1. Department of Battery Technology, Institute for Energy Technology, Instituttveien 18, NO-2027 Kjeller, Norway
2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, Alfred Getz vei 2, NO-7491 Trondheim, Norway
3. Center for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0371 Oslo, Norway