Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.436
Publication date: 16th December 2024
Multivalent (Mg, Ca, Al) metal anodes offer promising gravimetric and volumetric capacities and are a promising option for future high energy density batteries based on sustainable materials. However, their practical application is severely limited by the difficulty of ion insertion, slow diffusion and the presence of side reactions during electrochemical operation. Organic cathodes, with their relatively soft and adaptable structures, offer an alternative to overcome the limitations of inorganic hosts.[1]
In our work we combine organic compounds with different multivalent non-nucleophilic electrolytes. We started our work with polymers from anthraquinone class, which fit well into the electrochemical stability window of multivalent electrolytes due to their moderate working potential. The long-term cycling stability in combination with insoluble organic polymers and suitable non-nucleophilic electrolytes reaches several hundred cycles. However, there are still some challenges in terms of capacity utilisation and cycling stability that need to be addressed. We aim to improve our understanding of these challenges by analysing the electrochemical mechanism in detail using electrochemical impedance analysis and ex-situ electron microscopy, which reveal limitations in the transport of multivalent ions within the active materials.[2] At the same time, we also focus on the development of active compounds with higher energy density, either through increased capacity or redox potential.[3]
Author would like to thank the Slovenian Research and Innovation Agency (ARIS) for financial support through the research program P2-0243 and the research projects J2-4462 and N2-0279.
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