Process for producing a silicon-carbon composite
AssigneeEvonik Operations GmbH
InventorsJulia Lyubina, Michael Kroell
Life of this patent
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Abstract
Process for producing a silicon-carbon composite powder in which a) a gas stream A containing at least one starting compound of silicon selected from the group consisting of SiH4, Si2H6 and Si3H8, and b) a gas stream B containing at least one starting compound of carbon selected from the group consisting of methane, ethane, propane, ethylene and acetylene are reacted in a hot wall reactor at a temperature of less than 900° C., the reaction mixture is cooled or allowed to cool and the pulverulent reaction product is separated from gaseous materials.
Claims9
A process for producing a silicon-carbon composite powder, the process comprising:
- feeding
- a) a gas stream A comprising at least one silicon starting compound selected from the group consisting of SiH4, Si2H6 and Si3H8, and
- b) a gas stream B comprising at least one carbon starting compound selected from the group consisting of methane, ethane, propane, ethylene and acetylene into a hot wall reactor at a temperature of less than 900° C., to form a reaction mixture, cooling the reaction mixture or allowing the reaction mixture to cool, and separating a pulverulent reaction product, to obtain the silicon-carbon composite powder,
- wherein the gas stream B is fed into the hot wall reactor after the gas stream A.
A lithium-ion battery anode comprising a silicon-carbon composite powder, having an Si/C volume fraction in a range of 20:1 to 1:10 and comprising silicon particles having an average diameter of 300 nm or less, wherein a surface of the silicon particles is at least partly encapsulated with an amorphous, carbon-comprising layer having an average layer thickness of less than 200 nm.
Dependencies are inferred from the claim text.