Physical Electrochemistry - Ion Transport - Interfaces - Interphases - Energy Storage
By measuring different transport parameters, like ionic conductivity, Li+ transference number under anion-blocking conditions and salt diffusion coefficient, we characterize the ion correlation parameters of concentrated liquid electrolyte systems.
We work on the synthesis and characterization of new Li+ and Na+ solid electrolytes.
The solid electrolyte interphase (SEI) is a passivation layer on the graphite anode of lithium-ion batteries. Ion, molecule and electron transport across the SEI is not well understood up to now. Therefore, we form SEIs on planar model electrolytes, and we characterize their morphology and transport properties.
We fabricate composite electrolytes for conventional lithium ion batteries and for all-solid-state batteries. Their morphology is characterized by using FIB-SEM, while ion transport properties are investigated by means of electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT).
ESM is a scanning probe microscopy (SPM) technique used for the characterization of electrochemical processes on the nanoscale. The method aims at detecting local strains in mixed ion-electron conductors due to electrochemically induced compositional changes.
In cooperation with Fraunhofer IEE in Kassel, the transport properties and ageing of the solid electrolyte interphase (SEI) are incorporated in a battery simulation software (BaSiS toolkit). This project aims at improved predictions of battery ageing, which are important for developing batteries with longer lifetimes.
We study various solid electrolyte systems in combination with common cathode and anode materials to build and electrochemically characterize all-solid-state batteries.