Solid State NMR
Structure and mechanism in the investigation of materials for the production of batteries
The research and development of renewable energy sources for the operation of portable electronic devices, automobiles or power grids has gained massively in importance. Examples include lithium-ion batteries, fuel cells and solar cells. We use solid-state NMR to analyze the structure, dynamics and reduction-oxidation mechanisms of energy carrier materials for Li-S and Li batteries.
Structure of nanoporous composite materials
Siloxane compounds such as silicates, clay, zeolites and mesoporous organosilicates are chemically inert materials with versatile applications. NMR spectroscopy is a valuable technique in the investigation of such materials with a focus on local structures. Our investigations focus on e.g. the degree of condensation, the heterogeneity of domains, the influence of surface functionalization of different materials, and the interaction of the porous host material with enclosed guest molecules.
The Dynamics of Fluids
The translational movement of electrolytes and ions is an important factor in the production of batteries. PFG NMR (DOSY) has the advantage to detect the translational motion of individual molecules because NMR measures with atomic resolution. PFG NMR and HR-MAS are used to study the diffusion characteristics of electrolytes and ionic liquids. Of particular interest is the influence of the diffusion behavior of different electrolyte systems in nano inclusions of porous membranes.
Solid State NMR / HR-MAS
Structural Analysis of Polymers
CP-MAS and HR-MAS-NMR are used to investigate the chemical structure, branching, phase behavior, domain heterogeneities and dynamics of various polymers such as polyurethanes, polyethylenes and polycarbonates.