Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 6: Functional Materials I: Battery Materials

MM 6.2: Talk

Monday, March 16, 2015, 10:30–10:45, TC 010

Electrically-induced interface reactions in lithium ion batteries — •Frank Berkemeier and Fabian Inkmann — Universität Münster, Institut für Materialphysik, Wilhelm-Klemm-Str. 10, 48149 Münster

An unconventional type of thin film lithium ion battery will be presented, which consists of a lithium phosphorous oxynitride (LiPON) thin film that is embedded between a silver and a platinum layer. All layers are prepared by sputter deposition, resulting in a triple layer stack of a thickness well below 1 µm.

We demonstrate that it is possible to trigger an electrochemical reaction between LiPON and silver, when applying a negative voltage of about -3.8 V to the silver electrode. This interface reaction causes the growth of an interface reaction layer, which is capable to reversibly intercalate/deintercalate lithium.

To understand the properties of this layer in more detail, the structural and electrochemical properties of the overall layer stacks before and after electrochemical treatment have been investigated by e.g. impedance spectroscopy, cyclic voltammetry, and transmission electron microscopy. In course of these experiments it has been found that the cells exhibit a well-defined charge/discharge behavior and a promising cycling stability. Moreover, detailed informations about the morphology of the reaction layer have been obtained, as well as data about its growth kinetics and its lithium storage capacity.