Composite carbon microsphere preparation method, composite carbon microsphere and lithium ion capacitor prepared with composite carbon microsphere

A technology of composite carbon and carbon microspheres, which is applied in the preparation/purification of carbon, hybrid capacitor electrodes, chemical instruments and methods, etc. It can solve the problems of shedding of coating layer, incomplete and uniform coating layer, etc., and achieve high tap density , Reduce the peeling phenomenon, the effect of excellent electrochemical performance

Active Publication Date: 2018-01-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating layer formed on the graphite surface by the existing method is not complete and uniform, causing the coating layer to fall off during the cycle of the electrode.

Method used

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  • Composite carbon microsphere preparation method, composite carbon microsphere and lithium ion capacitor prepared with composite carbon microsphere
  • Composite carbon microsphere preparation method, composite carbon microsphere and lithium ion capacitor prepared with composite carbon microsphere
  • Composite carbon microsphere preparation method, composite carbon microsphere and lithium ion capacitor prepared with composite carbon microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of composite carbon microspheres, comprising the following steps:

[0035] (1) Put 10g of glucose in a 100mL hydrothermal reaction kettle, conduct a hydrothermal reaction at 150°C for 2 hours, and obtain hydrothermal carbon microspheres after suction filtration, washing and drying;

[0036] (2) Disperse the hydrothermal carbon microspheres in 80 mL of deionized water, add cetyltrimethylammonium bromide (CTAB) with a mass of 0.2% of the hydrothermal carbon microspheres and ultrasonically disperse them for 0.5 h, then stir the reaction at room temperature 2h;

[0037] (3) Move the reaction system to an ice-water bath, add pyrrole monomer with 2% mass of hydrothermal carbon microspheres, stir for 2 hours, add ammonium persulfate solution dropwise, and control the molar ratio of pyrrole monomer to ammonium persulfate 1, reacted in an ice-water bath for 6 hours, and after the reaction, washed, filtered, and dried to obtain a carbon microsphere precursor...

Embodiment 2

[0042] A preparation method of composite carbon microspheres, comprising the following steps:

[0043](1) Put 10g of sucrose in a 100mL hydrothermal reaction kettle, conduct a hydrothermal reaction at 180°C for 2 hours, and obtain hydrothermal carbon microspheres after suction filtration, washing and drying;

[0044] (2) Disperse the hydrothermal carbon microspheres in 80 mL of deionized water, add cetyltrimethylammonium bromide (CTAB) with 5% mass of the hydrothermal carbon microspheres and ultrasonically disperse them for 0.5 h, then stir the reaction at room temperature 2h;

[0045] (3) Move the reaction system to an ice-water bath, add aniline monomer with 10% mass of hydrothermal carbon microspheres, stir for 2 hours, add ammonium persulfate solution dropwise, and control the molar ratio of aniline monomer to ammonium persulfate 2, react in an ice-water bath for 6 hours, after the reaction, wash, filter, and dry to obtain the carbon microsphere precursor;

[0046] (4) I...

Embodiment 3

[0050] A preparation method of composite carbon microspheres, comprising the following steps:

[0051] (1) Put 10 g of sisal cellulose microcrystals in a 100 mL hydrothermal reaction kettle, conduct a hydrothermal reaction at 250° C. for 2 hours, and obtain hydrothermal carbon microspheres after suction filtration, washing, and drying;

[0052] (2) Disperse the hydrothermal carbon microspheres in 80 mL of deionized water, add 10% dodecyltrimethylammonium bromide (DTAB) of hydrothermal carbon microspheres by ultrasonic dispersion for 0.5 h, and stir the reaction at room temperature 2h;

[0053] (3) Move the reaction system to an ice-water bath, add pyrrole monomer with 20% mass of hydrothermal carbon microspheres, stir for 2 hours, add ammonium persulfate solution dropwise, and control the molar ratio of pyrrole monomer to ammonium persulfate 4, react in an ice-water bath for 6 hours, after the reaction, wash, filter with suction, and dry to obtain the carbon microsphere precu...

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Abstract

A composite carbon microsphere preparation method includes steps: (1) taking low-molecular carbohydrates, cellulose microcrystalline or thermoplastic phenolic resin as a precursor to prepare hydrothermal carbon microspheres through hydrothermal reaction; (2) subjecting the hydrothermal carbon microspheres obtained in the step (1) to surfactant modification to obtain modified carbon microspheres; (3) under the action of an initiator, subjecting conducting polymer monomers to in-situ polymerization on surfaces of the modified carbon microspheres obtained in the step (2) to obtain carbon microsphere precursors; (4) subjecting the carbon microsphere precursors to catalytic pyrolysis under the action of catalysts, and then performing acid pickling and drying to obtain composite carbon microspheres. The carbon microspheres prepared according to the method are small in particle size and high in tap density, nitrogen doped amorphous carbon is formed on surfaces of the composite carbon microspheres after catalytic pyrolysis, improvement of capacity and electric conductivity of carbon materials is benefited, and excellent electrochemical performances are achieved.

Description

technical field [0001] The invention belongs to the field of carbon materials, in particular to a carbon microsphere and its preparation method and application. Background technique [0002] Lithium-ion batteries have many advantages such as high voltage, large specific capacity, stable discharge voltage and high safety, and have become one of the hot spots in the research and development of new secondary chemical power sources. . At present, the anode materials for commercial application are mainly graphite materials, but due to the high anisotropy of graphite, the rate performance of graphite is not good, and graphite is easy to be peeled off in PC electrolyte, so the surface is generally coated to improve electrochemical performance. It is a common method to coat a layer of amorphous carbon on the surface of materials with high crystallinity such as graphite by gas phase, liquid phase, and solid phase processes, which can not only retain the advantages of high capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/205H01G11/24H01G11/32H01G11/50
CPCY02E60/13
Inventor 郭华军杨哲伟王志兴李新海王接喜彭文杰胡启阳胡蓉
Owner CENT SOUTH UNIV
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