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Lisa Kathrin Willenberg; Philipp Dechent; Georg Fuchs; Moritz Teuber; Marcel Eckert; Martin Graff; Niklas Kürten; Dirk Uwe Sauer; Egbert Figgemeier. The Development of Jelly Roll Deformation in 18650 Lithium-Ion Batteries at Low State of Charge. Journal of The Electrochemical Society 2020, 167, 120502 .
AMA StyleLisa Kathrin Willenberg, Philipp Dechent, Georg Fuchs, Moritz Teuber, Marcel Eckert, Martin Graff, Niklas Kürten, Dirk Uwe Sauer, Egbert Figgemeier. The Development of Jelly Roll Deformation in 18650 Lithium-Ion Batteries at Low State of Charge. Journal of The Electrochemical Society. 2020; 167 (12):120502.
Chicago/Turabian StyleLisa Kathrin Willenberg; Philipp Dechent; Georg Fuchs; Moritz Teuber; Marcel Eckert; Martin Graff; Niklas Kürten; Dirk Uwe Sauer; Egbert Figgemeier. 2020. "The Development of Jelly Roll Deformation in 18650 Lithium-Ion Batteries at Low State of Charge." Journal of The Electrochemical Society 167, no. 12: 120502.
The detection of lithium plating is a key enabler for the development of fast charging techniques. This work compares different plating detection methods to assess the validity of electrical stripping detection methods. To achieve this, we charged a commercial battery cell under different charging regimes regarding temperature, cooling, current, and maximum voltage. Indicators for plating were collected by electrical stripping measurements as well as optical and laser microscopy measurements on fully charged disassembled cells. The results of the electrical measurements agree with a previous publication by Campbell et al. The disassembled cell shows obvious indications of plating in the form of discolored regions and microscopic indications in the form of dendritic structures on the anodes.
Florian Ringbeck; Christiane Rahe; Georg Fuchs; Dirk Uwe Sauer. Identification of Lithium Plating in Lithium-Ion Batteries by Electrical and Optical Methods. Journal of The Electrochemical Society 2020, 167, 090536 .
AMA StyleFlorian Ringbeck, Christiane Rahe, Georg Fuchs, Dirk Uwe Sauer. Identification of Lithium Plating in Lithium-Ion Batteries by Electrical and Optical Methods. Journal of The Electrochemical Society. 2020; 167 (9):090536.
Chicago/Turabian StyleFlorian Ringbeck; Christiane Rahe; Georg Fuchs; Dirk Uwe Sauer. 2020. "Identification of Lithium Plating in Lithium-Ion Batteries by Electrical and Optical Methods." Journal of The Electrochemical Society 167, no. 9: 090536.
Lithium-Ion batteries are used in ever more demanding applications regarding operating range and safety requirements. This work presents a series of high-temperature abuse experiments on a nickel-manganese-cobalt oxide (NMC)/graphite lithium-ion battery cell, using advanced in-operando measurement techniques like fast impedance spectroscopy and ultrasonic waves, as well as strain-gauges. the presented results show, that by using these methods degradation effects at elevated temperature can be observed in real-time. These methods have the potential to be integrated into a battery management system in the future. Therefore they make it possible to achieve higher battery safety even under the most demanding operating conditions.
Hendrik Zappen; Georg Fuchs; Alexander Gitis; Dirk Uwe Sauer. In-Operando Impedance Spectroscopy and Ultrasonic Measurements during High-Temperature Abuse Experiments on Lithium-Ion Batteries. Batteries 2020, 6, 25 .
AMA StyleHendrik Zappen, Georg Fuchs, Alexander Gitis, Dirk Uwe Sauer. In-Operando Impedance Spectroscopy and Ultrasonic Measurements during High-Temperature Abuse Experiments on Lithium-Ion Batteries. Batteries. 2020; 6 (2):25.
Chicago/Turabian StyleHendrik Zappen; Georg Fuchs; Alexander Gitis; Dirk Uwe Sauer. 2020. "In-Operando Impedance Spectroscopy and Ultrasonic Measurements during High-Temperature Abuse Experiments on Lithium-Ion Batteries." Batteries 6, no. 2: 25.
This paper proposes a testing method that allows the monitoring of the development of volume expansion of lithium-ion batteries. The overall goal is to demonstrate the impact of the volume expansion on battery ageing. The following findings are achieved: First, the characteristic curve shape of the diameter change depended on the state-of-charge and the load direction of the battery. The characteristic curve shape consisted of three areas. Second, the characteristic curve shape of the diameter change changed over ageing. Whereas the state-of-charge dependent geometric alterations were of a reversible nature. An irreversible effect over the lifetime of the cell was observed. Third, an s-shaped course of the diameter change indicated two different ageing effects that led to the diameter change variation. Both reversible and irreversible expansion increased with ageing. Fourth, a direct correlation between the diameter change and the capacity loss of this particular lithium-ion battery was observed. Fifth, computer tomography (CT) measurements showed deformation of the jelly roll and post-mortem analysis showed the formation of a covering layer and the increase in the thickness of the anode. Sixth, reproducibility and temperature stability of the strain gauges were shown. Overall, this paper provides the basis for a stable and reproducible method for volume expansion analysis applied and established by the investigation of a state-of-the-art lithium-ion battery cell. This enables the study of volume expansion and its impact on capacity and cell death.
Lisa K. Willenberg; Philipp Dechent; Georg Fuchs; Dirk Uwe Sauer; Egbert Figgemeier. High-Precision Monitoring of Volume Change of Commercial Lithium-Ion Batteries by Using Strain Gauges. Sustainability 2020, 12, 557 .
AMA StyleLisa K. Willenberg, Philipp Dechent, Georg Fuchs, Dirk Uwe Sauer, Egbert Figgemeier. High-Precision Monitoring of Volume Change of Commercial Lithium-Ion Batteries by Using Strain Gauges. Sustainability. 2020; 12 (2):557.
Chicago/Turabian StyleLisa K. Willenberg; Philipp Dechent; Georg Fuchs; Dirk Uwe Sauer; Egbert Figgemeier. 2020. "High-Precision Monitoring of Volume Change of Commercial Lithium-Ion Batteries by Using Strain Gauges." Sustainability 12, no. 2: 557.
This work conducts a post-mortem analysis of a cycled commercial lithium-ion pouch cell under an induced inhomogeneous pressure by using a stainless-steel sphere as a force transmitter to induce an inhomogeneous pressure distribution on a cycled lithium-ion battery. After the cycling, a macroscopic and microscopic optical analysis of the active and passive materials was executed. Also, scanning electron microscopy was used to analyze active material particles. The sphere shape results in a heterogenic pressure distribution on the lithium-ion battery and induces a ring of locally high electrochemical activity, which leads to lithium plating. Furthermore, a surface layer found on the anode, which is a possible cause of electrolyte degradation at the particle–electrolyte interface. Significant deformation and destruction of particles by the local pressure was observed on the cathode. The analysis results validate previous simulations and theories regarding lithium plating on edge effects. These results show that pressure has a strong influence on electrolyte-soaked active materials.
Georg Fuchs; Lisa Willenberg; Florian Ringbeck; Dirk Uwe Sauer. Post-Mortem Analysis of Inhomogeneous Induced Pressure on Commercial Lithium-Ion Pouch Cells and Their Effects. Sustainability 2019, 11, 6738 .
AMA StyleGeorg Fuchs, Lisa Willenberg, Florian Ringbeck, Dirk Uwe Sauer. Post-Mortem Analysis of Inhomogeneous Induced Pressure on Commercial Lithium-Ion Pouch Cells and Their Effects. Sustainability. 2019; 11 (23):6738.
Chicago/Turabian StyleGeorg Fuchs; Lisa Willenberg; Florian Ringbeck; Dirk Uwe Sauer. 2019. "Post-Mortem Analysis of Inhomogeneous Induced Pressure on Commercial Lithium-Ion Pouch Cells and Their Effects." Sustainability 11, no. 23: 6738.