In a recent study, the Chair of Electrical Energy Storage Technology at TUM investigates the nuances of voltage reconstruction in degradation mode analysis. The study examines various initial parameterizations and algorithm settings. By using T-cells with lithium metal reference electrodes, the fitted single-electrode potentials could be directly validated against measured reference data — in addition to the standard validation against cell voltage.
🔗 Open-access article: https://iopscience.iop.org/article/10.1149/1945-7111/add4a0
Highlights of the study:
- High fitting accuracy with an RMSE of 3.1 mV at 100% SoH and < 15 mV at 55% SoH
- Loss of lithium inventory identified as the dominant degradation mechanism
- Low loss of active cathode material (1.0–3.2%), depending on the SoC cycling window
- Apparent loss of active anode material is initially negative due to amorphization of crystalline silicon
- Open-source toolbox including example dataset available: https://mediatum.ub.tum.de/1766548