Thick-films of garnet-type lithium ion conductor prepared by the Aerosol Deposition Method : The role of morphology and annealing treatment on the ionic conductivity

Titelangaben

Hanft, Dominik ; Exner, Jörg ; Moos, Ralf:
Thick-films of garnet-type lithium ion conductor prepared by the Aerosol Deposition Method : The role of morphology and annealing treatment on the ionic conductivity.
In: Journal of Power Sources. Bd. 361 (2017) . - S. 61-69.
ISSN 0378-7753
DOI: https://doi.org/10.1016/j.jpowsour.2017.06.061

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Abstract

We fabricated thick films of cubic garnet solid electrolyte AlyLi₇-₃y-zLa₃Zr₂-zTazO₁₂ (ALLZTO) by the Aerosol Deposition Method (ADM). Due to the room temperature impact consolidation (RTIC) mechanism, the films become dense. A thermal post-treatment of the film revealed the morphological and process-related impact on the ionic conductivity. As-deposited films show a reduced conductivity around 2·10^−7 S/cm. Using electrochemical impedance spectroscopy and high-temperature X-ray diffraction, we found the lattice distortion and nano-crystallinity of the films to be the decisive effect for the conductivity reduction. In our case, post-deposition annealing at 400 °C lead to an increase of the ionic conductivity to 2·10^−5 S/cm. With a beginning of sintering at 600 °C, the conductivity successively increased further, reaching values of 7·10^−5 S/cm.