Method for recycling graphite and recycled graphite
AssigneeVianode AS
InventorsGunstein SKOMEDAL, Bridget Catherine DEVENEY
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Abstract
A method for producing recycled graphite, a recycled graphite, and a battery, includes the steps of providing a reclaimed graphite concentrate including any one or more of carboxymethyl cellulose and styrene-butadiene rubber, pre-treating the reclaimed graphite concentrate by subjecting the reclaimed graphite concentrate to an oxidizing environment at a temperature in the range 250-380° C., thereby reducing the total concentration of carboxymethyl cellulose and styrene-butadiene rubber to less than 0.25%, and thermally treating the pre-treated reclaimed graphite concentrate by subjecting the pre-treated reclaimed graphite concentrate to a non-oxidizing environment at a temperature of at least 2300° C.
Claims20
A method for producing recycled graphite, the method comprising:
- providing a reclaimed graphite concentrate comprising one or more of carboxymethyl cellulose and styrene-butadiene rubber;
- pre-treating the reclaimed graphite concentrate by subjecting the reclaimed graphite concentrate to an oxidizing environment at a temperature in a range 250-380° C., thereby reducing a total concentration of carboxymethyl cellulose and styrene-butadiene rubber in the reclaimed graphite concentrate to less than 0.25 wt. %;
- and
- thermally treating the pre-treated reclaimed graphite concentrate by subjecting the pre-treated reclaimed graphite concentrate to a non-oxidizing environment at a temperature of at least 2300° C.
A recycled graphite comprising:
- at most 0.25 wt. % of one or more of carboxymethyl cellulose, styrene-butadiene rubber, and residues thereof;
- and
- at most 0.01 wt. % of one or more of copper, nickel, magnesium, iron, manganese, aluminum, lithium, sulphur, and silicon.
Dependencies are inferred from the claim text.