Solid-Electrolyte Garnet-type Thick-Films by Aerosol Deposition

Titelangaben

Hanft, Dominik ; Moos, Ralf:
Solid-Electrolyte Garnet-type Thick-Films by Aerosol Deposition.
2016
Veranstaltung: Bunsen-Kolloquium : Solid-State Batteries II : from Fundamentals to Application , 23.-25.11.2016 , Frankfurt, Germany.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )

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Abstract

Solid electrolyte materials for new battery systems with high specific capacity are a strong research field. Compared to other solid electrolyte systems, garnet-type materials like the here investigated Li₇La₃Zr₂O₁₂ show good conductivity while being chemically stable against elemental lithium. Additionally, the film processing technique plays an important role since it usually affects the properties of the film like mechanical stability and ionic conductivity. With respect to electrolyte films, these films need to be processed in a thickness optimum to meet both needs of a maximum mechanical stability and minimum film resistance. Furthermore, especially electrolyte films have to be processed in a dense matter to prevent safety risks from short-circuiting through dendrite formation. The Aerosol Deposition (AD) method as a unique room-temperature process has the potential to manufacture dense ceramic films in a thickness range of 2 - 100 µm. Starting from a dry initial powder, this powder is aerosolized by means of a carrier gas and accelerated in a nozzle to several hundred meters per second. Working under vacuum conditions, the aerosol jet impacts on the substrate material, where the particles fracture and form a dense and stable film. In this contribution, we show the influences of the AD processing technology to the properties of lithium ion-conducting films. As powder, we used cubic Li₇La₃Zr₂O₁₂. Resulting films were analyzed concerning morphology, crystallinity and ionic conductivity using Electrochemical Impedance Spectroscopy (EIS) and X-Ray Diffraction (XRD). We obtained homogeneous films of several micrometer thickness. We observed a correlation between the change in crystallinity and morphology of the film and the conductivity for as-deposited films.