Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Functional Materials III - Li ion batteries
MM 14.2: Vortrag
Montag, 31. März 2014, 16:00–16:15, IFW A
The electrocapillary coupling in aprotic lithium electrolytes — •Tobias Kitzler1, Jürgen Markmann1,2, and Jörg Weißmüller1,2 — 1Helmholtz-Zentrum Geesthacht — 2Technische Universität Hamburg-Harburg
During lithium loading and unloading into metal anodes, the electrodes undergo considerable volume change. Whenever there are gradients in composition, the volume change is accompanied by large internal stress. Depending on the mechanism of solution of Li into the electrode material, this results in different values for the electrocapillary coupling parameter (ECCP), which is here a change of apparent surface stress with apparent surface charge density and can be measured using the identity with change of electrode potential with elastic strain. Therefore the potential dependent ECCP can be used to analyse the Lithium solution mechanisms. In this talk, we present experimental results for the ECCP of a thin film gold electrode which was measured from the potential modulation when the electrode was cyclically strained in-situ during lithiation. We show supporting in-situ x-ray lattice parameter data, also measured on the films in-situ during lithiation. The underlying microscopic processes are discussed in relation to the observed ECCP.