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US 12,545,587 B2Granted
Recycled graphite surface repair and conductive carbon separation
AssigneesMexichem Fluor Inc., Ascend Elements, Inc.
InventorRakan Ashour
Life of this patent
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Abstract
A process to make battery-grade graphite from black mass. The process entails spheronizing graphite derived from black mass to yield spheronized graphite, classifying the spheronized graphite to remove conductive carbon fines, and optionally coating the resulting bulk graphite to reduce its specific surface area.
Claims17
A process to make battery-grade graphite anode active material from black mass, the method comprising:
- (a) providing black mass from recycled lithium-ion batteries, the black mass comprising graphite, at least a part of which is damaged anode material
- (b) spheronizing at least a portion of the graphite contained in the black mass of step (a) to yield spheronized graphite;
- and
- (c) classifying the spheronized graphite from (b) to remove fines having a D50<about 8 μm, thereby yielding battery-grade graphite anode active material.
1 more element
A process to make battery-grade graphite anode active material from black mass, the method comprising:
- (a) providing black mass from recycled lithium-ion batteries, the black mass comprising graphite, at least a part of which is damaged anode material
- (b) spheronizing at least a portion of the graphite contained in the black mass of step (a) to yield spheronized graphite;
- and
- (c) classifying the spheronized graphite from (b) to remove fines having a D50<about 8 μm, thereby yielding battery-grade graphite anode active material;
- and
- (d) coating the battery-grade graphite anode active material with amorphous carbon comprising petroleum pitch, coal tar pitch, or mixtures thereof, in a weight percentage of from about 0.5 to about 15 wt % to yield coated graphite.
3 more elements
Dependencies are inferred from the claim text.