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Your search keyword '"Lindbergh, Göran"' showing total 110 results
Start Over Author "Lindbergh, Göran" Publisher the electrochemical society
110 results on '"Lindbergh, Göran"'

5. Exposing Heterogeneous Degradation in Prismatic Lithium-Ion Cells

Author

Smith, Alexander James, primary, Mikheenkova, Anastasiia, additional, Fang, Yuan, additional, Ahmed, Istaq, additional, Ekström, Henrik, additional, Svens, Pontus, additional, Furo, Istvan, additional, Hahlin, Maria, additional, Lacey, Matthew, additional, Lindbergh, Göran, additional, and Wreland Lindström, Rakel, additional

Published
2022
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18. Expanded In Situ Aging Indicators for Lithium-Ion Batteries with a Blended NMC-LMO Electrode Cycled at Sub-Ambient Temperature

Author

Smith, Alexander J., Svens, Pontus, Varini, Maria, Lindbergh, Göran, Lindström, Rakel, Smith, Alexander J., Svens, Pontus, Varini, Maria, Lindbergh, Göran, and Lindström, Rakel

Abstract

An important step toward safer and more reliable lithium-ion battery systems is the improvement of methods for detection and characterization of battery degradation. In this work, we develop and track aging indicators over the life of 18650-format lithium-ion batteries with a blended NMC532-LMO positive electrode and graphite negative electrode. Cells are cycled until reaching 80% of their original capacity under combinations of four cycling conditions: ambient and sub-ambient temperatures (29 degrees C and 10 degrees C) and fast and mild rates (2.7 and 1.0C). Loss of lithium inventory dominates aging for all cases, with additional loss of NMC capacity under the combination of sub-ambient temperature and mild rate. A novel, easily acquired polarization factor complements capacity fade analysis; it correlates well with impedance and galvanostatic cycle life and indicates changes in active aging processes. These processes are further revealed by differential voltage analysis (DVA) and incremental capacity analysis (ICA). New indicators and aging scenarios are evaluated for these techniques and supported by post mortem analysis. From in operando cycling data and a single, slow discharge curve, these four methods (capacity fade, polarization factor, DVA, and ICA) comprise a simple, explanatory, and non-invasive toolbox for evaluating aging in lithium-ion battery systems., QC 20220301

Published
2021
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19. Determination of Kinetic Parameters for the Oxygen Reduction Reaction on Platinum in an AEMFC

Author

Grimler, Henrik, Carlson, Annika, Ekström, Henrik, Lagergren, Carina, Wreland Lindström, Rakel, Lindbergh, Göran, Grimler, Henrik, Carlson, Annika, Ekström, Henrik, Lagergren, Carina, Wreland Lindström, Rakel, and Lindbergh, Göran

Abstract

To promote the development of anion exchange membrane fuel cells (AEMFC), an understanding of the oxygen reduction reaction (ORR) kinetics in porous gas diffusion electrodes is essential. In this work, experimental polarisation curves for electrodes with different platinum catalyst loadings and oxygen partial pressures at the cathode are fitted to a physics-based porous electrode model in the voltage range from open circuit voltage (OCV) to 0.7 V. Polarisation curves measured with different anode catalyst loadings, and hydrogen partial pressures, were used to verify the model. The reactions are described using a two-step Tafel-Volmer pathway at the anode and concentration-dependent Butler-Volmer kinetics at the cathode. A good fit to experimental data in the kinetic region is obtained with an exchange current density of 1.0.10(-8)Acm(-2), a first order dependency on oxygen partial pressure, and a charge transfer coefficient of 0.8 for the ORR. For lower oxygen partial pressure, hydrogen crossover is needed to explain the downward shift of the polarisation curves in the kinetic region. In the experimental data, the polarisation curves show an apparent limiting current density at lower hydrogen partial pressures, explained by the lower rate of the Tafel step at these conditions., QC 20211223

Published
2021
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20. An Aging Study of NCA/Si-Graphite Lithium-Ion Cells for Off-Grid Photovoltaic Systems in Bolivia

Author

Benavente Araoz, Fabian Andres, Ko, Jing Ying, Lundblad, Anders, Ekström, Henrik, Lindbergh, Göran, Benavente Araoz, Fabian Andres, Ko, Jing Ying, Lundblad, Anders, Ekström, Henrik, and Lindbergh, Göran

Abstract

Performance and aging of lithium-ion 18650 cylindrical cells containing NCA and Si-graphite composite electrodes are investigated during long-term low current rate (similar to 0.1C) cycling protocol resembling charge/discharge profile of off-grid photovoltaic battery system. The cells are cycled within 30% and 75% state-of-charge ranges ( increment SOC) with low, middle and high cut-off voltages. Electrochemical impedance spectroscopy data of full cylindrical cells exhibit severe aging for cells that have been cycled at higher cut-off voltage of 4.2 V. Symmetric cell impedance from each electrode shows that aging of NCA is dominant over aging of Si-graphite. Using a Newman-based impedance model, the NCA symmetrical cells' impedance spectra are parameterized to evaluate the aging modes. The resulting parameterization confirms increased particles' surface film resistance due to possible electrolyte oxidation and tortuosity increase at high cut-off voltages. Cycling the cells with middle and low cut-off voltages causes few significant changes when compared to calendar-aged samples. This opens up the possibility to significantly increase battery lifetime for small photovoltaic battery systems in rural areas of Bolivia., QC 20211116

Published
2021
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21. The Hydrogen Electrode Reaction in the Anion Exchange Membrane Fuel Cell

Author

Carlson, Annika, Grimler, Henrik, Ekström, Henrik, Lagergren, Carina, Wreland Lindström, Rakel, Lindbergh, Göran, Carlson, Annika, Grimler, Henrik, Ekström, Henrik, Lagergren, Carina, Wreland Lindström, Rakel, and Lindbergh, Göran

Abstract

The hydrogen electrode in the anion-exchange membrane fuel cell needs further attention to understand the overall cell limitations. In this study, electrochemical impedance spectroscopy and galvanodynamic measurements in combination with a physics-based model are used to determine the kinetic parameters of the hydrogen oxidation reaction and hydrogen evolution reaction on Pt/C porous gas-diffusion electrodes in an AEMFC. Two semicircles are observed in the Nyquist plot of a symmetrical AEM hydrogen cell, indicating a two-step reaction pathway. The fit of the model shows that the Tafel-Volmer pathway describes the kinetics better than the Heyrovsky-Volmer pathway. The reaction rates of the adsorption and charge transfer steps are similar in magnitude implying that both need consideration during modeling and evaluation of the hydrogen electrode. Furthermore, the performance is limited also by the ionic conductivity in the electrode. Comparison of the impedance of the HOR and a hydrogen/oxygen AEMFC indicates that the low-frequency semicircle is mainly associated with the oxygen reduction reaction and the cathode, while the high-frequency semicircle is likely related to a combination of the anode and the cathode. Based on this work, a platform for further studies of losses and total impedance of operating AEMFC has been created., QC 20210414

Published
2021
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48. Electrode kinetics of the Ni porous electrode for hydrogen production in the molten carbonate electrolysis cell (MCEC)

Author

Hu, Lan, Lindbergh, Göran, Lagergren, Carina, Hu, Lan, Lindbergh, Göran, and Lagergren, Carina

Abstract

The hydrogen evolution reaction in molten carbonate salts is an important process in the development of the molten carbonate electrolysis cell (MCEC). In the present study the kinetics of hydrogen production in the Ni porous electrode in a MCEC is investigated. The general procedure is to determine the reaction orders of hydrogen, carbon dioxide and water. For this purpose steady-state polarization data were recorded under different gas compositions and temperatures. The exchange current densities were calculated from the slopes of the polarization curves at low overpotential. On the basis of that, the partial pressure dependencies of hydrogen, carbon dioxide and water could be determined in the electrolysis operation., Part of ISBN 978-160768539-5QC 20220621

Published
2015
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