Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.55: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Ultra thin LiPON layers as an electrolyte for solid-state thin film batteries — •Susann Nowak, Frank Berkemeier, and Guido Schmitz — Universität Münster, Institut für Materialphysik, Wilhelm-Klemm-Str. 10, 48149 Münster

Despite LiPON (lithium phosphorus oxynitride, Li₃N_x(PO₄)_1−x) is widely discussed as a suitable electrolyte for all solid-state thin film batteries, there are only a few publications reporting on films that exhibit a thickness below 1 µm. Therefore, in this work we investigate the properties of LiPON films with a thickness between 50 and 500 nm prepared by reactive ion-beam sputtering of Li₃PO₄, using argon as sputter gas and nitrogen as reactive additive and the characterization of the films by temperature-dependent electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM). Temperature dependent measurements of dc-conductivity by EIS give a conductivity of 5*10⁻⁷ S/cm at 30^∘ and an activation enthalpy of (58 ± 2) kJ/mol, and hence allow to operate the LIPON films in all-solid state batteries at room temperature, with a reasonable charge/discharge performance. Additionally, thin film batteries have been prepared by depositing a LIPON layer between two metallic electrodes (e.g. Pt and Ag), which are forming a complete electrochemical thin-film cell during the first cycle of cyclic voltammetry measurements.