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US 12,463,202 B2Granted
Method for the production of a silicon-graphite composite material
AssigneeTalga Technologies Limited
InventorFengming Liu
Life of this patent
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Abstract
A method for the production of a silicon-graphite composite material, the method comprising subjecting a silicate containing graphite material to a magnesiothermic reduction process and thereby producing a silicon-graphite composite material. The method further provides for the production of a silicon and graphite composite material without the need for pre-synthesis of the silicate containing graphite material.
Claims19
A method for the production of a silicon-graphite composite material, the method comprising the following steps:
- (i) drying a concentrate of a silicate containing graphite material comprising a natural graphite material that has a silica/silicate naturally distributed therein;
- (ii) mixing the graphite material with magnesium powder;
- (iii) a reduction step comprising transferring the mixture from step (ii) to a furnace whilst subject to a flow of an inert gas, at a temperature of about 600-900° C. for about 1-4 hrs, at the conclusion of which the mixture is allowed to cool;
- (iv) an oxidation step in which as the temperature cools to about 500-550° C. the inert gas flow is stopped, and air is allowed into the furnace, after which the temperature of about 500-550° C. is maintained for about 1-2 hrs, at the conclusion of which the mixture is allowed to cool to room temperature;
- and
- (v) a leach step in HCl, as a purification step, with a residence time of between about 1-3 hrs, after which the resulting residue/powder is separated.
3 more elements
A method for the production of a silicon-graphite composite material, the method comprising:
- subjecting a silicate containing graphite material comprising a natural graphite material that has a silica/silicate naturally distributed therein, to a magnesiothermic reduction process,
- treating a product of the magnesiothermic reduction process in an oxidation step immediately after the magnesiothermic reduction process, and
- subjecting a product of the oxidation step to one or more purification steps, thereby producing a silicon-graphite composite material.
Dependencies are inferred from the claim text.