Marc Paulus

 

Lithium diffusion in solid state electrolytes

Crystal structure of Li10GeP2S12, with coordination polyhedral and stochastically occupied lithium sites Copyright: M. Paulus

The development of novel and improved battery systems is becoming increasingly important for the future, particularly with regard to electric mobility and temporary storage of surplus electricity from renewable energy sources. In this case the trend is moving more and more to all-solid-state batteries due to their higher safety and durability compared to batteries with liquid electrolytes. A problem of solid-state electrolytes has been their slow ionic conduction but there are now solid-state electrolytes, such as Li10GeP2S12 (LGPS), whose conductivity is in the range of liquid electrolytes. The aim of this PhD thesis is to synthesize sulfide based electrolytes and to investigate the fast lithium ion diffusion in these materials by NMR spectroscopy. The origin and the properties of the fast lithium migration will be elucidated and individually the applied NMR methods will be developed.