1. Department for Electrochemical Energy Storage, Helmholtz Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
2. Department of Physics & IRIS Adlershof, Humboldt-Universitätzu zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
3. Institute of Chemistry, University of Potsdam, 14467 Potsdam, Germany
4. Institute of Physics and Astronomy, University of Potsdam, 14467 Potsdam, Germany