1. Fraunhofer R&D Center Electromobility Fraunhofer Institute for Silicate Research Neunerplatz 2 97082 Wuerzburg Germany
2. Intilion GmbH Dr.‐Sinsteden‐Strasse 8 08056 Zwickau Germany
3. Chemical Technology of Materials Synthesis Faculty of Chemistry and Pharmacy Julius‐Maximilians‐University Wuerzburg Roentgenring 11 97070 Wuerzburg Germany