Synchrotron-supported study on the influence of annealing temperatures of garnet-type solid electrolyte films produced at room temperature by the powder aerosol deposition method

Title data

Schneider, Jürgen ; Lechner, Steffen ; Paulus, Daniel ; Kita, Jaroslaw ; Moos, Ralf:
Synchrotron-supported study on the influence of annealing temperatures of garnet-type solid electrolyte films produced at room temperature by the powder aerosol deposition method.
In: Open Ceramics. Vol. 27 (2026) . - 101047.
ISSN 2666-5395
DOI: https://doi.org/10.1016/j.oceram.2026.101047

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Abstract in another language

Powder aerosol deposition (PAD) is a coating technique for fabricating dense ceramic films at room temperature. Since the functional film properties are often impaired after deposition due to microstrain from the deposition process, thermal post-treatment may be required. This work presents how high-power LED annealing is suitable for increasing the electrical conductivity of PAD-Li7La3Zr2O12 (LLZO) films at room temperature from 5.7∙10⁻⁸ S·cm⁻¹ to 3.5∙10⁻⁶ S·cm⁻¹ within 60 s. Custom-built temperature sensors for in-situ measurements during LED annealing enable exact determination of annealing temperatures during exposure. Synchrotron X-ray diffraction experiments confirmed that LED- and furnace-based annealing decrease film-inherent microstrain from over 1.2 % to below 0.6 % without significant grain growth. Finally, the dependency of electrical conductivity of PAD-LLZO films on residual microstrain is evaluated. This study further proves that microstrain is responsible for (at least part of) the conductivity decrease.