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A Structural and Electrochemical Study of Li2Ti6O13

Published online by Cambridge University Press:  13 September 2011

J. C. Pérez-Flores ,
A. Kuhn  and
F. García-Alvarado
J. C. Pérez-Flores
Affiliation:
Universidad San Pablo CEU, Departamento de Química. E-28668, Boadilla del Monte, Madrid, SPAIN
A. Kuhn
Affiliation:
Universidad San Pablo CEU, Departamento de Química. E-28668, Boadilla del Monte, Madrid, SPAIN
F. García-Alvarado
Affiliation:
Universidad San Pablo CEU, Departamento de Química. E-28668, Boadilla del Monte, Madrid, SPAIN
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Abstract

The lithium titanate Li2Ti6O13 has been prepared from Na2Ti6O13 by Li ion exchange in molten LiNO3 at 325ºC. Chemical analysis and powder X-ray diffraction study of the reaction product, respectively, indicate that total Na/Li exchange takes place and the Ti-O framework of the Na2Ti6O13 parent structure is kept under those experimental conditions. The electrochemical characterization shows that Li2Ti6O13 is able to insert ca. 5 Li per formula unit under equilibrium conditions in the voltage range 1.5-1.0 V vs. Li+/Li. This corresponds to a specific discharge capacity of 250 mAh g-1. Lithium insertion occurs at an average equilibrium voltage of 1.5 V which is typical for oxides and titanates where Ti(IV)/Ti(III) is the active redox couple. After the first redox cycle a high reversible capacity is obtained (ca. 160 mAh g-1 at C/12, with a 70% capacity retention related to a phase transformation upon cycling). On the basis of these results, we are proposing Li2Ti6O13 as new lithium battery anode material to be further investigated.

Keywords

intercalationion-exchange materialenergetic material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1313: Symposium KK – Materials for Advanced Lithium Batteries , 2011 , mrsf10-1313-kk05-09
Copyright
Copyright © Materials Research Society 2011

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References

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