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US 4,895,713 AGranted
Intercalation of graphite
AssigneeUnion Carbide Corporation
InventorsRonald A. Greinke, Robert A. Mercuri, Edgar J. Beck
Life of this patent
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Abstract
A method for intercalating graphite flakes which requires less intercalation solution and avoids a washing step, thus producing economy in material and production costs, and avoiding production of contaminated waste water which requires costly disposal steps.
Claims18
A method for intercalating graphite flakes which comprises;
- (a) adding liquid intercalation solution to graphite flakes in an amount of between 10 and 35 parts by weight of solution per 100 parts by weight of graphite flakes, the liquid intercalation solution comprising one or more members selected from the group consisting of nitric acid, sulfuric acid, potassium chlorate, chromic acid, potassium permangante, potassium chromate, potassium dichromate, perchloric acid, hydrogen peroxide, iodic acids, periodic acids, ferric chloride, and halides, and
- (d) dispersing the intercalation solution through the graphite flakes to produce intercalated graphite flakes, the intercalated graphite flakes having an exfoliation volume greater than about 100 cm.sup.3 /g when passed directly to exfoliation.
A method for forming exfoliated graphite flakes which comprises;
- (a) adding liquid intercalation solution to graphite flakes in an amount of between 10 and 35 parts by weight of solution per 100 parts by weight of graphite flakes, the liquid intercalation solution comprising one or more members selected from the group consisting of nitric acid, sulfuric acid, potassium chlorate, chromic acid, potassium permanganate, potassium chromate, potassium dichromate, perchloric acid, hydrogen peroxide, iodic acids, periodic acids, ferric chloride, and halides,
- (b) dispersing the interaction solution through the graphite flakes to produce intercalated graphite flakes, and
- (c) exfoliating the intercalated graphite flakes directly after step (b) to produce exfoliated graphite flakes having an exfoliation volume greater than 100 cm.sup.3 /g.
Dependencies are inferred from the claim text.