collaborations with

Profilbereich Energiesysteme der Zukunft

DFG-Forschergruppe 1583

For a detailed understanding of the structure and dynamics of hydrogen bridging fluids in confined geometries it is necessary to systematically investigate the influence of surface properties (e.g. hydroaffinity, charge) as well as the dimension of the confinement. The aim of this project is to produce nanoporous systems with controlled dimensions, different geometries and functionalized surfaces. For this purpose, parallel oriented ion track channels etched mainly in polymers will be produced, which show a high variability regarding pore diameter (~15 nm – µm), length (10-100 µm) and geometry (cylindrical, conical). Furthermore, mesoporous SiO2 materials with smaller dimensions (diameter: ~2-30 nm, length: ~1 µm) will be available.

SFB 595

Li-ion batteries (LIB) have been of great interest for a variety of applications such as mobile energy storage devices, electro mobility (electrical and hybrid vehicles), and stationary energy sources. To obtain high energy densities as required for future applications, further materials and technology development is required, in particular concerning the positive electrodes (cathodes). A rational electrode materials development requires comprehensive understanding of fundamental material properties as well as their evolution during electrode operation (operando approach).

In this project we aim to investigate and improve structural, surface, and electrochemical characteristics of high energy layered lithiated transition metal oxide cathode materials for LIBs. Layered-oxide cathode materials provide both high voltage and high capacities, but suffer from capacity fade and degradation upon cycling. We employ a multi-method, in-situ/operando approach to understand the degradation mechanisms of these materials. Material properties will be modified by lattice doping and surface coatings to provide new design strategies and improved materials.