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Method for removing insoluble quinoline particles on surfaces of carbon microspheres

A carbon microsphere and quinoline technology, applied in the field of coking, can solve the problem of insoluble particles of quinoline being unable to be removed, and achieve the effects of improving the first charge and discharge efficiency, being beneficial to engineering promotion, and improving the specific capacitance.

Active Publication Date: 2019-10-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvent separation technology mainly used in industry at present cannot remove the quinoline insoluble particles on the surface of carbon microspheres.

Method used

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  • Method for removing insoluble quinoline particles on surfaces of carbon microspheres
  • Method for removing insoluble quinoline particles on surfaces of carbon microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After classification, the carbon microspheres with an average particle size of 12 μm are retained, and 1 kg is put into the muffle furnace. After nitrogen replacement, the temperature was increased to 180°C at a temperature increase rate of 15°C / min. Switch the air source into the muffle furnace, the heating rate is 8°C / min, the temperature is raised to 380°C, and the temperature is maintained for 3h. Then cool to room temperature at a rate of 20°C / min. The carbon microsphere product with an average particle diameter of 12 μm was recovered by a classifier, the yield was 97.4%, the specific capacitance was 324 mAh / g, and the first charge-discharge efficiency was 93.6%.

Embodiment 2

[0024] After classification, the carbon microspheres with an average particle size of 23μm are retained, and 5kg is taken into the muffle furnace. After nitrogen replacement, the temperature is increased to 150°C at a temperature increase rate of 10°C / min. Switch the air source into the muffle furnace, the heating rate is 5℃ / min, the temperature is raised to 350℃, and it is kept for 2h. Then cool to room temperature at a rate of 15°C / min. The carbon microsphere product with an average particle diameter of 23μm was recovered by the classifier, the yield was 98.6%, the specific capacitance was 334mAh / g, and the first charge-discharge efficiency was 94.3%.

[0025] figure 1 with figure 2 The scanning electron micrographs of the carbon microspheres before and after treatment respectively show the reduction of quinoline insoluble particles on the surface. After the electrochemical test, the specific capacitance increased from 285mAh / g to more than 310mAh / g, and the first charge-di...

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Abstract

The invention especially relates to a method for removing insoluble quinoline particles on the surfaces of carbon microspheres, belonging to the technical field of coking. The method comprises the following steps: 1) subjecting pretreated carbon microspheres to size grading by using a grading system, and retaining the carbon microspheres with particle sizes in a range of 5 and 25 [mu]m; 2) puttingthe graded carbon microspheres into a muffle furnace, performing nitrogen displacement, and then carrying out heating to 150-180 DEG C at a heating rate of 10-15 DEG C / min; 3) introducing air into the muffle furnace, carrying out heating to350-380 DEG C at a heating rate of 5-8 DEG C / min so as to realize oxidation of carboxyl groups of terminal carbon chains in the insoluble quinoline particles,maintaining the temperature for 2 to 3.5 h, and then carrying out cooling to room temperature at a rate of 15 to 30 DEG C / min by injecting air or inert gas; and 4) grading the treated carbon microspheres by using a cyclone grader, wherein the recovery range of the cyclone grader is set to be 5 to 25 [mu]m, and the insoluble quinoline particles having lower particle sizes are discharged through a dust removal system. The method effectively improves the specific electric capacity and the initial charge and discharge efficiency of the carbon microspheres, and can be realized by using a heating furnace alone, which is beneficial for industrial promotion.

Description

Technical field [0001] The invention relates to the technical field of coking, in particular to a method for removing quinoline insoluble particles on the surface of carbon microspheres. Background technique [0002] Mesocarbon microspheres (MCMB) are a kind of carbonaceous liquid crystal substance formed by thermal polymerization of medium temperature coal pitch, with a highly ordered layered structure. MCMB itself has a high degree of graphitization, excellent rate performance and stable physical and chemical properties. Mesophase carbon microspheres are currently the third mainstream carbon anode material in the anode material market after natural graphite and artificial graphite, and have obvious advantages in power batteries such as airplanes and power tools. In recent years, the anode material market is rapidly expanding with the popularization of electric vehicles. As a high-quality anode material, carbon microspheres have once again become a research hotspot for carbon m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215H01M4/583H01M4/62
CPCC01B32/215H01M4/583H01M4/625Y02E60/10
Inventor 张展庞克亮姚君贾楠楠张馨予朱庆庙
Owner ANGANG STEEL CO LTD
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