Welcome to the homepage of the group of Prof. Schönhoff

Our research is focusing on studying transport mechanisms in ion-conducting electrolytes by NMR methods, as well as on electrostatic self-assembly and characterization of novel materials from charged molecular building blocks.

 

Recent Highlights

Combining our favourite method of electrophoretic NMR with impedance spectroscopy, we propose a new method to determine ion drift velocities and transference numbers even for ions that cannot be directly detected by NMR. Where electrochemical methods often fail due to difficult handling of alkali metal electrodes, eNMR/IS provides an alternative way to quantify cation transference in beyond-lithium battery electrolytes

Figure: Transference numbers ti of TFSI anions (blue) and the respective cation species from eNMR/IS (green) in G3+MTFSI (M=Li, Na) and G3+Mg(TFSI)2 with 2:1 and 1:1 molar ratio (G3:salt) and in PEO+MTFSI (M=Li, K, Na) with r = [M]/[EO] = 0.1 and PEO+Mg(TFSI)2 with r = [Mg]/[EO] = 0.05. For comparison TLi as obtained from 7Li eNMR measure¬ments (red).

 

Mönich, C.; Andersson, R.; Mindemark, J.; Hernández, G.; Schönhoff, M.
Seeing the Unseen: Mg2+, Na+ and K+ Transference Numbers in Post-Li Battery Electrolytes by Electrophoretic Nuclear Magnetic Resonance
J. Am. Chem. Soc. 2024, 146(16), 11105-11114.
https://doi.org/10.1021/jacs.3c12272