Untersuchung der Eignung von Nanopartikel-verstärkter Raman-Spektroskopie zur Charakterisierung der Festelektrolyt-Interphase in Batterien

In this thesis the chemical composition of the solid-electrolyte interphase (SEI) on glassy carbon electrodes is measured using shell-isolated nanoparticle enhanced Raman spectroscopy (SHINERS) and electrochemical impedance spectroscopy. To this end, the information gained from SHINER spectra is examined by investigating the desorption of pyridine at a silver surface. The desorption of pyridine at a silver surface is already well known, which allows to compare the measured electrochemical and spectroscopic data with the literature. This investigation shows which information about electrochemical systems can be gained reliably. Because of a drop in SHINER intensity with increasing negative potentials, the spectra were corrected. However this correction does not result in proving the desorption of pyridine by SHINERS. In regard of the gained insight in SHINERS, the composition of the SEI was investigated. Only the Raman peak positions were taken into account. The SEI was formed both via cyclic voltammetry and galvanostatic experiments. The chemical composition of the SEI was identified using spectroscopic measurements and comparison with literature. It was shown that even after formation the composition varies significantly. Additionally, a declining enhancement factor of the nanoparticles was observed, which negatively influences the measurements.