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Coated particles for lithium battery cathodes

United States Patent

July 18, 2017
View the Complete Patent at the US Patent & Trademark Office
Particles of cathodic materials are coated with polymer to prevent direct contact between the particles and the surrounding electrolyte. The polymers are held in place either by a) growing the polymers from initiators covalently bound to the particle, b) attachment of the already-formed polymers by covalently linking to functional groups attached to the particle, or c) electrostatic interactions resulting from incorporation of cationic or anionic groups in the polymer chain. Carbon or ceramic coatings may first be formed on the surfaces of the particles before the particles are coated with polymer. The polymer coating is both electronically and ionically conductive.
Singh; Mohit (Berkeley, CA), Eitouni; Hany Basam (Oakland, CA), Pratt; Russell Clayton (Foster City, CA), Mullin; Scott Allen (San Leandro, CA), Wang; Xiao-Liang (Fremont, CA)
Seeo, Inc. (Hayward, CA)
13/ 889,335
May 7, 2013
STATEMENT OF GOVERNMENT SUPPORT The invention described and claimed herein was made in part utilizing funds supplied by the U.S. Department of Energy under Contract No. DE-EE0005449. The Government has certain rights in this invention.