1. Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, Helmholtzstraße 11, Ulm, D-89081 Baden-Württemberg, Germany
2. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, D-76344 Baden-Württemberg, Germany