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Iron Oxides as Anodic Materials in Li Rechargeable Batteries

Published online by Cambridge University Press:  10 February 2011

M. J. Duncan  and
L. F. Nazar
M. J. Duncan
Affiliation:
University of Waterloo, Department of Chemistry, Waterloo, Ontario, CANADAN2L 3G1
L. F. Nazar
Affiliation:
University of Waterloo, Department of Chemistry, Waterloo, Ontario, CANADAN2L 3G1lfnazar@ uwaterloo.ca
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Abstract

The open framework material, CaFe204 and the isostructural solid solution phases, LiyCa1−(x+y)/2SnxFe2−xO4, where 0<y<x and O<x<0.6 have been evaluated as promising anodic materials in Li-ion batteries. These materials can be discharged to low potential, the end member CaFe2O4 attaining a discharge capacity of 800 mAh/g at a cutoff voltage of 50 mV. The capacity is enhanced on substitution of Fe3+, for Sn4+ in the framework (920 mAh/g for the composition, Li0.6Ca0.4Sn0.6Fe1.404). On introducing Sn into the structure the reversible capacity is also substantially increased compared with the parent material. Although there is a large irreversible component to the redox process during first discharge-charge, the materials can sustain a stable reversible capacity of >600 mAh/g within the voltage window of 3.0-0.005 V. The profile of the electronic density plots suggest there is no phase separation to Li/Sn alloy phases on reduction, but rather a lithium-rich, oxygen deficient Sn/Fe/oxide matrix is formed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 71
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

1. Besenhard, J.O., Komenda, P., Paxinos, A., Wudy, E. and Josowicz, M. Solid State Ionics 18, 823 (1986).Google Scholar
2. lodata, Y., Kubota, T., Matsufuji, A., Maekawa, Y., and Miyasaka, T. Science, 276, 1395 (1997).Google Scholar
3. Courtney, I.A. and Dahn, J.R. J. Electrochem. Soc., 144, 2045 (1997).Google Scholar
4. Sigala, C., Guyomard, D., Piffard, Y., and Tournoux, M. C.R. Acad.Sci.Paris. 320, 523 (1995).Google Scholar
5. Denis, S., Baudrin, E., Touboul, M., and Tarascon, J-M. J. Electrochem. Soc 144, 4099 (1997).Google Scholar
6. Leroux, F., Goward, G.R., Power, W.P., and Nazar, L.F. Electrochem. Solid-State Lett. 1, 255, (1998).Google Scholar
7. Archaimbault, F., Odier, P., and Choisnet, J. Solid State lonics, 28–30, 1357 (1988).Google Scholar