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Publication in Nature Communication

Data-driven capacity estimation of commercial lithium-ion batteries from voltage relaxation

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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BMBF Forschungsprojekt

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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Nature Journal Publication

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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Publication in Advanced Materials

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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Highlighting research by Hannes Radinger and Dr. Frieder Scheiba from the Karlsruhe Institute of Technology (KIT).

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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Besuch beim IAM-ESS

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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