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Synthesis, Characterization and Electrochemical Study of the Solid Solution LixNa0.875−δFe0.875Ti1.125O4 (0 ≤ δ ≤ 0.4, x ≥ 0)

Published online by Cambridge University Press:  16 February 2011

Alois Kuhn ,
F. Garcia-Alvarado ,
E. Moran  and
M.A. Alario-Franco
Alois Kuhn
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
F. Garcia-Alvarado
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
E. Moran
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
M.A. Alario-Franco
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
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Abstract

The calcium ferrite type structure of Na0.875Fe0.875Ti1.125O4[1] has double tunnels which are occupied by double rows of sodium atoms running along the b-axis. We have partially removed sodium from this compound at moderate temperatures with different oxidizing agents. Electrochemical studies show that the resulting materials, Na0.875Fe0.875Ti1.125O4 (0 ≤ δ ≤ 0.4), can reversibly intercalate lithium at potentials between 3.8 and 1 volt. At the lowest voltages, a compound containing ∼ 0.5 lithium per formula is formed. By chemical reaction of Na0.875Fe0.875Ti1.125O4 with n-butyllithium, the maximum lithium content also corresponds to Li0.5Na0.875Fe0.875Ti1.125O4. This suggests that many more than the one eighth of the empty sodium sites, per unit cell, of the parent phase are now being occupied by lithium.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 481
Copyright
Copyright © Materials Research Society 1995

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References

references

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