Determination of the temperature-dependent ionic conductivity of ceramic solid electrolytes

With further progress in improving lithium ion batteries, the focus of research has turned to alternative technologies (next-generation batteries) like all-solid-state-batteries (ASSB), since these systems have the potential to exceed current battery systems in terms of energy density as well as safety concerns.

For commercial use of ASSBs, it is crucial to use highly ionically conductive solid electrolytes while simultaneously ensuring proper interfacial contact and stability. During the last years, very promising solid electrolyte candidates based on oxide-type ceramics have been synthesized and investigated, showing ionic conductivities in the range of 0.1 to 1 mS cm^-1 at room temperature. Oxide ceramic based solid electrolytes were recently also used as component of hybrid electrolytes.

Given this background, in this application note we want to focus on showing how to measure the temperature-dependent conductivity of a garnet-type Li₇La₃Zr₂O₁₂ (LLZO) sample by use of our Microcell HC system equipped with a TSC battery standard cell. The measurements were conducted in cooperation with the Fraunhofer Institute for Ceramic Technologies and Systems IKTS.