1. Institute of Materials École Polytechnique Fédérale de Lausanne (EPFL), EPFL-STI-IMX-LMOM, MXG 135 Station 12 1015 Lausanne Switzerland
2. Institute of Condensed Matter Physics École Polytechnique Fédérale de Lausanne (EPFL), EPFL-PH J0 491 Station 3 1015 Lausanne Switzerland
3. Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne (EPFL), EPFL-BCH 2111, Batochime UNIL Avenue Forel 2 1015 Lausanne Switzerland
4. Crystallography and Structural Physics University of Erlangen-Nürnberg Staudtstrasse 3 91058 Erlangen Germany
5. Present address: Department Chemie Universität Paderborn Warburger Strasse 100 33098 Paderborn Germany
6. European Synchrotron Radiation Facility (ESRF) 6 rue Jules Horowitz, BP220 38043 Grenoble Cedex France
7. Institut Charles Sadron CNRS Université de Strasbourg Rue du Loess 23 67034 Strasbourg France
8. Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne (EPFL), EPFL-BCH 5312, Batochime UNIL Avenue Forel 2 1015 Lausanne Switzerland
9. present address: Department of Energy Conversion and Storage Technical University of Denmark Anker Engelunds Vej 301 2800 Kongens Lyngby Denmark