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Article

Spray Flame Synthesis (SFS) of Lithium Lanthanum Zirconate (LLZO) Solid Electrolyte

1
IVG, Institute for Combustion and Gas Dynamics—Reactive Fluids, University of Duisburg-Essen, 47057 Duisburg, Germany
2
CENIDE, Center for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Alfons Baiker
Materials 2021, 14(13), 3472; https://doi.org/10.3390/ma14133472
Received: 22 April 2021 / Revised: 10 June 2021 / Accepted: 17 June 2021 / Published: 22 June 2021
(This article belongs to the Special Issue Flame Synthesis and Characterization of Oxide Nanoparticles)
A spray-flame reaction step followed by a short 1-h sintering step under O2 atmosphere was used to synthesize nanocrystalline cubic Al-doped Li7La3Zr2O12 (LLZO). The as-synthesized nanoparticles from spray-flame synthesis consisted of the crystalline La2Zr2O7 (LZO) pyrochlore phase while Li was present on the nanoparticles’ surface as amorphous carbonate. However, a short annealing step was sufficient to obtain phase pure cubic LLZO. To investigate whether the initial mixing of all cations is mandatory for synthesizing nanoparticulate cubic LLZO, we also synthesized Li free LZO and subsequently added different solid Li precursors before the annealing step. The resulting materials were all tetragonal LLZO (I41/acd) instead of the intended cubic phase, suggesting that an intimate intermixing of the Li precursor during the spray-flame synthesis is mandatory to form a nanoscale product. Based on these results, we propose a model to describe the spray-flame based synthesis process, considering the precipitation of LZO and the subsequent condensation of lithium carbonate on the particles’ surface. View Full-Text
Keywords: spray-flame reactor; solid electrolyte; Garnet (Li7La3Zr2O12); nanoparticles; Li-precursor spray-flame reactor; solid electrolyte; Garnet (Li7La3Zr2O12); nanoparticles; Li-precursor
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MDPI and ACS Style

Ali, M.Y.; Orthner, H.; Wiggers, H. Spray Flame Synthesis (SFS) of Lithium Lanthanum Zirconate (LLZO) Solid Electrolyte. Materials 2021, 14, 3472. https://doi.org/10.3390/ma14133472

AMA Style

Ali MY, Orthner H, Wiggers H. Spray Flame Synthesis (SFS) of Lithium Lanthanum Zirconate (LLZO) Solid Electrolyte. Materials. 2021; 14(13):3472. https://doi.org/10.3390/ma14133472

Chicago/Turabian Style

Ali, Md Yusuf, Hans Orthner, and Hartmut Wiggers. 2021. "Spray Flame Synthesis (SFS) of Lithium Lanthanum Zirconate (LLZO) Solid Electrolyte" Materials 14, no. 13: 3472. https://doi.org/10.3390/ma14133472

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