ChemElectroChem
ChemElectroChem
4 years ago

Electrode-Resolved Monitoring of the Ageing of Large-Scale Lithium-Ion Cells by using Electrochemical Impedance Spectroscopy

Electrode-Resolved Monitoring of the Ageing of Large-Scale Lithium-Ion Cells by using Electrochemical Impedance Spectroscopy
Tom Patrick Heins, Nicolas Schlüter, Uwe Schröder
The ageing of large-scale lithium-ion batteries due to prolonged cycling was investigated by means of electrochemical impedance spectroscopy. The resulting spectra were analyzed by using the method of the distribution of relaxation times. Thereby, the number of distinguishable polarization processes that contribute to the overall cell electrochemistry was determined. The physical meaning of these polarization processes was clarified by the assessment of their temperature dependences as well as by comparative measurements in three-electrode setup cells. In this way, electrode-resolved interpretation of impedance spectra of large-scale lithium-ion cells without any kind of reference electrode was achieved. Based on this electrode resolution, the origin of the cell degradation due to cycling could be elucidated. Not for reference: The implementation of reference electrodes into large-scale stacked lithium-ion batteries is barely possible, owing to their architecture. Thus, detailed information on the performance of each electrode is difficult to access. By applying the method of the distribution of relaxation times, the loss processes found in the spectra can be assigned to anode and cathode, respectively. The ageing of large-scale lithium-ion batteries can, therefore, be monitored in an electrode-resolved way without a reference electrode.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700686

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