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Hollow carbon sphere and preparation method thereof

A technology of hollow spheres and cross-linked polystyrene, which is applied in the field of preparation of carbon hollow spheres, can solve the problems of complex process, poor control of product structure and morphology, and difficulty in industrial production, and achieve simple preparation process and easy industrial production Effect

Active Publication Date: 2011-04-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chemical preparation of carbon hollow spheres is mainly carried out by the template method and the template-free method. The template method mainly uses a core-shell structure composite sphere with a carbonizable shell. structure, such methods usually require expensive template spheres, the process is complicated and the yield is low, and it is difficult to industrialize production, while the template-free method is mainly prepared by thermal reduction of metals and carbon-containing solvents. Such methods require harsh reaction conditions, and Poor control over product structure and morphology

Method used

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  • Hollow carbon sphere and preparation method thereof
  • Hollow carbon sphere and preparation method thereof
  • Hollow carbon sphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, the preparation of carbon hollow sphere

[0031] (1) Preparation of cross-linked polystyrene spheres

[0032] 6g of polyvinylpyrrolidone (Mw=400,000g / mol) and 1.5g of 2,2'-azo[2-(2-imidazolin-2-yl)propane]dihydrochloride were dissolved in 250mL at 25°C. Add dropwise the mixture of 50g styrene and divinylbenzene monomer in deionized water (the mass percent composition of divinylbenzene in this mixture is 30%; In this system, 2,2'-azo[2-(2- Imidazolin-2-yl) propane] dihydrochloride, polyvinylpyrrolidone and the molar concentration of the mixture of styrene and divinylbenzene monomers are 22.12mmol / L, 0.048mmol / L and 1730mmol / L), the whole The dropwise addition process needs to be carried out under continuous stirring (stirring rate: 800r / min), then keep the stirring rate constant and raise the temperature to 80°C for 24 hours. After the reaction is completed, return to room temperature and centrifuge (centrifugal speed: min) washed 5 times with water to ob...

Embodiment 2

[0037] Embodiment 2, the preparation of carbon hollow sphere

[0038] (1) Preparation of cross-linked polystyrene spheres

[0039]Dissolve 2g of polyvinylpyrrolidone (Mw=500,000g / mol) and 350mg of 2,2'-azo[2-(2-imidazolin-2-yl)propane]dihydrochloride in 250mL at 25°C Add dropwise the mixture of 12.5g styrene and divinylbenzene monomer in water (the mass percent composition of divinylbenzene in this mixture is 50%; In this system, 2,2'-azo[2-(2- Imidazolin-2-yl) propane] dihydrochloride, polyvinylpyrrolidone and the molar concentration of the mixture of styrene and divinylbenzene monomers are 5.16mmol / L, 0.016mmol / L and 432mmol / L), the whole The dropwise addition process needs to be carried out under continuous stirring (stirring rate: 800r / min), then keep the stirring rate constant and raise the temperature to 65°C for 32 hours. After the reaction, return to room temperature and centrifuge (centrifugal speed: 10000r / min min) and washed 5 times with water to obtain 12 g of cr...

Embodiment 3

[0048] Embodiment 3, the preparation of carbon hollow sphere

[0049] (1) Preparation of cross-linked polystyrene spheres

[0050] Dissolve 6g of polyvinylpyrrolidone (Mw=600,000g / mol) and 3g of 2,2'-azo[2-(2-imidazolin-2-yl)propane]dihydrochloride in 250mL at 25°C Add dropwise the mixture of 80g styrene and divinylbenzene monomer in water (the mass percent composition of divinylbenzene in this mixture is 80%; In this system, 2,2'-azo[2-(2-imidazole The molar concentration of the mixture of phen-2-yl) propane] dihydrochloride, polyvinylpyrrolidone and styrene and divinylbenzene monomer is 44.24mmol / L, 0.04mmol / L and 1560mmol / L), the whole drop The addition process needs to be carried out under continuous stirring (stirring rate: 800r / min), then keep the stirring rate constant and raise the temperature to 80°C for 48 hours, then return to room temperature and centrifuge (centrifugal speed: 10000r / min) ) washed 5 times with water to obtain 75 g of cross-linked polystyrene ball...

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Abstract

The invention provides a hollow carbon sphere and a preparation method thereof. The preparation method comprises the following steps: 1) styrene and divinylbenzene is subject to polymerization reaction in the presence of an initiator, a stabilizer and a solvent to obtain crosslinked polystyrene spheres; 2) the crosslinked polystyrene spheres and sulfonating agents are subject to sulfonation reaction to obtain sulfonated crosslinked polystyrene spheres; and 3) the sulfonated crosslinked polystyrene spheres are sintered, thus obtaining the hollow carbon spheres. The preparation method provided by the invention has the advantages that the template spheres are cheap and can be obtained easily, the preparation process is simple, and industrial production can be realized easily.

Description

technical field [0001] The invention relates to a method for preparing carbon hollow spheres, which belongs to the field of preparation of nanometer hollow sphere materials. Background technique [0002] Carbon hollow spheres are a class of functional materials with special structures, which are widely used in energy, catalysis, medical and other fields. In recent years, with the deepening of research on lithium-ion batteries in portable electronic products, electric vehicles and plug-in hybrid electric vehicles, it has been found that carbon hollow spheres can not only be used as conductive carriers for various battery active materials, but also directly as electrodes. active substance use, and thus have received widespread attention. At present, the chemical preparation of carbon hollow spheres is mainly carried out by the template method and the template-free method. The template method mainly uses a core-shell structure composite sphere with a carbonizable shell. struc...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/00
Inventor 郭玉国辛森万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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