Carbon-silicon composites and method of production thereof
AssigneeNanovace Technologies Limited
InventorsJawad HAIDAR, Mohammadreza ESKANDARIAN, Jing LIANG, Rajan GNANARAJAN
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Abstract
Disclosed herein is a method for producing carbon-silicon composites. The method comprises providing a reaction mixture comprising a carbon-silica-based precursor and an aluminium reductant; heating the reaction mixture in the presence of solid or gaseous aluminium chloride, or a mixture thereof, to a temperature at which reactions that result in the silica being reduced are initiated; controlling reaction conditions whereby the reaction mixture is prevented from reaching a temperature at which thermal runaway can occur; and isolating the produced carbon-silicon composites.
Claims47
A method for producing carbon-silicon composites, the method comprising:
- providing a reaction mixture comprising a carbon-silica-based precursor and an aluminium reductant;
- heating the reaction mixture in the presence of solid or gaseous aluminium chloride, or a mixture thereof, to a temperature at which reactions that result in the silica being reduced are initiated;
- controlling reaction conditions whereby the reaction mixture is prevented from reaching a temperature at which thermal runaway can occur;
- and
- isolating the produced carbon-silicon composites.
A method for reducing silica in a silica-based precursor, the method comprising:
- coating a silica-based powder with carbon to produce a carbon-coated silica-based precursor;
- providing a reaction mixture comprising the carbon-coated silica-based precursor and an aluminium reductant;
- heating the reaction mixture in the presence of solid or gaseous aluminium chloride, or a mixture thereof, to a temperature at which reactions that result in the silica being reduced are initiated;
- controlling reaction conditions whereby the reaction mixture is prevented from reaching a temperature at which thermal runaway can occur;
- and
- isolating reaction products that include reduced silica.
A method for producing carbon-silicon composites, the method comprising:
- providing a powder of natural graphite which contains between 0.1% and 20% per weight silica;
- and
- mixing and heating the powder with a reducing agent comprising aluminium in the presence of solid and/or gaseous aluminium chloride, whereby at least a part of the silica is reduced to silicon and a carbon-silicon composite powder is produced, together with a byproduct comprising Al2O3 and/or AlOCl;
- and
- optionally separating the carbon-silicon composites from the byproducts.
A carbon-silicon composite consisting of carbon, silicon and aluminium.
A carbon-silicon composite produced solely from rise husks.
Dependencies are inferred from the claim text.