1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague 8, Czech Republic, High Power Lithium, Park Scientifique, PSE-B, EPFL, Ecublens, CH-1015 Lausanne, Switzerland, SusTech GmbH & Co. KG, Petersenstr. 20, D-64287 Darmstadt, Germany, Laboratory of Inorganic Chemistry, ETHZ, Wolfgang-Pauli-Str. 10, CH-8093 Zürich, Switzerland, and Laboratory of Photonics and Interfaces, EPFL, Ecublens, CH-1015 Lausanne, Switzerland