1. Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, Helmholtzstr. 11, D-89081 Ulm, Germany
2. Karlsruhe Institute of Technology (KIT), P.O. Box
3640, D-76021 Karlsruhe, Germany
3. Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, D-89081 Ulm, Germany