[1] Karlsruhe Inst Technol, Inst Thermal Proc Engn, Kaiserstr 12, D-76131 Karlsruhe, Germany
[2] Karlsruhe Inst Technol, Inst Funct Interfaces, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[3] Karlsruhe Inst Technol, Inst Appl Mat Energy Storage Syst, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany