Anode materials for rechargeable lithium and sodium batteries
The currently most established system for rechargeable energy storage is the Li - Ion battery owing to its high energy density and excellent cycle stability. The battery typically works with a highly reversible graphite anode which provides sufficient capacity when combined with current cathode materials (i.e. LiCoO2). However, future cathode materials (i.e. NMC) and novel lithium – cell designs (i.e. Li - S battery) require considerable higher capacity from the anode to construct a practical cell architecture. Furthermore, graphite shows high reversibility only in carbonate-based electrolytes which may not be compatible for prospective cathode materials. Therefore, the development of advanced anode materials in secondary batteries is of high importance and needs to be developed in close dependence on all the other cell components (i.e. separator, cathode, electrolyte). Among Li - ion batteries, the sodium - ion battery is also a very promising cell type for economical energy storage. Similar to Li – ion batteries, advanced anode materials for sodium storage are of particular interest.
Our group develops and investigates anode materials for rechargeable lithium and sodium batteries. In order to obtain higher capacities than graphite (372 mAh/g), we explore materials on conversion and alloying basis. The topic of our investigations are silicon / antimony alloys and metal oxides for lithium and sodium storage. Special focus is given to hierarchical designed nanostructures due to its unique properties for energy storage. Our synthesis techniques involve top-down and bottom-up approaches.
Dr. Lars Giebeler
T. Jaumann, J. Balach, M. Klose, S. Oswald, U. Langklotz, A. Michaelis, J. Eckert, L. Giebeler: SEI-component formation on sub 5 nm sized silicon nanoparticles in Li-ion batteries: the role of electrode preparation, FEC addition and binders, Physical Chemistry Chemical Physics 17 (2015) Nr. 38, S. 24956-24967 URL
T. Jaumann, M. Herklotz, M. Klose, K. Pinkert, S. Oswald, J. Eckert, L. Giebeler: Tailoring hollow Silicon-Carbon nanocomposites as high-performance anodes in secondary Lithium-based batteries through economical chemistry, Chemistry of Materials 27 (2015), S. 37-43. URL
M.L. Martine, G. Parzych, F. Thoss, L. Giebeler, J. Eckert: Na-Sb-Sn ternary phase diagram at room temperature for potential anode materials in sodium-ion batteries, Solid State Ionics 268 (2014), S. 261-264. URL
F. Thoss, L. Giebeler, K. Weisser, J. Feller, J. Eckert: Preparation and cycling performance of Iron or Iron Oxide containing amorphous Al-Li alloys as electrodes, Inorganics 2 (2014), S. 674-682. URL
D. Wadewitz, W. Gruner, M. Herklotz, M. Klose, L. Giebeler, A. Voss, J. Thomas, T. Gemming, J. Eckert, H. Ehrenberg: Investigation of copper-cobalt-oxides as model systems for composite interactions in conversion-type electrodes for Lithium-Ion batteries, Journal of the Electrochemical Society 160 (2013) S. A1333-A1339. URL