Lithium Lanthanum NiobiumNanoparticles Synthesized by Spray Pyrolysis

Reference	Presenter	Authors (Institution)	Abstract
06-036	Leandro Conceicção	Conceicção, L.(Senai Institute Innovation of Electrochemistry); Berton, M.A.(Senai Institute Innovation of Electrochemistry); Lutosa, G.M.(Senai Institute Innovation of Electrochemistry); Franchetti, M.G.(Senai Institute Innovation of Electrochemistry); Souza, A.(Senai Institute Innovation of Electrochemistry); Rech, A.(Senai Institute Innovation of Electrochemistry); Goulart, F.(Senai Institute Innovation of Electrochemistry); Lopes, L.(Senai Institute Innovation of Electrochemistry);	The use of ceramic powders as solid electrolytes is promising to become the new generation of energy storage devices. They are safer compared with the conventional batteries, that make use of flammable organic solvents, besides having ionic conductivity in the order of 10?4?10?2 S.cm?1 and also high electrochemical stability (up to 5.5 V/Li). The lithium-based electrolytes are one of the news materials that possess high energy density, high Li conductivity and chemical stability, combined with longer cycle life, conferring the potential use in electric vehicles and others high-energy applications. In this research, Li2CO3, La(NO3)3.6H2O e NH4[NbO(C2O4)2(H2O)2] were used as starting materials for the synthesis of the ceramic electrolyte LLN via spray pyrolysis at temperatures from 600 up to 950 °C. This method consists in the nebulization of a solution containing the metallic ions of interest in stoichiometric quantities that are dragged into a tubular furnace where the formed droplets are calcined and then, at the end of the ceramic tube, are deposited on a metallic substrate through electrostatic attraction, by applying ~3 kV from the use of a high voltage source. After the synthesis step, the obtained ceramic powder was taken to the morphological and structural characterization. The X-ray diffraction allows to identify the peaks of both Li5La3Nb2O12 and LiLa2NbO6 crystalline phases. Its observed that the peaks of LiLa2NbO6 appears when its used temperature over than 700 °C, this can be associated to Li-evaporation, that impairs obtaining the desired phase of the ceramic electrolyte (Li5La3Nb2O12). Particle size analyser was used to verify the particle size distribution and it’s observed that the particle agglomerates has size around 2,83 µm. Using a scanning electron microscope of high resolution (SEM_FEG) it was observed nanoparticles with average size below 100 nm.
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