Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.52: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Analysis of electrochemically inserted Lithium in metal electrodes — •Philipp Bach, Andreas Seemayer, and Frank Uwe Renner — Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf

Due to the very negative potential of Li, Li-ion batteries supply a high voltage and high energy density. Lithium ion batteries will continue to be the most important power source for mobile applications in the near future. For achieving longer lifetime and even higher capacity a more detailed knowledge of the basic processes is required. Li alloys with Si, Sn, or Ag provide anodes with higher capacities than the actually used graphite. We focus on the investigation of the electrochemical insertion process of Lithium into simple model anodes like polycrystalline discs or thin films. As electrolyte we use the ionic liquid 1-Butyl-1-methylpyrrolidinium bis(trifluoromethanesolfonyl)imide (PYR14TFSI) with 0.3M LiTFSI. The electrochemical processes, i.e. alloying and dealloying of the anode material, are characterised by Cyclic Voltammetry (CV). The chemical characterisation of the produced alloys is performed ex-situ by the means of Atom Probe Tomography (APT) and Secondary Ion Mass Spectrometry (SIMS). First in-situ measurements using a droplet cell for x-ray diffraction (XRD) experiments using synchrotron radiation are presented.