Deep Green

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    Adapting e-Genius for next-level efficient electric aerotow with high-power propulsion and automatic flight control system
    (2025) Zistler, Stefan; Shi, Dalong; Fichter, Walter; Strohmayer, Andreas
    Aiming to reduce energy demand and carbon footprint, minimize noise impact, and enhance flight safety and efficiency during aerotow operations, this study integrates an electric propulsion system and an automatic flight control system (AFCS) into the electric research aircraft e-Genius. An advanced propulsion system is developed using high-performance batteries and available electric drive components, while the AFCS is designed following a systematic process of developing flight control algorithms. Flight tests are then conducted to evaluate the performance of individual components and the overall system. The test results demonstrate that the upgraded propulsion system provides sufficient power to launch sailplanes, even with the maximum takeoff mass, while significantly reducing energy demand when compared to contemporary fossil fueled towplanes. Additionally, the AFCS proves to be stable and robust, successfully following specified commanded states, executing path tracking, and performing aerotow operations.
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    Impact of the sulfurized polyacrylonitrile cathode microstructure on the electrochemical performance of lithium-sulfur batteries
    (2025) Moschner, Robin; Gerle, Martina; Danner, Timo; Simanjuntak, Esther Kezia; Michalowski, Peter; Latz, Arnulf; Nojabaee, Maryam; Kwade, Arno; Friedrich, K. Andreas
    The growing demand for advanced energy storage systems requires the development of next‐generation battery technologies with superior energy density and cycle stability, with lithium-sulfur (Li-S) batteries representing a promising solution. Sulfur‐containing polyacrylonitrile cathodes (SPAN) for Li-S batteries are a significant advancement for this next‐generation battery chemistry, addressing the major issue of limited cycle life encountered in conventional carbon/sulfur composite cathodes. In the presented study, the influence of available ionic and electronic conduction pathways within the cathode on the electrochemical performance of SPAN‐based Li-S batteries is studied in details. To this end, a series of SPAN cathodes with different microstructures is prepared by adapting the compression degree of calendering. Mechanical and morphological characterizations confirm a pronounced springback effect due to a characteristic elastic deformation behavior of SPAN. Electrochemical impedance spectroscopy (EIS) shows increased cathode impedance values with multiple overlapping processes in the high‐ to mid‐frequency region in highly compressed SPAN cathodes. Moreover, while the (first) discharge capacity is unaffected, the subsequent charge capacity decreases substantially for highly compressed cathodes. The electrochemical experiments and electrochemical continuum simulations confirm that this phenomenon is mainly due to the disturbance of the electronic percolation pathways caused by the springback behavior during calendering.