Process for the preparation of SiOx having a nanoscale filament structure and use thereof as anode material in lithium-ion batteries
AssigneeHydro-Quebec
InventorsDominic Leblanc, Abdelbast Guerfi, Karim Zaghib, Pierre Hovington, Julie Trottier
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Abstract
A process for the preparation of nanofilament particles of SiOx in which x is between 0.8 and 1.2, the process comprising: a step consisting of a fusion reaction between silica (SiO2) and silicon (Si), at a temperature of at least about 1410° C., to produce gaseous silicon monoxide (SiO); and a step consisting of condensation of the gaseous SiO to produce the SiOx nanofilament particles. The process may also comprising using carbon.
Claims22
A process for the preparation of nanofilament particles of SiOx in which x is between 0.8 and 1.2, the process comprising:
- a step comprising a fusion reaction between silica (SiO2), liquid silicon (Si) and, a source of carbon, at a temperature of at least about 1410° C., to produce gaseous silicon monoxide (SiO);
- and
- a step comprising condensation of the gaseous SiO to produce the SiOx nanofilament particles, wherein the condensation step is performed in a low temperature area of a furnace, the gaseous SiO being moved to the low temperature area by a vector gas.
A process for the preparation of nanofilament particles of SiOx in which x is between 0.8 and 1.2, the process comprising the following steps:
- introducing liquid silicon (Si) in a furnace and bringing the temperature to at least about 1410° C.;
- introducing solid silica (SiO2) in the furnace while agitating the mixture and producing gaseous silicon monoxide (SiO);
- and
- moving the gaseous SiO to a low temperature area of the furnace using a vector gas, and condensing to yield the SiOx nanofilament particles.
A process for the preparation of nanofilament particles of SiOx in which x is between 0.8 and 1.2, the process comprising the following steps:
- introducing solid silica (SiO2) and a source of carbon in the furnace and bringing the temperature-to at least about 1410° C., and producing metallic silicon (Si) and gaseous silicon monoxide (SiO);
- and
- moving the gaseous SiO to a low temperature area of the furnace using a vector gas, and condensing to yield the SiOx nanofilament particles, wherein the furnace is a submerged arc furnace.
A material comprising nanofilament particles of SiOx in which x is between 0.8 and 1.2 obtained by a process comprising:
- a step comprising a fusion reaction between silica (SiO2), liquid silicon (Si), and, a source of carbon (C), at a temperature of at least about 1410° C., to produce gaseous silicon monoxide (SiO);
- and
- a step comprising condensation of the gaseous SiO to produce the SiOx nanofilament particles, wherein the condensation step is performed in a low temperature area of a furnace, the gaseous SiO being moved to the low temperature area by a vector gas.
Dependencies are inferred from the claim text.