Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 25: POSTER Electronic Structure and Spectroscopy
CPP 25.3: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
7Li NMR as a tool for the characterization of functional materials for lithium secondary batteries — •Nikolaus Nestle1, Sina Gumann1, Verena Liebau2, Robert Kolb2, Claudia Fasel2, Hans-Gerhard Bremes2, Ralf Riedel2, Natalia Bramnik2, and Helmut Ehrenberg2 — 1Institute of condensed matter physics, TU Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany — 2Department of materials science, TU Darmstadt, D-64289 Darmstadt, Germany
Rechargeable lithium batteries have found wide-spread use in mobile electronic appliances during the last few years. Improving the performance of the electrode materials and the electrolyte with respect to electrical cycling stability, safety, energy density and cost is a major challenge for the further improvement of lithium batteries. To achieve these goals, a microscopic understanding of the chemical structure of the materials and the processes taking place during charging and discharging is needed. A significant part of the research efforts in the SFB 595 No-dqElectric fatigue in functional materialsNo-dq is devoted to this topic. One of the experimental tools in this project is solid state NMR which is used to characterize the chemical environment of the Li ions in the materials and also their dynamic and transport properties. Results on various types of materials such as lithiated SiCN ceramics and LiCoO2 are presented and discussed in the context of findings from other techniques such as electrochemical measurements, ESR, X-ray and Raman spectroscopy. Furthermore, approaches to improving the sensitivity of NMR for studies on materials extracted from tiny battery models are discussed.