1. Science Institute and Faculty of Physical Sciences, University of Iceland, VR-III, Hjarodarhagi 2, 107 Reykjavík, Iceland
2. Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany
3. Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, Helmholtz-Strasse 16, 89081 Ulm, Germany
4. Karlsruhe Institute of Technology (KIT), P.O. Box
3640, 76021 Karlsruhe, Germany