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Next Generation Positive Electrode Materials Enabled by Nanocomposites: -Metal Fluorides-

Published online by Cambridge University Press:  11 February 2011

F. Badway ,
N. Pereira ,
F. Cosandey  and
G. G. Amatucci
F. Badway
Affiliation:
Telcordia Technologies, Red Bank, NJ 07701, USA
N. Pereira
Affiliation:
Telcordia Technologies, Red Bank, NJ 07701, USA Rutgers University, Piscataway, NJ 08855, USA
F. Cosandey
Affiliation:
Rutgers University, Piscataway, NJ 08855, USA
G. G. Amatucci
Affiliation:
Telcordia Technologies, Red Bank, NJ 07701, USA
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Abstract

Through the use of nanostructures and nanocomposites, the electrochemical activity of metal fluoride materials was opened as potential candidates as next generation high energy density positive electrodes for Li batteries. This class of materials, utilizing FeF3 as an example, is shown to exhibit good reversible behavior of approximately 200 mAh/g in the 3V region. The specific capacity is extended to 600 mAh/g when the discharge is extended to take into account the additional specific capacity associated with a 2V plateau. Through the use of XRD, SAED and high resolution TEM, the 2V reaction mechanism was associated to a reversible metal fluoride conversion mechanism. It is shown that LiF + Fe nanocomposite can be utilized as initial components in order to make the technology suitable for Li-ion applications. Although exhibiting relatively poor rate capabilities at this initial stage, reversible conversion metal fluorides enable for the first time the utilization of all the redox states of the constituent metal in a reversible manner in the positive electrode. This translates to 4X the specific capacity and double the energy density of today's state of the art LiCoO2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE7.1
Copyright
Copyright © Materials Research Society 2003

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References

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