The effects of calcination parameters of garnet-type ALLZTO solid electrolyte powders on the deposition of thick films via powder aerosol deposition (PAD) method

Titelangaben

Sozak, Mutlucan ; Hennerici, Lukas ; Paulus, Daniel ; Kita, Jaroslaw ; Moos, Ralf:
The effects of calcination parameters of garnet-type ALLZTO solid electrolyte powders on the deposition of thick films via powder aerosol deposition (PAD) method.
2023
Veranstaltung: 98. DKG-Jahrestagung , 27.03.-30.03.2023 , Jena.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )

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Abstract

To realize the All-Solid-State Battery (ASSB) future solid electrolytes (SE) play a crucial role on removing the safety concerns due to their chemical stability and exhibiting high total conductivity at room temperature (RT). The crystal phase is one of the main aspects that determines the total conductivity of a SE at RT. The Al and Ta dopants in garnet-type LLZO stabilize the type cubic phase, which provides higher conductivity in LLZO. Therefore, ALLZTO stands out as a promising SE in prospective industrial applications of ASSBs regarding to its properties mentioned above. Ceramic powders in the desired composition can be directly deposited on a wide variety of substrate materials at room temperature via the powder aerosol deposition (PAD) method and dense films in the μmrange are obtained in several minutes. As the deposition depend on process parameters (carrier gas, flow rate, scan speed etc.), starting powder properties (e.g. particle size distribution, and crystallite size) also have to be suitable for a successful deposition. In this work, we synthesized ALLZTO SE powders by the mixed oxide technique. The steps in the calcination process have been modified to obtain highly pure cubic phase in the structure. XRD/Rietveld and particle size distribution analyses were carried out on the calcined powders and the effects of starting powder properties on the PAD process were demonstrated. Electrochemical properties of SE thick films were determined and correlated with the purity of starting powders. The current work shows a successful deposition of cubic ALLZTO powders on various substrates. This is promising for both the industrialization of the PAD method and the utilization of ALLZTO powders in ASSB technology.