The IAM-ESS
The Institute for Applied Materials - Energy Storage Systems at KIT deals with the production of novel materials for energy storage, such as for Li-ion batteries and post-lithium systems, as well as the research in the processes involved in energy storage, the manufacture and testing of electrodes and cells.
The institute is also part of the Institute for Inorganic Chemistry: Materials Research for Novel Energy Storage Systems (AK Ehrenberg).
In addition to the laboratory equipment required for research, the institute also has access to large scale research facilities such as neutron and synchrotron radiation sources. In cooperation with these facilities, the institute develops in-situ and in-operando techniques to investigate specific aspects in materials as well as complete, commercial devices.
To increase the efficiency of energy storage systems for applications in wind and solar energy or in the field of electromobility a long service life of storage systems is required. It is, therefore, important to study mechanisms of aging and degradation in order to develop lifespan models as accurate as possible. The investigations are carried out both, in-situ and post-mortem. Starting with the material analysis to setting up of models, the institute cooperates with partners from industry and other research institutes. Further points of interest of the institute are the development of new materials and storage systems, the investigation of so-called redox flow storage devices and the development of methods for the efficient investigation of entire components under in-operando conditions. The manufacture of electrodes and cells are also a part of research, as well as material development for fusion research.
Data-driven capacity estimation of commercial lithium-ion batteries from voltage relaxation
(Article was selected as one of Editors' Highlights in section Energy: https://www.nature.com/collections/dmmhtcypsc)Accurate capacity estimation is crucial for the reliable and safe operation of lithium-ion Batteries. Researchers from Tongji University and KIT in cooperation with other institutes have investigated the possibility to use relaxation voltage curves of commercial cells to estimate the capacity. This way no additional cycling information and no complete charge/discharge cycle is required to determine the residual capacity. Statistical features derived from relaxation curves were compared with three different models and then used to estimate residual capacity of the cells.
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MEFBatt: Pilotanlage zur Massenproduktion von Elektroden für Festkörperbatterien am KIT
Im BMBF geförderten Forschungsprojekt MEFBatt („Aufrüstung einer Mehrlagen-Elektrodenfertigung zur Prozessierung von Festkörper-Batterien im Pilotmaßstab“) wird am IAM-ESS des KIT der nächste Schritt zur Massenproduktion ermöglicht. Mit einer Pilotanlage soll der Fertigungsprozess von Elektroden für Festkörperbatterien zur Vorbereitung einer industriellen Massenproduktion erforscht und optimiert werden.
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Closing the yellow gap with Eu- and Tb‑doped GaN: one luminescent host resulting in three colours
The invention of highly efficient blue-emitting diodes was a milestone for the development of today's omnipresent white LEDs being enabled by the investigations of Nakamura et al., who were awarded the Nobel prize in 2014. Here we demonstrate the doping of bulk GaN with europium, terbium and the combination of both resulting in intriguing luminescence properties, pushing the role of GaN:Eu,Tb as a chief component in future light emitting diodes. This colour tuning proves that one luminescence host can provide three colours (red, green and orange) and that even the so called “yellow gap” could be closed with a III-nitride.
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Lithium-Diffusion Induced Capacity Losses in Lithium-Based Batteries
In the Review "Lithium-Diffusion Induced Capacity Losses in Lithium-Based Batteries" published in Advanced Materials, scientists at the Institute and Uppsala University (Sweden) describe a new, so far largely unrecognized, capacity loss mechanism found in lithium-based batteries. The so called “Li-trapping” mechanism is, unlike other previously described capacity loss mechanisms, reversible which opens the possibility for regeneration of cycled batteries.
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Origin of the catalytic activity at graphite electrodes in vanadium flow batteries
It is shown that graphitic defects and not oxygen functional groups are responsible for lowering the activation energy barrier for the charge transfer process in vanadium flow batteries by thermal deoxygenation of graphite felt electrodes. These electrodes show superior cycling performance and stability.
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Der Europaabgeordnete der Grünen, Malte Gallée, informierte sich am KIT über die Forschung zur Lithiumförderung aus Thermalwässern sowie über aktuelle Entwicklungen in der Batterieforschung (2022/02)
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