Surface and Interface Analysis of LiCoO2 and LiPON Thin Films by Photoemission: Implications for Li-Ion Batteries

René Hausbrand 1 , André Schwöbel 1 , Wolfram Jaegermann 1 , Markus Motzko 1 ,  and David Ensling 2
  • 1 Department of Materials Science, Darmstadt University of Technology, Jovanka-Bontschits-Str. 2, 64287 Darmstadt, Germany
  • 2 VARTA Microbattery GmbH Daimlerstr. 1, 73479 Ellwangen, Germany

Abstract

Thin film technology is applied in different fields of Li-ion battery research and development, such as the fabrication of thin film cells and model electrodes. Data obtained by surface and interface analysis of thin films provides important insights into fundamental processes such as charge compensation mechanism or interface formation. In this overview, we present the analysis of LiCoO2 and LiPON thin films using photoemission. It includes data obtained directly after preparation, after exposure to molecular species and/or after electrode-electrolyte interface formation. Information both on electronic structure and surface chemistry of the films is deduced from core level spectra, valence band spectra, Fermi level position and work function. Next to PES analysis of our films, we address composition, structure and functionality in more general terms in relation to literature.

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Founded in 1887, the Zeitschrift für Physikalische Chemie covers the main developments in physical chemistry, placing with an emphasis on experimental research. It represents a combination ofdiscusses reaction kinetics and spectroscopy, surface research and electrochemistry, thermodynamics and the structure analysis of matter in its various conditions, among other topics.

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