In this work, the synthesis of Li3xLa2/3-xTiO3 oxide is studied by thermal decomposition of citrate precursor at very low temperature which has not been yet reported in the literature for these compounds. The characterization of oxides and its precursor was realized by DRX, IR, ATD and TEM techniques. The results show the formation of a new chemical compound (precursor) as well as several advantages of the citrate method in relation to reported ones in the literature: the ostensible decreasing of temperature Li3xLa2/3-xTiO3 formation and the decreasing of particle size on the nanometric scale which is very desirable for the electrochemical application.
El perfeccionamiento de los dispositivos de almacenamiento de energía es una de las principales líneas de investigación en la actualidad. En este trabajo se realiza un estudio experimental de materiales relacionados con la construcción de baterías sólidas de litio. Para estos fines se sintetizó el óxido mixto La 0.43 Ce 0.1 Li 0.30 TiO 3 empleando el método cerámico. La caracterización estructural se realizó por la técnica de difracción de rayos X. Para la caracterización eléctrica del material La 0.43 Ce 0.1 Li 0.30 TiO 3 se utilizó la técnica de Polarización Eléctrica en Estado Sólido y el cálculo del coeficiente Seebeck. Las muestras presentan estructura cristalina tipo perovskita, con grupo espacial Pmmm. Las medidas eléctricas demuestran conducción iónica de litio y ausencia de conductividad electrónica.Palabras clave: Conductores iónicos de litio, coeficientes Seebeck, perovskitas, baterías de litio.
Recepción: 17-05-2012Aceptación: 07-09-2012
AbstractThe improvement of storing energy devices is an important subject in present days. This paper deals with materials that potentially could be employed as solid electrolytes in secondary lithium batteries. The complex oxide La 0.43 Ce 0.1 Li 0.30 TiO 3 was prepared by a ceramic method. The structural characterization was carried out by X ray powder diffraction and electric properties were analyzed by Electric Polarization in Solid State technique and the Seebeck coefficient calculus. The obtained solids have orthorhombic perovskite-like crystalline structure and they are ionic conductors of lithium ion whereas electronic conduction is absent.
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