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OPTIMIZATION OF CARBON COATINGS

United States Patent Application

20090183650
A1
View the Complete Application at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
Several synthetic additives have been used to improve the carbon coatings on LiFePO4 electrode materials. Pyromellitic acid (PA) added prior to calcination decreases the D/G ratios of the carbon produced in situ, while the use of both iron nitrate and PA results in increased sp.sup.2 character. Thus, the carbon coatings are structured with a greater fraction of graphitic character. The production of structured carbon coatings results in higher pressed pellet conductivities of LiFePO.sub.4/C composites and improved electrochemical performance of cells containing these cathode materials, although the carbon content is not necessarily increased. The combination of both ferrocene and PA used during LiFePO.sub.4 synthesis causes more carbon to be retained, although the structural characteristics are similar to that produced from the same amount of PA alone.
Doeff, Marca M. (Hayward, CA), Wilcox, James D. (Berkeley, CA), Kostecki, Robert (Lafayette, CA), Lau, Grace Y. (Fremont, CA)
The Regents of the University of California (Oakland CA)
12/ 302,476
June 12, 2007
STATEMENT OF GOVERNMENTAL SUPPORT [0002] The invention described and claimed herein was made in part utilizing funds supplied by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and in part utilizing funds provided by DARPA grant HR0011-04-1-0029. The Government has certain rights in this invention.