Helmut Ehrenberg Full Professor (W3), Inorganic Chemistry. Born 1966; Diploma 1991 in Physics, Technische Hochschule Darmstadt; Doctoral Degree 1996 TU Darmstadt in Materials Science; Marie-Curie Postdoctoral Fellow 1997-99 University of Cambridge, UK; Habilitation 2005, TU Darmstadt; Head of Department 2006-2010, IFW Dresden, Head of the Institute for Applied Materials-Energy Storage Systems (IAM-ESS) since 2012. Phone: +49 721 608 47915, Fax: +49 721 608 28521 E-Mail: [email protected] between the different components in a full operational device. Studies are therefore performed from the macroscopic length scale of a device down to surface analysis and nanodomain regions. Focus (II) is based on a strong crystallographic background and correlates the underlying crystal structures with resulting properties. Different polymorphs and phase transitions, induced by high pressure, temperature or external magnetic and electric fields are considered to elucidate the effects of structural changes on the performance of materials. Dedicated setups have been developed for in situ diffraction experiments in external fields. Transitionmetal oxides are in the centre of interest, but intermetallic compounds and composite materials are also investigated in detail. Principal Research interests Two main aspects are in the focus of research: (I) Materials for energy storage, studied at the full electrochemical cell level. (II) Structure-property relationships for functional materials, including magnetic properties, transport behaviour and piezoelectric response. Focus (I) addresses the development of new battery materials, the characterization of electrochemical and structural properties as well as the elucidation of the fundamental mechanisms involved in storing energy. To accomplish that, enhanced and dedicated in operando characterization techniques are developed, using synchrotron and neutron radiation. New energy storage concepts like functional composites and beyond Li-ion batteries are also considered, like Mg-ion based batteries, Li-oxygen batteries and Redox-Flow batteries. Particular attention is given to the life time of energy storage devices and the relevant degradation mechanisms. This requires bridging the gap between fundamental research on model systems to reveal individual processes and the full complexity of functional composite materials with very strong materials interactions Scheme of a hybrid cathode, based on an ordered array of carbon nanofilaments (CNF) coated with LiCoPO4 (left), individual coated CNF (middle) and a brush of coated CNFs (right), see  for details. Selected publications 1. „Understanding structural changes in NMC Liion cells by in situ neutron diffraction.“ O. Dolotko, A. Senyshyn, M.J. Mühlbauer, K. Nikolowski, H. Ehrenberg J. Power Sources 2014, 255, 197–203. 2. “Binary Lithium Indides Li22–xIn8+x (x = 0.1), Li11–xIn4+x (x = 1.05), and Li10–xIn2+x (x = 1.59) with Clusters.” I. Chumak, V. Pavlyuk, H. Ehrenberg Eur. J. Inorg. Chem. 2014, 2053–2064. 3. „LiZn4-x (x = 0.825) as a (3 + 1)-dimensional modulated derivative of hexagonal close packing.“ V Pavlyuk, I. Chumak, L. Akselrud, S. Lidin, H. Ehrenberg Acta Cryst. 2014, B70, 212–217. 4. “Advances in in situ powder diffraction of battery materials: a case study of the new beamline P02.1 at DESY, Hamburg” M. Herklotz, F. Scheiba, M. Hinterstein, K. Nikolowski, M. Knapp, A.-C. Dippel, L. Giebeler, J. Eckert, H. Ehrenberg J. Appl. Cryst. 2013, 46, 1117-1127. 5. “Disordered carbon nanofibers/LiCoPO4 composites as cathode materials for lithium ion batteries” A. Sarapulova, D. Mikhailova, L. A. Schmitt, S. Oswald, N. Bramnik, H. Ehrenberg, J. Sol-Gel Sci. Technol. 2012, 62, 98–110.
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