PhD projects

My project focuses on the computational design of solid-state sodium-based batteries, utilizing advanced techniques such as Density Functional Theory (DFT) and the Nudged Elastic Band (NEB) method. Through this research, we aim to explore the stability and electrochemical properties of these materials, contributing to the next generation of batteries.

The PhD project is being conducted at the Chair of Inorganic Active Materials for Electrochemical Energy Storage.

Block copolymers can undergo self-assembly to form a new class of microparticles termed polymer Cubosomes. Polymer cubosomes consist of a periodic channel system, they are open porous, and have a high loading capacity. I will use polymer cubosomes either as template for metal oxides and transition metals or convert them directly to mesoporous carbon. The resulting materials will be then tested as novel anode materials for Lithium-ion batteries.

The PhD project is being conducted at the Chair of Polymer materials for electrochemical storage.

My project focuses on Sn/carbon composite materials. I’m exploring different synthesis methods (spray drying, hydrothermal) and using several characterization techniques (electrochemical, scattering and spectroscopic ones). Our purpose is to increase the carbon capacity by adding tin in its framework, trying to mitigate the large volumetric expansion of the metal.

The PhD project is being conducted at the Chair of Inorganic Active Materials for Electrochemical Energy Storage.

My work will focus on the synthesis and characterisation of novel Na⁺ conductors with high ionic conductivity and thermodynamic stability.

The PhD project will be conducted as part of the 4SBATT project at the Chair of Inorganic Active Materials for Electrochemical Energy Storage.

Lithium-based batteries are widely regarded as the preferred choice for electrochemical energy storage. Enhancing their cost-effectiveness and performance has the potential to significantly broaden their range of applications and facilitate the development of new technologies that rely on energy storage. Solid polymer electrolytes have garnered significant interest in high-performance LMBs due to their leak-proof properties, low flammability, excellent processability, flexibility, wide electrochemical stability range, exceptional safety, and superior thermal stability. My doctoral project deals with designing new solid polymer electrolytes, fabricating the cells and performing electro and physicochemical analysis to generate better understanding for the ion transport mechanism and the reaction processes.

The PhD project is being conducted at the Chair of Polymer materials for electrochemical storage.

This project investigates the transport of electrons and ions in battery electrode materials as a function of their structure and grain size. We are synthesizing materials with different dimensionality of the percolation channels and particle sizes, to unveil the impact of confinement on both carrier types by studying their mobilities. First-principles calculations and machine learning will be used to construct a multi-scale model of the transport of both carriers in these structures. This approach will uncover ways to link or decouple electron and ion transport, hinting at future rational design criteria.

The PhD project is being conducted at the Chair of Inorganic Active Materials for Electrochemical Energy Storage within the SFB Multitrans - Project B01.

My research involves designing and synthesizing novel materials—such as high-nickel layered oxides and lithium-rich compounds. I also investigate their electrochemical properties using advanced characterization techniques. By improving energy density, cycle life, and thermal stability, my work aims to enable more efficient and durable batteries for applications in electric vehicles, grid storage, and consumer electronics. Additionally, I explore strategies to reduce reliance on critical raw materials, contributing to the development of sustainable energy storage solutions.

This PhD project is beeing conducted at the Chair of Inorganic Colloids for Electrochemical Energy storage. 

In my dissertation, I am investigating thermal problems in batteries at the microstructure level. We are particularly interested in how heat transport can be designed by using intrinsic thermally anisotropic materials. Graphite, as one of the most commonly used anode materials, is an example of such a material. The targeted alignment of graphite particles can improve heat dissipation in the battery. In addition, hot spots can be avoided, which in turn reduces the degradation of the active battery material.
I also work with laser-based methods and IR thermography for the non-destructive evaluation of battery materials and battery cells. The next step is to extend our setup to extract the thermal properties of calendered electrodes. Together with detailed information about the microstructure, we can then specifically modify the heat transport in the electrode.

The PhD project is being conducted at the Chair of Physical Chemistry I.

The aim of the study is to synthesise and characterise cathode materials with a Li-rich disordered rock salt structure, in order to improve the electrochemical performance of currently commercial cathode materials and to overcome some of the drawbacks that typically affect these materials. The samples will be studied using a combination of techniques including X-ray and neutron powder diffraction, in situ X-ray diffraction, and scanning electron microscopy to evaluate the crystal structure. Electrochemical tests and operando X-ray diffraction studies are also carried out in our laboratory to evaluate the performance and the crystallographic changes in real time.

The PhD project is being conducted at the Chair of Inorganic Active Materials for Electrochemical Energy Storage.

The aim of our research project is to establish an in-situ/operando solid-state NMR spectroscopic setup for batteries and energy materials. NMR spectroscopyn as an analytical method is sensitive to both, local structure and the mobility of ions in the materials.

This PhD project is supervised by Dr. Helen Grüninger at the Chair of Inorganic Chemistry III.

P2-type layered oxides exhibit superior Na ion conductivity and structural stability compared to their O3 analogues, making them promising candidate materials for the next generation batteries. However, the lower initial Na contents (Na/transition metals < 1) restrict their capacity during the first charge process, and the transitions between P- and O2-type structures during cycling further deteriorate their stability.
This work aims to increase the Na inventory in pristine cathode compositions, particularly relevant for full cell systems, while maintaining their cycling stability. The well-studied P2 material Na_2/3Ni_1/3Mn_2/3O₂ has been used as a starting reference material. Inactive element doping (e.g., Li incorporation) in the transition metal layers has been applied to stabilize the structure, while at the same time increasing the Na content.
In addition to fundamental structural and electrochemical characterization techniques, we also utilize advanced methods such as temperature-resolved in situ XRD in-house and operando XANES at synchrotron facilities. These techniques support the project in its ultimate quest of a high-capacity layered oxide with excellent cycling stability as a cathode material for sodium ion batteries.

The PhD project is being conducted at the Chair of Inorganic Active Materials for Electrochemical Energy Storage.

My project focuses on investigating electron transfer kinetics and the mechanisms of coupled electrochemical reactions, using electrochemical impedance spectroscopy (EIS). To achieve this, I will benchmark the implementation and analysis of impedance spectra using model systems and then extend its use to complex reactions relevant for energy conversion and energy storage.

The PhD project is being conducted at the Chair of Electrochemistry.

The PhD project is being conducted at the Junior Professorship of Battery Management Methods.

The project aims to improve the characterisation of silicon-containing anode materials for lithium-ion batteries through a holistic approach. By synthesising new composite materials, particularly Si-rGO composites, the performance and stability of the batteries will be optimised This will be achieved through the implementation of layered electrodes, which will then be electrochemically characterised using cycling, CV, differential capacitance analysis and impedance spectroscopy. In addition, physicochemical characterisation techniques such as SEM, TEM, FTIR, Raman, XRD, XPS and elemental analysis are used to gain a comprehensive insight into the structure and composition of the materials. The combination of these areas will provide insights into the de- and lithiation and degradation processes of the synthesised materials and electrodes, which will contribute to the further development of more powerful lithium-ion batteries.

The PhD project is being conducted at the Chair of Electrochemical Process Engineering.

Electrochemical flow reactors are used for energy storage, chemical production, or water treatment. A central challenge with such reactors is the degradation of the electrodes. To better understand the electrochemical processes at the electrode surface, kinetic Monte Carlo (KMC) simulations can be used. However, since KMC simulations are computationally intensive, machine learning (ML) models are to be developed in this project in collaboration with the Chair of Physical Chemistry V to efficiently approximate KMC simulations. These ML models will be integrated into multiscale models to simulate the processes flexibly and efficiently in electrochemical flow reactors.

The PhD project is being conducted at the Junior Professorship of Battery Management Methods.

The conflict between high charging rates and battery lifetime is still a challenge in the development of electric vehicles and power-tools. It is necessary to identify operating conditions that trigger degradation processes to be able to combine fast charging with a long battery lifetime. Therefore, non-invasive sensing techniques that monitor real-time dynamics within the battery are crucial. With Operando EIS or dynamic electrochemical impedance spectroscopy (DEIS), impedance data is recorded under charge or discharge to gain information about the battery under operation. By examining impedance anomalies, evidence of battery damage can be found during operation. This method should be used to develop a fast-charging control of lithium-ion batteries based on impedance signals.

The PhD project is being conducted at the Chair of Electrical Energy Systems.

Our project involves the design and development of advanced polymer-based solid/quasi-solid electrolyte materials for Sodium based batteries through a comprehensive approach involving materials design and characterisation, and electrochemical investigations.

The PhD project is being conducted at the Chair of Electrode Design for Electrochemical Energy Systems.

In the iron redox flow battery (IRFB), elemental iron is deposited on the negative electrode, which, together with the parasitic hydrogen evolution reaction (HER), leads to reduced charging efficiency. Promising results are expected with regard to the influence of various parameters, such as additives or the electrode structure, on iron deposition and hydrogen evolution. In cooperation with the Junior Professorship for Battery Management Methods, the experiment will be linked to the simulation in order to gain an even better understanding of processes in the battery and to systematically optimise these processes.

The doctoral project is being carried out at the Chair of Materials Process Engineering.

The PhD project is being conducted at the Chair of Ecological Resource Technology.

In case of overheating due to overcharging or a mechanical defect of lithium-ion batteries there is a safety risk due to the thermally unstable electrolyte. Contact with atmospheric oxygen or humidity leads to oxidation of the electrolyte and thus to heat generation, which starts a chain reaction known as thermal runaway. The battery separator as a passive, safety-relevant component in LIBs ensures the spatial separation of anode and cathode and thus prevents internal short circuits. As a temperature-stable alternative to state-of-the-art polymer separators, glass is to be used as separator material. High thermal and chemical resistance as well as good wettability with the battery electrolyte predestine glass for this application.
At Keylab Glass Technology, separators based on glass fibers and glass particles are produced and characterized using colloidal processes. In extensive electrochemical testing procedure, the performance and stability of the glass separators was proven in test cells. However, the higher density of glass reduces the gravimetric energy density of the battery cell, so that the focus of the current research is on reducing the thickness of the separator.

The PhD project is being conducted at the KeyLab Glass Technology.

The formation process is a complex, yet crucial step in the lithium-ion battery (LIB) manufactoring as it significantly impacts the LIBs performance and cost. The aim of the research project is to develop methods that enable a material-dependent design of the formation protocol. To this end, electrochemical and simulative methods are developed and deployed to improve process understanding. The focus is on multi-scale simulations, which combine electrochemical cell models with continuous SEI growth models, and atomstic Kinetic Monte Carlo models to extrapolate and analyse the impact of the formation, respectively. The concluding aim is to combine the experimental and simulative methods into a framework to enable an efficient methodology for multi-critical design of formation protocols.

The PhD project is being conducted at the Junior Professorship of Battery Management Methods.

This research project investigates the feasibility of using Powder Aerosol Deposition (PAD) to fabricate micrometer-thin, dense, and ion-conductive NaSICON (Sodium Super Ionic Conductor) membranes for next-generation sodium-based solid-state batteries (SSSBs). These batteries offer several advantages over traditional lithium-ion batteries, including the use of more abundant and environmentally friendly sodium and the potential for higher energy densities and improved safety due to the solid electrolyte. The project focuses on the optimization of process conditions and parameters for PAD-NaSICON membranes, rather than material development.

The project focuses on three key aspects: achieving dense, sodium-conducting NaSICON membranes using PAD, understanding the relationship between the resulting microstructure and achievable room-temperature ionic conductivity, and exploring the potential of moderate annealing to enhance conductivity and reduce interface resistance. Additionally, researchers aim to demonstrate the feasibility of constructing sodium-conducting cells entirely with PAD-fabricated functional layers. The ultimate goal is to assemble an all-solid-state sodium battery by sequentially depositing cathode and solid electrolyte layers via PAD and to utilize Na metal as anode.

The PhD project is being conducted at the Chair of Functional Materials.

In this work, a multiscale model is developed connecting different length and time scales. This model combines a kinetic Monte-Carlo model, a continuum model and a system-level model. The aim is to improve the understanding of processes such as the metallic deposition and detachment of iron and the parasitic hydrogen evolution and to develop solutions for existing challenges in the further development of hybrid iron redox flow batteries. In collaboration with the Chair of Materials Process Engineering, an experimental setup will be developed to combine the knowledge gained from both disciplines and to validate the simulation model.

The PhD project is being conducted at the Junior Professorship of Battery Management Methods.