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Compacted carbon for electrochemical cells

United States Patent

5,677,082
October 14, 1997
View the Complete Patent at the US Patent & Trademark Office
This invention provides compacted carbon that is useful in the electrode of an alkali metal/carbon electrochemical cell of improved capacity selected from the group consisting of: (a) coke having the following properties: (i) an x-ray density of at least 2.00 grams per cubic centimeters, (ii) a closed porosity of no greater than 5%, and (iii) an open porosity of no greater than 47%; and (b) graphite having the following properties: (i) an x-ray density of at least 2.20 grams per cubic centimeters, (ii) a closed porosity of no greater than 5%, and (iii) an open porosity of no greater than 25%. This invention also relates to an electrode for an alkali metal/carbon electrochemical cell comprising compacted carbon as described above and a binder. This invention further provides an alkali metal/carbon electrochemical cell comprising: (a) an electrode as described above, (b) a non-aqueous electrolytic solution comprising an organic aprotic solvent and an electrolytically conductive salt and an alkali metal, and (c) a counterelectrode.
Greinke; Ronald Alfred (Medina, OH), Lewis; Irwin Charles (Strongsville, OH)
UCAR Carbon Technology Corporation (Danbury, CT)
08/ 654,644
May 29, 1996
GOVERNMENT CONTRACT The work described and claimed in this patent application was conducted under Cooperative Agreement No. DE-FCO2-91CE50336 with the Department of Energy of the United States of America.