University of Twente Student Theses
The Impacts of Pulse Discharge Frequencies on Lithium-ion Cell Degradation Using Electrochemical Impedance Spectroscopy
Ruiter, R. de (2024) The Impacts of Pulse Discharge Frequencies on Lithium-ion Cell Degradation Using Electrochemical Impedance Spectroscopy.
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| Abstract: | Understanding the degradation processes of lithium-ion batteries under varying pulse discharge profiles is crucial for the further development of high-performance lithium-ion batteries. This study explores how pulse discharge profiles impact the degradation of nickel manganese cobalt-based (NMC) lithium-ion cells. Focusing on the electrode-electrolyte interface and lithium-ion diffusion, this research systematically investigates the impact of different pulse discharge frequencies (0, 250, fZmin 850, and 1450 Hz) on battery degradation. This investigation extends beyond the insights provided by Electrochemical Impedance Spectroscopy (EIS) spectrum and its corresponding fitted equivalent circuit model (ECM), but also describes the underlying electrochemical processes. Key findings indicate that contrary to lessons learned for pulse charging regimes, the fZmin frequency, corresponding to the cell’s minimum impedance, resulted in the most significant degradation. This illustrates the dynamic and complex nature of lithium-ion cells response for pulsating loads and highlights the need for specific discharging optimization research which differs from pulse charging theory. |
| Item Type: | Essay (Master) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology |
| Programme: | Electrical Engineering MSc (60353) |
| Link to this item: | https://purl.utwente.nl/essays/100600 |
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