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submitted on 27.01.2020 and posted on 28.01.2020by Martin R. Busche, Thomas Leichtweiss, Carsten Fiedler, Thomas Drossel, Matthias Geiss, Manuel Weiß, Achim Kronenberger, Dominik A. Weber, Jürgen Janek
Most electrochemical energy storages (battery cells) consist of solid electrodes separated by a liquid electrolyte (LE). If electrode materials are – at least partially – soluble in the electrolyte, detrimental mass transport between both electrodes (electrode cross-talk) occurs. The shuttle mechanism in lithium-sulfur batteries or leaching of Mn in high voltage cathode materials are important examples. Implementing a solid electrolyte (SE) membrane between the electrodes is a comprehensible approach to suppress undesired mass transport but additional resistances arise due to charge transport across the SE and charge transfer through the solid/liquid electrolyte interfaces. The latter contribution is often overlooked as its determination is challenging, however, these interface properties are crucial for practical application. In previous work a resistive solid-/liquid-electrolyte interphase “SLEI” was found at the interface between the SE lithium aluminum germanium phosphate (LAGP) in contact with a liquid ether-based electrolyte. Here we aim for deeper insight into this interphase formation, referring to a lithium ion conducting glass ceramic (NASICON-type) and the commonly used thin film ion conductor “LiPON” (lithium phosphorous oxide nitride). The growth of the SLEI is monitored by a combination of electrochemical characterization, XPS (x-ray photoelectron spectroscopy) and time-of flight secondary ion mass spectrometry (ToF-SIMS).