To understand battery systems, simulation tools are often employed. For a high level of accuracy and reliability, these tools need accurate values of relevant physico-chemical parameters of the materials being involved. In case of binary electrolyte solutions, at least four different concentration and temperature-dependent transport parameters are required: the conductivity, the binary diffusion coefficient, the transference number, and the thermodynamic factor.
In this application note, we demonstrate how to determine the lithium ion transference number of a commercial liquid binary lithium ion battery electrolyte based on the very elegant and one-step very-low-frequency impedance spectroscopy (VLF-EIS) method elaborated by Wohde, Balabajew, and Roling.
To cite this application note, please use: “Drüschler et al., rhd instruments GmbH & Co. KG, Application Note: Determination of the lithium ion transference number of a battery electrolyte by VLF-EIS, February 2020”.