1. Institute of Organic Chemistry University of Freiburg Albertstraße 21 79104 Freiburg Germany
2. MEET Battery Research Center Institute of Physical Chemistry University of Münster Corrensstr. 46 48149 Münster Germany
3. Helmholtz-Institute Münster (HI MS) IEK-12, Forschungszentrum Jülich GmbH 48149 Münster Germany
4. Current address: Institute of Organic Chemistry II and Advanced Materials Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany