INFIQC 05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Comparative Study of Different Alkali (Na, Li) Titanate Substrates as Active Materials for Anodes of Lithium - Ion Batteries
Autor/es:
S. CHAUQUE; C. ROBLEDO; E.P.M. LEIVA; F. OLIVA; O.R. CÁMARA
Revista:
ECS Transactions
Editorial:
The Electrochemical Society
Referencias:
Año: 2014 vol. 63 p. 113 - 128
ISSN:
1938-6737
Resumen:
The relationship between structure and lithium storage capacity of different titanate samples as anode materials for lithium-ion batteries is discussed. Li4Ti5O12, Na2Ti3O7 and Na2Ti6O13 were synthesized by solid-state reaction. The structure, surface and morphology of the samples were characterized by SEM, XRD and RAMAN spectroscopy. The electrochemical performance was studied by galvanostatic charge-discharge cycling, cyclic voltammetry, electrochemical impedance spectroscopy and rate capability. The lithium titanate presented the highest capacity of the three electrodes, together with the most reversible potential plateau at 1.6 V vs. Li+/Li and the best response in rate capability. Apparent diffusion coefficients of Li+ ions into the titanate matrices were obtained, showing the highest value for the lithium titanate compound. Between both sodium titanates, Na2Ti6O13 presented the highest specific capacity and the best discharge retention.
