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US 6,669,919 B1Granted
Intercalated graphite flakes exhibiting improved expansion characteristics and process therefor
AssigneeAdvanced Energy Technology Inc.
InventorRonald Alfred Greinke
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Abstract
A method for providing intercalated graphite flake with improved exfoliation characteristics, specifically, improved expansion pressure, is presented. The method includes treating graphite flakes with an oxidizing intercalant solution to provide intercalated graphite flakes; washing the intercalated graphite flakes; and adding a surfactant to the washed graphite flakes. The invention also includes the intercalated graphite flakes thusly prepared.
Claims15
A method for providing intercalated graphite flake with improved exfoliation characteristics, comprising:
- (i) treating graphite flakes with an oxidizing intercalant solution to provide intercalated graphite flakes;
- (ii) washing the intercalated graphite flakes;
- (iii) adding a surfactant to the washed graphite flakes;
- and (iv) exposing the graphite flakes to an expansion aid applied prior to, during or immediately after treatment with the oxidizing intercalant solution, wherein said expansion aid is selected from the group consisting of carboxylic acids consisting of carbon, hydrogen, and oxygen atoms;
- alkyl esters;
- naphthoic acids;
- anthranilic acid;
- p-aminobenzoic acid;
- acetoacetoamidobenzoic acids;
- acetamidobenzoic acids;
- anhydrides of the aforementioned acids;
- and mixtures thereof.
9 more elements
Dependencies are inferred from the claim text.