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Nanocomposite Electrodes for Advanced Lithium Batteries: The LiFePO4 Cathode

Published online by Cambridge University Press:  15 March 2011

Shoufeng Yang ,
Yanning Song ,
Peter Y. Zavalij  and
M. Stanley Whittingham
Shoufeng Yang
Affiliation:
Institute for Materials Research, Binghamton University, Binghamton, NY 13902-1600, U.S.A.
Yanning Song
Affiliation:
Institute for Materials Research, Binghamton University, Binghamton, NY 13902-1600, U.S.A.
Peter Y. Zavalij
Affiliation:
Institute for Materials Research, Binghamton University, Binghamton, NY 13902-1600, U.S.A.
M. Stanley Whittingham
Affiliation:
Institute for Materials Research, Binghamton University, Binghamton, NY 13902-1600, U.S.A.
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Abstract

LiFePO4 was successfully synthesized by high temperature and hydrothermal synthesis. A nanocomposite was formed by carbon coating this material; initial electrochemical results showed that up to 70% capacity could be obtained at 1.0 mA/cm2 current density. In contrast, the hydrothermally prepared LiFePO4 showed a lower capacity even at lower discharge rates due to a partial occupation of lithium sites by iron. This occupation, identified by Rietveld X-ray refinement, decreased both the rate and degree of intercalation and de-intercalation of lithium; chemical reaction with butyl lithium and bromine confirmed the electrochemical behavior. This investigation showed that the cathode could be prepared by high temperature synthesis, followed by a carbon black coating to achieve high capacity at high current density.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V7.9
Copyright
Copyright © Materials Research Society 2002

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References

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