Method of manufacturing high-surface-area silicon
OwnerAlexander Mukasyan, Vasiliy Mukasyan +1inventors
InventorsAlexander Mukasyan, Vasiliy Mukasyan, Mikael Nersesyan
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Abstract
A method for synthesis of high surface-area (>100 m2/g) and nanosized (≦100 nm) silicon powder by initiation of self-sustained combustion reaction in a mixture of silicon dioxide and magnesium powders in a sealed reactor chamber under pressurized inert gas atmosphere. A specific feature of the method is rapid cooling of the product at a rate of 100 K/s to 400 K/s in the area directly behind the combustion front.
Claims15
A method of manufacturing high-surface-area silicon powder from silicon dioxide (SiO2) and magnesium (Mg) in a sealable reactor, the silicon powder having surface area equal to or greater than 100 m2/g and a particle size equal to or less than 100 nm, the method comprising the following steps:
- (1) preparing a homogeneous reactant green mixture from silicon dioxide (SiO2) and magnesium (Mg);
- (2) loading the reaction mixture into the sealable reactor;
- (3) filling the reactor with an inert gas and providing optimum inert gas pressure inside the reactor;
- (4) providing initial local heating of the powder mixture and initiating a combustion reaction;
- (5) causing self-sustained reaction under the effect of exothermic heat of the reaction and obtaining a combustion product that comprises silicon and a magnesium oxide phase;
- (6) cooling the combustion product at a rate in the range of 100 K/s to 400 K/s;
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- (7) carrying out post-synthesis treatment of the product that involves leaching in order to completely eliminate the magnesium oxide phase followed by short-term milling.
Dependencies are inferred from the claim text.