Abstract
In this study, lithium thin film batteries were characterized using Electrochemical Impedance Spectroscopy (EIS) to analyze the interfaces evolution during cycling and aging. Firstly, the conception of symmetrical Pt/LiPON/Pt blocking cells shows the resistive contribution of the solid electrolyte and let us access to the ionic transport parameters such as the ionic conductivity and the dielectric constant, respectively of 2.10-6 S.cm-1 and 20. Moreover, EIS performed on fresh and aged battery highlights an increase of LiPON/Lithium interface resistivity, which may be caused by a lithium metal degradation or oxidation at the interface. This observation was confirmed by a cycle inducing the creation of a fresh LiPON/Lithium interface and a decrease of the corresponding EIS response. Further works will focus on the understanding of the origin and the evolution of each contribution thanks to impedance characterization of half-cells.
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