Nowadays, one of the main problems for a production of solid state batteries is the development of low cost electrolytes combined with longer cycle life. Research on new materials is growing to solve this problem. An example is the research on the processing of ceramic materials for use as electrolyte in Lithium-Air batteries, due to this kind of material has a good thermal and chemical stability (compared to liquid electrolytes), high ionic conductivity, ease of conformation and suppresses the risk of leaks and explosions [1,2]. Among these nanostructured ceramic electrolytes, Li7La3Zr2O12 (LLZ) stands out for its high stability and low environmental impact and still presents an ionic conductivity of approximately 10-4 S.cm-1 at room temperature and a wide range of electrochemical potential [3]. In this work the salt of the interest ions (Li, La and Zr) were mixed stoichiometrically, dissolved in distilled water (containing 10% of ethanol) and the synthesis of LLZ-powder was conducted via Spray Pyrolysis [4] at temperatures from 700 up to 950 °C, with 3 L/min of flow rate of carrier gas. After the ceramic powder was collected, it was followed by the morphological and structural characterization. The peaks obtained after X-ray diffraction (XRD) analysis indicated the formation of LLZ-cubic crystalline phase when the synthesis was carried out at 850 °C. The Particle Size Analyzer indicated an agglomerated particle size of approximately 3 ?m and using a scanning electron microscope of high resolution (SEM_FEG) it was observed that the LLZ-nanoparticles has average size below 100 nm.

References

[1] Kumazaki, S., et al. / Electrochemistry Communications 13 (2011) 509–512. [2] Murugan, R., Thangadurai, V., Weppner, W. Chem. In. Ed. 46 (2007) 77-78. [3] Langer, F., et al. / Journal of Alloys and Compounds 645 (2015) 64–69. [4] M. Gaudon, E. Djurado, N.H. Menzler. Ceramics International 30 (2004) 2295-2303.