Synthesis of Nanoscale Li7La3Zr2O12 Solid State Electrolyte By Spray Drying

Tuesday, 3 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
M. J. Uddin (Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University), A. R. Letfullina (Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro), P. K. Alaboina, J. S. Cho, and S. J. Cho (Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University)
To enable the futuristic applications of Li-ion batteries, significant boost in energy density and tremendous improvement in safety is required. Ceramic solid state electrolytes (SSE) with fast Li-ion diffusion are a promising class of materials that can potentially change the scenario because of their superior thermal and chemical stabilities and a wider operational temperature window. Among the numerous different solid-state oxide materials, Li7La3Zr2O12(LLZO) has gained significant interest due to its high ionic conductivity, good compatibility with lithium metal and stability in air. The preparation of LLZO is mostly based on the conventional solid state syntheses or sol-gel method, in which powders are calcined usually at temperatures above 850 °C. These current synthesis routes generally require higher calcination temperatures and longer heating duration.

In this work, we have reported spray-dried LLZO particles for the first time via a low-temperature calcination. Spray drying has allowed us to achieve a nanoporous LLZO precursor which was later calcined only at 450 °C for 4 hours to obtain the LLZO particles. The nanoporous spray-dried particles have aided in the sintering process because of higher surface energy, and thus has significantly reduced the calcination time and temperature. LLZO Pellets were prepared for further physical-chemical characterization. Electrochemical performance evaluation is also in order.