1. Battery
and Electrochemistry Laboratory, Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2. BASF SE, 67056 Ludwigshafen, Germany
3. Institute
of Physical Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring
58, 35392 Giessen, Germany