Dr. Stefan Oswald

 

Lithium-Ion Battery Research, Focus on High-Energy Cathodes, Electrochemical Impedance Spectroscopy (EIS), On-Line Electrochemical Mass Spectrometry (OEMS) and X-Ray Photoelectron Spectroscopy (XPS)

• Degradation Mechanisms of Nickel-Rich Cathode Materials (e.g., NCM622, NCM851005)
• Impedance Analysis utilizing a Micro-Reference Electrode
• Analysis of Particle Cracking of Layered Oxide Cathode Materials during Charge/Discharge Cycling
• Manipulation of Surface Properties and Washing of Nickel-Rich Cathode Materials
• Synthesis and Characterization of Single-Crystalline Nickel-Rich NCMs

Articles

Stefan Oswald*^,=, Rebecca Wilhelm⁼, Tim Kratky, László Szentmiklósi, Boglárka Maróti, Ildikó Harsányi, Sebastian A. Hallweger, Gregor Kieslich, Sebastian Günther, Hubert A. Gasteiger / Effect of Washing on Nickel-Rich NCMs: Methodology to Quantify the Lithium/Proton-Exchange Kinetics, the Inserted Protons, and the Structural Changes / J. Mater. Chem. A 12 25140 (2024) – DOI

Stefan Oswald*^,=, Moritz Bock⁼, and Hubert A. Gasteiger / The Implications of Particle Morphology on the Capacity Retention, Side Reactions, and Impedance Build-Up of Nickel-Rich NCMs upon Cycling in Full-Cells: Poly- vs. Single-Crystalline NCM851005 / J. Electrochem. Soc. 170 090505 (2023) – DOI

Stefan Oswald & Hubert A. Gasteiger / The Structural Stability Limit of Layered Lithium Transition Metal Oxides Due to Oxygen Release at High State of Charge and Its Dependence on the Nickel Content / J. Electrochem. Soc. 2023, 170 030506 - DOI

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Elucidating the Implications of Morphology on Fundamental Characteristics of Nickel-Rich NCMs: Cracking, Gassing, Rate Capability, and Thermal Stability of Poly- and Single-Crystalline NCM622, 2022, J. Electrochem. Soc. 169 050501 – DOI

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Novel Method for Monitoring the Electrochemical Capacitance by In Situ Impedance Spectroscopy as Indicator for Particle Cracking of Nickel-Rich NCMs: Part III. Development of a Simplified Measurement Setup, 2022, J. Electrochem. Soc. 169 040552 – DOI

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Novel Method for Monitoring the Electrochemical Capacitance by In Situ Impedance Spectroscopy as Indicator for Particle Cracking of Nickel-Rich NCMs: Part II. Effect of Oxygen Release Dependent on Particle Morphology, 2021, J. Electrochem. Soc. 168 120501 – DOI

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Novel Method for Monitoring the Electrochemical Capacitance by In Situ Impedance Spectroscopy as Indicator for Particle Cracking of Nickel-Rich NCMs: Part I. Theory and Validation, 2020, J. Electrochem. Soc. 167 100511 – DOI

 

Conference presentations

Stefan Oswald & Hubert A. Gasteiger, Determining the Structural Stability Limit of NCMs at High State of Charge Depending on the Composition, poster presentation, Gordon Research Conference (2022), Ventura, California, USA.

Stefan Oswald & Hubert A. Gasteiger, Determining the Structural Stability Limit of NCMs at High State of Charge Depending on the Composition, oral presentation, Gordon Research Seminar (2022), Ventura, California, USA.

Stefan Oswald & Hubert A. Gasteiger, Quantifying Particle Cracking of NCMs: Development of a Simplified Measurement Setup, oral presentation, 241st ECS Meeting (2022), Vancouver, Canada.

Stefan Oswald, Moritz Bock & Hubert A. Gasteiger, Elucidating the Effect of the Morphology of Ni-Rich CAMs on Their Cycling Performance: Poly- vs. Single-Crystalline NCM851005, oral presentation, 240th ECS Meeting (2021), online meeting.

Stefan Oswald, Moritz Bock & Hubert A. Gasteiger, Study on the Effect of Crystal Size on the Performance of Ni-Rich Cathode Active Materials: Poly- vs. Single Crystalline NCM622, oral presentation, Pacific Rim Meeting of the Electrochemical Society (2020), online meeting.

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Effect of Oxygen Release on the Morphology of Ni-Rich CAMs Monitored by In Situ Impedance Spectroscopy, oral presentation, Electrochemistry Undercover of the Gesellschaft Deutscher Chemiker (2020), online meeting.

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Monitoring the Electrochemical Capacitance by In Situ Impedance Spectroscopy as Indicator for Particle Degradation of Ni-Rich Cathode Active Materials, oral presentation, 70th Annual Meeting of the International Society (2019), Durban, South Africa.

Stefan Oswald, Daniel Pritzl, Morten Wetjen & Hubert A. Gasteiger, Quantification of NCM and LFP Particle Breaking During Charge-Discharge Cycling Using Impedance Spectroscopy, poster presentation, Electrochemistry of the Gesellschaft Deutscher Chemiker (2018), Ulm, Germany.

Stefan Oswald & Andreas Gruhle, Highly Precise Measurement of the Heat Conductivity of Lithium-Ion Battery Cells Perpendicular to the Layer Plane, poster presentation, Advanced Automotive & Industrial Battery Conference Europe (2016), Mainz, Germany.