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Transport processes at phase boundaries between liquid and solid electrolytes

• Li+-transfer between solid and liquid Li+-electrolytes
• Use of „hybrid electrolyte systems“: solid/liquid and organic/aqueous
• Clarification of the charge transfer kinetics
• Optimized Li-air, metal-air und Li-S-battery systems

For post-Lithium-ion batteries, like lithium-sulfur or lithium-air cells, it is advantageous to spatially separate the cathode and the anode by means of a solid electrolyte. Electrolytes adapted to the electrochemical conditions of the individual electrodes can thus be used without intermixing. In addition, internal short circuits caused by dendritic growth can be prevented.
However, the implementation of a solid electrolyte causes new phase boundaries which increase the overall resistance of the cell and thus reduce the potential. The charge transfer resistance at the solid/liquid interface is dependent on various factors, such as the used materials, the concentration of the liquid electrolyte, and the temperature.
To elucidate the charge transfer kinetics at a solid/liquid interface, a special electrochemical cell was designed to measure the potential drop. Various electrochemical measurement methods, such as DC polarization measurements or impedance spectroscopy, are used to characterize the properties.


[1] M. Schleutker, J. Bahner, C. Tsai, D. Stolten and C. Korte, Phys. Chem. Chem. Phys., 2017, DOI: 10.1039/C7CP05213H