Recycled graphite surface repair and conductive carbon separation
AssigneesMexichem Fluor Inc., Ascend Elements, Inc.
InventorRakan Ashour
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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.
Claims20
A process to make battery-grade graphite anode active material from black mass, the method comprising:
- (a) spheronizing graphite derived from black mass to yield spheronized graphite;
- and
- (b) classifying the spheronized graphite from (a) to remove fines having a D50 <about 8 μm, thereby yielding battery-grade graphite anode active material.
A process to make battery-grade graphite anode active material from black mass, the method comprising:
- (a) spheronizing graphite derived from black mass to yield spheronized graphite;
- and
- (b) classifying the spheronized graphite from (a) to remove fines having a D50 <about 8 μm, thereby yielding battery-grade graphite anode active material;
- and
- (c) coating the battery-grade graphite anode active material with amorphous carbon to yield coated graphite.
A process to make battery-grade graphite anode active material from black mass, the method comprising:
- (a) spheronizing graphite derived from black mass to yield spheronized graphite;
- and
- (b) classifying the spheronized graphite from (a) to remove fines having a D50 <about 8 μm, thereby yielding battery-grade graphite anode active material;
- and
- (c) 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.
Dependencies are inferred from the claim text.