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Mobility of Li Ions in Solids

Fundamental research on Lithium ion conductors

The precise study of the elementary processes of ion diffusion in solids is in the case of lithium ion conductors currently of enormous importance worldwide both for physico-chemical basic research and for applied materials research. 

The FOR 1277 molife "Mobility of Li ions in solids", which is funded by the Deutsche Forschungsgemeinschaft (DFG) with a total of € 3.6 m for the first period and of € 2.7 m for the second period, is dedicated to basic studies of atomic dynamic and kinetic processes in Li-containing solids, that is model substances with partly application-oriented character. Molife comprises seven projects with different, but complementary main focuses. These are ranging from dimensionality and isotopic effects in Li diffusion via structurally disordered or nanostructured solids to the study of extremely slow ionic movements.

For these aims a wide range of methods, which are unique in this combination, is used. This includes, e.g., the mass tracer method, impedance and conductivity spectroscopy, numerous nuclear magnetic resonance (NMR) techniques as well as neutron reflectrometry and neutron diffractometry. Within the framework of FOR 1277 the DFG funds two new large instruments: a solid state NMR spectrometer and an impedance spectrometer.

Due to the use of complementary micro- and macroscopic measurement techniques, atomic motion processes can be studied over very large time and length scales, so that, for example, Li jump rates can be recorded from the sub-Hz up to the GHz range. Theoretical studies involving particular quantum chemical calculations and Monte Carlo simulations accompany the experimentally based projects.

Model substances and materials include among others 1D- und 2D- ion conductors, nanostructured materials (nanotubes and nanowires), glasses, strongly disordered oxides, etc.