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Hollow carbon sphere and preparation method thereof

A technology for hollow spheres and silica spheres, which is applied to the field of carbon hollow spheres and their preparation, can solve the problems of poor control of product structure and morphology, complicated processes, and difficulty in industrialized production, and achieves easy industrialized production and simple preparation process. 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

[0029] Embodiment 1, the preparation of carbon hollow sphere

[0030] (1) Preparation of silica spheres

[0031] Prepare an ethanol solution of ethyl orthosilicate at 25°C (the ratio of ethyl orthosilicate to ethanol is 1:4 by volume) and 30 mL of ethanol solution of ammonia (the ratio of ammonia to ethanol is 1:4) 60mL (in this system, the volume ratio of ethyl orthosilicate, ammonia water and ethanol is 1:2:12), under vigorous stirring (stirring speed 1000r / min), 2mL of the above prepared ethyl orthosilicate The ethanol solution was added to the ethanol solution of the ammonia water prepared above, and vigorously stirred (stirring speed 1000r / min) for 10 minutes, and then the remaining tetraethyl orthosilicate prepared above was mixed at a lower speed (stirring speed 800r / min) Add the ethanol solution to the ethanol solution of ammonia water prepared above, and keep stirring (stirring rate 800r / min) for 4h. After the reaction, the powder was collected by centrifuging, wash...

Embodiment 2

[0038] Embodiment 2, the preparation of carbon hollow sphere

[0039] (1) Preparation of silica spheres

[0040] Prepare a propanol solution of tetraethyl orthosilicate at 30°C (the volume fraction ratio of tetraethyl orthosilicate and propanol is 1:5) and 30 mL of a propanol solution of ammonia water (the volume fraction ratio of ammonia water and propanol is 1:4) 90mL (in this system, the volume ratio of tetraethyl orthosilicate, ammonia water and propanol is 1:3.6:19.4), under vigorous stirring (stirring rate 1000r / min), 5mL of the above-mentioned The propanol solution of ethyl silicate was added in the propanol solution of ammonia water prepared above, and vigorously stirred (stirring speed 1500r / min) for 20 minutes, then the above-mentioned prepared Add the remaining propanol solution of ethyl tetrasilicate to the above prepared ammonia solution in propanol, and keep stirring (stirring rate 600r / min) for 6h. Afterwards, the powder was collected by centrifuging, washing ...

Embodiment 3

[0052] Embodiment 3, the preparation of carbon hollow sphere

[0053] (1) Preparation of silica spheres

[0054] Prepare n-butanol solution of tetraethyl orthosilicate at 30°C (the volume fraction ratio of tetraethyl orthosilicate and n-butanol is 1:1) and 40 mL of n-butanol solution of ammonia water (volume of ammonia water and n-butanol Parts ratio is 1:2) 60mL (in this system, the volume and parts ratio of tetraethyl orthosilicate, ammonia water and n-butanol is 1:1:3), under vigorous stirring (stirring rate 1000r / min) 1mL The n-butanol solution of the tetraethyl orthosilicate prepared above was added in the n-butanol solution of the ammoniacal liquor prepared above, and vigorously stirred (stirring speed 1200r / min) for 10 minutes, then at a lower speed (stirring speed 600r / min) ) was added to the n-butanol solution of the remaining tetraethyl orthosilicate prepared above to the n-butanol solution of ammonia water prepared above, and kept stirring (stirring rate 1000r / min)...

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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 compounds are subject to polymerization reaction in silica sphere dispersion in which an initiator and a stabilizer are dissolved to obtain silica spheres coated by a polystyrene layer; 2) the silica spheres coated by the polystyrene layer are subject tosulfonation reaction to obtain silica spheres coated by a sulfonated polystyrene layer; 3) the silica spheres coated by the sulfonated polystyrene layer are sintered to obtain silica spheres coated by a carbon layer; and 4) the silica spheres coated by the carbon layer react with alkali or acid, thus obtaining the hollow carbon spheres. The preparation method provided by the invention has the advantages that the used 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 carbon hollow sphere and a preparation method thereof, belonging 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....

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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