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Method of preparation of carbon materials for use as electrodes in rechargeable batteries

United States Patent

5,882,621
March 16, 1999
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method of producing carbon materials for use as electrodes in rechargeable batteries. Electrodes prepared from these carbon materials exhibit intercalation efficiencies of .apprxeq.80% for lithium, low irreversible loss of lithium, long cycle life, are capable of sustaining a high rates of discharge and are cheap and easy to manufacture. The method comprises a novel two-step stabilization process in which polymeric precursor materials are stabilized by first heating in an inert atmosphere and subsequently heating in air. During the stabilization process, the polymeric precursor material can be agitated to reduce particle fusion and promote mass transfer of oxygen and water vapor. The stabilized, polymeric precursor materials can then be converted to a synthetic carbon, suitable for fabricating electrodes for use in rechargeable batteries, by heating to a high temperature in a flowing inert atmosphere.
Doddapaneni; Narayan (Alburquerque, NM), Wang; James C. F. (Livermore, CA), Crocker; Robert W. (Fremont, CA), Ingersoll; David (Alburquerque, NM), Firsich; David W. (Dayton, OH)
Sandia Corporation (Albuquerque, NM)
08/ 853,971
May 9, 1997
STATEMENT OF GOVERNMENT INTEREST The government has rights in this invention pursuant to contract no. DE-AC04-94AL8500 between the U.S. Department of Energy and Sandia Corporation.