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New Iron (III) Hydroxyl-Phosphate with Rod-packing Structure as Intercalation Materials

Published online by Cambridge University Press:  11 February 2011

Yanning Song ,
Peter Y. Zavalij  and
M. Stanley Whittingham
Yanning Song
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902–6016
Peter Y. Zavalij
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902–6016
M. Stanley Whittingham
Affiliation:
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902–6016
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Abstract

A new iron hydroxyl-phosphate, H2Fe14/3(PO4)4(OH)4 has been synthesized under hydrothermal conditions. In this compound, perpendicular chains formed by the face-sharing FeO6 form rod-packing structure. Only about 60% of the chain sites are occupied by iron atoms; other metals, such as manganese, nickel, zinc, can be incorporated into the chain either by filling in the vacancies and/or replacing some of the iron atoms. Reversible insertion and extraction of lithium into this compound shows it to be an excellent cathode material. At current density of 0.1 mA/cm2, 90 % of the theoretical capacity (176 mAh/g) can be obtained. The utilization was reduced to about 70 % on a ten-fold increase of current density. The electrochemical behavior is attributed to the 3-dimensional rod packing structure, where lithium can move freely even at high current densities inside the 3-dimensional framework without altering the host structure. Two of the protons in the lattice may be exchanged by lithium giving Li2Fe14/3(PO4)4(OH)4. These lithium atoms are not removable in electrochemical cycling and similar electrochemical property was found for these two compounds, suggesting an ion-exchange process for the lithiation.

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 , EE7.7
Copyright
Copyright © Materials Research Society 2003

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References

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