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On the Electrochemical Properties of α-Li3FeF6 Prepared by Precipitation from Aqueous-Alcohol Based Solutions

Published online by Cambridge University Press:  04 April 2011

A. Basa ,
E. Gonzalo ,
A. Kuhn  and
F. García-Alvarado
A. Basa
Affiliation:
Dpto. Química, Univ San Pablo CEU, Boadilla del Monte, E-28668, Madrid. SPAIN. Institute of Chemistry, University of Białystok, Hurtowa St. 1, 15-399 Białystok, POLAND.
E. Gonzalo
Affiliation:
Dpto. Química, Univ San Pablo CEU, Boadilla del Monte, E-28668, Madrid. SPAIN.
A. Kuhn
Affiliation:
Dpto. Química, Univ San Pablo CEU, Boadilla del Monte, E-28668, Madrid. SPAIN.
F. García-Alvarado
Affiliation:
Dpto. Química, Univ San Pablo CEU, Boadilla del Monte, E-28668, Madrid. SPAIN.
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Abstract

The α-polymorph of Li3FeF6 has been prepared from aqueous-based solution by precipitation under different conditions to obtain small particles. Several alcohols have been used to vary the precipitation media. Among them 2-propanol has been found to provide particles of about 100 nm under controlled conditions of temperature and H2O: R-OH volume ratio. The average particle size of some of the as-prepared samples is smaller than that obtained for those samples obtained by precipitation in water. However, the expected enhancement of electrochemical performances does not occur for the as-prepared samples. Inserted amount of lithium into the cryolite structure of Li3FeF6 increases significantly only when composites of asprepared Li3FeF6 and carbon are milled mechanically. For example 12h milling is needed to reach 64 mAh/g (45% of theoretical capacity).

Keywords

chemical synthesisintercalationenergetic material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1313: Symposium KK – Materials for Advanced Lithium Batteries , 2011 , mrsf10-1313-kk09-14
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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