, and the processing performance and sieving performance Improvement, good material safety, stable properties, almost no difference between batches

Method used

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  • Natural graphite material as well as treatment method and application thereof
  • Natural graphite material as well as treatment method and application thereof
  • Natural graphite material as well as treatment method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Natural graphite material (denoted as raw material A), D50 is 18±2μm, the raw material is 20 kg in total, the particle size is 18.4μm before sample processing, and the true density is 2.20g / cm 3 , specific surface area 2.1m 2 / g.

[0031] ①Put the natural graphite material in a drying oven and dry it for 2.5 hours. The drying temperature is 140°C; the moisture content after drying is 0.8%. , breaking the large particles, so that the material as a whole is dry and fine powder;

[0032] ② Check whether the equipment of the mixer is running normally, clean the mixer to ensure that there are no impurities in the mixer; put 20 kg of natural graphite materials with a D50 of 18.4 μm into the high-speed modified mixer for mixing, and the time is 90 Minutes, the speed is 420r / min; after that, pass through a 250-mesh sieve.

[0033] The tested particle size is 18.5μm, and the true density is 2.20g / cm 3 , specific surface area 1.8m 2 / g.

Embodiment 2

[0035] Natural graphite material (denoted as raw material B), D50 is 20±1μm, a total of 20 kg of raw materials, the detected particle size is 20.2μm, and the true density is 2.21g / cm 3 , specific surface area 2.0m 2 / g.

[0036] ①Put the natural graphite material in a drying oven and dry it for 2 hours. The drying temperature is 140°C; the moisture content after drying is 0.7%. , breaking the large particles, so that the material as a whole is dry and fine powder;

[0037] ② Check whether the equipment of the mixer is running normally, clean the mixer to ensure that there are no impurities in the mixer; put 20 kg of natural graphite materials with a D50 of 20.2 μm into the high-speed modified mixer for mixing, and the time is 90 Minutes, the speed is 430r / min; after that, pass through a 250-mesh sieve.

[0038] After testing, the particle size is 20.2μm, and the true density is 2.21g / cm 3 , specific surface area 1.8m 2 / g.

Embodiment 3

[0040] Natural graphite material (denoted as raw material A), D50 is 18μm±2μm, raw material is 20 kg in total, the particle size is 18.4μm before sample processing, and the true density is 2.20g / cm 3 , specific surface area 2.1m 2 / g.

[0041] ①Put the natural graphite material in a drying oven and dry it for 3.0 hours. The drying temperature is 130°C; the mass percentage of moisture after drying is 0.7%; Crush the large particles to make the material as a dry fine powder as a whole;

[0042] ② Check whether the equipment of the mixer is running normally, clean the mixer to ensure that there are no impurities in the mixer; put 20 kg of natural graphite materials with a D50 of 18.4 μm into the high-speed modified mixer for mixing, and the time is 120 Minutes, the speed is 430r / min; after that, pass through a 250-mesh sieve.

[0043] After testing, the particle size is 18.4μm, and the true density is 2.20g / cm 3 , specific surface area 1.7m 2 / g.

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Abstract

The invention discloses a treatment method of a natural graphite material, a natural graphite material treated by the method and application of the natural graphite material. The treatment method of the natural graphite material comprises the following steps: (1) drying the natural graphite material until the mass percent of moisture is less than or equal to 1%, and then grinding at a rotating speed of 20000-25000r / min for 5-10 minutes; (2) mixing the material obtained in the step (1) for 90-150 minutes, and then sieving. The treatment method is capable of obviously reducing the specific surface area of the natural graphite material without affecting the original particle size distribution of the material, and as a result, the material morphological regularity of the material is increased, the development of the discharge capacity and the efficiency is not affected, the processability and the sieving performance are improved, the material is good in safety and stable in property, and almost no difference exists between batches.

Description

technical field [0001] The invention relates to a natural graphite material and its processing method and application. Background technique [0002] In recent years, with the miniaturization of electronic devices, there has been an increasing demand for secondary batteries with better performance. Particularly eye-catching is the lithium-ion battery, which has a higher energy density and better performance than nickel-cadmium or nickel-metal hydride batteries. At present, the existing technology has conducted extensive research on improving battery performance. However, with the further improvement of battery performance requirements, it is necessary to further reduce the specific surface area of ​​the battery, so as to improve the overall material performance of natural graphite. [0003] Natural graphite material has good processing performance, but has the disadvantage of large surface area. During the production and processing of natural graphite materials, there are g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/38H01M4/133C01B32/21
CPCY02E60/122Y02E60/10
Inventor 杜旭杜辉玉丁晓阳乔永民李杰李虹娄文君
Owner SHANGHAI SHANSHAN TECH CO LTD
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