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Carbon Materials Embedded with Metal Nanoparticles as Anode in Lithium-Ion BatteriesCarbon materials containing metal nanoparticles that can form an alloy with lithium were tested for their capacity and cycle life to store and release lithium electrochemically. Metal nanoparticles may provide the additional lithium storage capacity as well as additional channels to conduct lithium in carbon. The cycle life of this carbon-metal composite can be long because the solid-electrolyte interface (SEI) on the carbon surface may protect both lithium and the metal particles in the carbon interior. In addition, the voids in the carbon interior may accommodate the nanoparticle's volume change, and such volume change may not cause much internal stress due to small sizes of the nanoparticles. This concept of improving carbon's performance to store and release lithium was demonstrated using experimental cells of C(Pd)/0.5M Lil-50/50 (vol.%) EC and DMC/Li, where C(Pd) was graphitized carbon fibers containing palladium nanoparticles, EC was ethylene carbonate, and DMC was dimethyl carbonate. However, such improvement was not observed if the Pd nanoparticles are replaced by aluminum, possibly because the aluminum nanoparticles were oxidized in air during storage, resulting in an inert oxide of aluminum. Further studies are needed to use this concept for practical applications.
Document ID
20020038743
Document Type
Technical Memorandum (TM)
Authors
Hung, Ching-cheh (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Chemistry and Materials (General)
Report/Patent Number
NASA/TM-2002-211312
E-13115
NAS 1.15:211312
Meeting Information
Carbon Conference 2001(Lexington, KY)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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