Artículos de revistas
Comparative Study of Different Alkali (Na, Li) Titanate Substrates as Active Materials for Anodes of Lithium - Ion Batteries
Fecha
2014-08Registro en:
Oliva, Fabiana Yolanda; Leiva, Ezequiel Pedro M.; Robledo, Carla Belén; Chauque, Susana; Camara, Osvaldo Raul; Comparative Study of Different Alkali (Na, Li) Titanate Substrates as Active Materials for Anodes of Lithium - Ion Batteries; Electrochemical Society; ECS Transactions; 63; 1; 8-2014; 113-128
1938-6737
CONICET Digital
CONICET
Autor
Chauque, Susana
Robledo, Carla Belén
Leiva, Ezequiel Pedro M.
Oliva, Fabiana Yolanda
Camara, Osvaldo Raul
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.