Honeycomb three-dimensional porous silicon/carbon composite material and preparation method thereof

A silicon-carbon composite material and three-dimensional porous technology are applied in the field of preparation of nanoporous composite materials to achieve the effects of precise regulation of pore distribution and size, stable structure and easy operation.

Active Publication Date: 2016-09-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are relatively few reports on honeycomb three-dimensional porous silicon-carbon composite materials. Patents CN201510054606.8, CN201410276413.2 and CN201510007562.9 report a preparation method of porous silicon-carbon composite materials. The obtained porous silicon is not a regular honeycomb continuous structure.

Method used

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  • Honeycomb three-dimensional porous silicon/carbon composite material and preparation method thereof
  • Honeycomb three-dimensional porous silicon/carbon composite material and preparation method thereof
  • Honeycomb three-dimensional porous silicon/carbon composite material and preparation method thereof

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preparation example Construction

[0032] The preparation method of silicon-carbon composite material of the present invention, the concrete steps of this method are:

[0033] Step (1), preparation of silica: use Stober method in alcohol phase medium, catalyze tetrabutyl orthosilicate (TEOS) with ammonia water, form monodisperse spherical silica particles through hydrolysis-condensation, and adjust the pH value Control the particle size at 80-800 nanometers;

[0034] Step (2), stirring and mixing the acrylate unsaturated resin monomer and the photoinitiator at normal temperature to 80° C. to obtain a mixed solution; the mass content of the photoinitiator in the mixed solution is 0.2 to 2.0%;

[0035] The acrylate unsaturated resin monomer is a vinyl thermosetting resin, specifically bisphenol A-diglycidyl methacrylate, triethylene glycol dimethacrylate, diethylene glycol dimethacrylate One or more of esters, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, eth...

Embodiment 1

[0048] Step (1), preparation of silica: use Stober method in alcohol phase medium, catalyze tetrabutyl orthosilicate (TEOS) with ammonia water, form monodisperse spherical silica particles through hydrolysis-condensation, and adjust the pH value The control particle size is 400 nanometers;

[0049] Step (2), 4g of bisphenol A-diglycidyl methacrylate, 6g of triethylene glycol dimethacrylate, and 0.05g of Yanjiagu 819 were stirred and mixed evenly at room temperature to obtain 10.05g of a mixed solution ;

[0050] Step (3), adding 1 g of silicon dioxide obtained in step (1) to the above mixed solution, stirring for 2 hours, to obtain a mixed solution containing silicon dioxide;

[0051] Step (4), injecting the above-mentioned mixed solution containing silicon dioxide into the mold, curing with ultraviolet light, and illuminating for 300 seconds at a power of 50W, to obtain a silicon dioxide / polyacrylate composite solid material;

[0052] Step (5), pulverizing the silica / polyac...

Embodiment 2

[0059] Step (1), preparation of silica: use Stober method in alcohol phase medium, catalyze tetrabutyl orthosilicate (TEOS) with ammonia water, form monodisperse spherical silica particles through hydrolysis-condensation, and adjust the pH value Control the particle size at 80 nanometers;

[0060] Step (2): Stir and mix 9.98g bisphenol A-diglycidyl methacrylate and 0.02g Yanjiagu 1173 at 80°C to obtain a mixed solution;

[0061] Step (3), adding 0.001 g of silicon dioxide obtained in step (1) to 9.999 g of the above mixed solution, stirring for 1 hour, to obtain a mixed solution containing silicon dioxide;

[0062] Step (4), injecting the above-mentioned mixed solution containing silicon dioxide into the mold, curing with blue light, and illuminating for 300 seconds at a power of 5W, to obtain a silicon dioxide / polyacrylate composite solid material;

[0063] Step (5), pulverizing the silica / polyacrylate composite solid material for 5 minutes to obtain solid particles.

[006...

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Abstract

The invention discloses a honeycomb three-dimensional porous silicon/carbon composite material and a preparation method thereof. The porous silicon/carbon composite material is of a hybrid structure that nano silicon spheres are distributed in a honeycomb continuous three-dimensional porous carbon matrix, wherein the mass content of carbon is 99%-1% and controllable. The honeycomb three-dimensional porous silicon/carbon composite material is prepared from 80-800nm spherical silicon dioxide nanoparticles as a silicon source and thermosetting difunctional acrylate unsaturated resin as a carbon source by employing a method of reduction after compounding; and an acrylate unsaturated resin monomer is vinyl thermosetting resin. The cumbersome problem that traditional thermosetting resin needs to utilize a solvent is solved through in-situ polymerization of vinyl thermosetting resin; post-treatment is not needed; the operation is simple and convenient; and the honeycomb three-dimensional porous silicon/carbon composite material is green and environment-friendly. Meanwhile, the thermosetting resin is difficult to melt in the high-temperature calcination process, so that in-situ carbon formation can be achieved; the distribution condition of silicon dioxide can be effectively regulated and controlled; and the shape and form of the final product are regulated and controlled.

Description

technical field [0001] The invention belongs to the field of preparation of nanoporous composite materials, and in particular relates to a honeycomb three-dimensional continuous porous silicon-carbon composite material prepared by in-situ composite, in-situ carbonization and magnesia thermal reduction and a method thereof. Background technique [0002] With the rapid development of industries such as electric vehicles, the demand for lithium-ion batteries with high energy density and high power density is increasingly urgent. At present, graphite materials are generally used as anode materials for commercial lithium-ion batteries, but the theoretical lithium storage capacity of graphite is only 372mAh / g, and the lithium intercalation potential platform is close to metal lithium, so fast charging or low-temperature charging is prone to lithium precipitation, causing safety hazards. Therefore, it is imminent to develop new high-performance anode materials. The theoretical spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M4/38H01M2004/021Y02E60/10
Inventor 程亚军左秀霞朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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