Tortuosity Determination of Battery Electrodes and Separators by Impedance Spectroscopy
By Johannes Landesfeind, Johannes Hattendorff, A. Ehrl, Wolfgang A. Wall, H. Gasteiger. 2016
568 citations recorded by the source corpus.
Lithium ion battery performance at high charge/discharge rates is largely determined by the ionic resistivity of an electrode or separator which are filled with electrolyte. Key to understand and to model ohmic losses in porous battery components are porosity as well as tortuosity. In the first part, we use impedance spectroscopy measurements in a new experimental setup to obtain the tortuosities and MacMullin numbers of some commonly separators, demonstrating experimental errors of < 8%. In the second part, we present impedance measurements of electrodes in symmetric cells using a blocking electrode configuration, which is obtained by using a non-intercalating electrolyte. The effective ionic resistivity of the electrode can be fit with a transmission-line model, allowing us to quantify the porosity dependent MacMullin numbers and tortuosities of electrodes with different active materials and different conductive carbon content. Best agreement between the transmission-line model and the impedance data is found when constant-phase elements rather than simple capacitors are used.
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/1f6832c004de41107140afa155b90bcca3215500
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Citations in the corpus
- Investigating electrode calendering and its impact on electrochemical performance by means of a new discrete element method model: Towards a digital twin of Li-Ion battery manufacturing (2020, unknown): “[21 ,68,70] The latter is directly linked to the decrease in the electrode porosity (Figure 2B) and pores size distribution (Figure 3B), which slows down the migration and diffusion rate of ions within pores.”
- Tortuosity Effects in Lithium-Metal Host Anodes (2020, methodology): “We followed an electrochemical method previously developed by the Gasteiger group to determine the tortuosity of separators.(35) By measuring the high-frequency ionic resistances of electrolyte-infiltrated insulated graphene oxide aerogels (GOAs, before annealing reduction; Figures 2K and S8),(35,36”
- A Comparison between Electrochemical Impedance Spectroscopy and Incremental Capacity-Differential Voltage as Li-ion Diagnostic Techniques to Identify and Quantify the Effects of Degradation Modes within Battery Management Systems (2017, methodology): “CPEs are employed to represent the porosity and tortuosity characteristics of the electrodes [30].”