Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Focus Session: Nanoscale Insights into Interfacial Electrochemistry II
O 71.6: Vortrag
Mittwoch, 14. März 2018, 17:00–17:15, HE 101
Nanoscale monitoring of temperature dependent lithium particle growth for solid state electrolytes — •Valon Lushta1, Sebastian Badur1, Dirk Dietzel1, Bernhard Roling2, and André Schirmeisen1 — 1Institute of Applied Physics, Justus-Liebig-University Gießen, D-35392 Gießen, Germany — 2Department of Chemistry,Philipps-University of Marburg, D-35032 Marburg, Germany
Solid-state batteries are a promising approach to safer and more reliable electrochemical energy storage. However, compared to current liquid electrolytes these materials only show a low ion conductivity. In this context, understanding ion transport processes on the nanoscale is considered crucial for the development of improved solid electrolyte systems. Here we have employed a novel approach, where nanoscopic metallic lithium particles are deposited on a solid electrolyte surface by a biased AFM tip [1,2]. To verify, that quantitative values for the local ion mobility can indeed derived by this method, we have monitored the particle volume as a function of the sample temperature for the example of a Ohara lithium ion glass ceramic. From this data the Arrhenius activation energy for ion diffusion could then be calculated and was found to be in good accordance to macroscopic reference data. Additionally, we managed to perform high resolution mapping of the ion mobility by decreasing the particle volumes to only a few 10 nm3.
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