Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.106
Publication date: 16th December 2024
All-solid-state batteries are identified as the next generation of batteries. The advantage of these technologies lies in the solid nature of the electrolyte, which could enhance safety and energy density of the systems. The current state of the art is still far from the anticipated expectations, and ongoing studies identify several challenges responsible for this gap. Firstly, all-solid-state technology requires careful management of the pressure applied. It must take into account the mechanical properties of the components and be adapted to ensure good ionic conductivity1. Secondly, the fabrication of components must be homogeneous in composition and densification. The distribution and contact of active material and electrolyte particles are fundamental to achieving the expected capacity. Finally, these materials must be chemically and electrochemically compatible to avoid accelerated degradation of the system2. In our research, we aim to develop all-solid-state prototype references through the coating process. The objective is to study the performance during prolonged cycling and to investigate the failures mechanisms. Optimization of formulations, processes, and cycling conditions has enabled us to achieve five-centimeter-square pouch-cell format prototypes with reproducible performance over several hundred cycles. The electrochemical test was conducted at a low current density of 70 µA·cm⁻² under 60°C with a relatively low pressure of 3 MPa. The work presented will focus on the development of prototypes. The design of the separator, with a thickness of 400 µm obtained by coating, will be particularly detail, as it is the critical component of this technology3. The use of the coating process creates porosity during the solvent evaporation step. This porosity is not suitable because it could affect ionic conductivity and create preferential pathways for lithium dendrite growth. However, the main advantage of this process is that it is widely known and used in current battery manufacturing plants. Therefore, the transition to all-solid-state battery production would be facilitated and accelerated. In this presentation, various optimizations and strategies to overcome the porosity issues will also be discussed.
This research was made possible thanks to the financial support and institutional resources provided by the CEA-LITEN Institute (Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Innovation pour les Technologies des Énergies Nouvelles et les Nanomatériaux). I would also like to acknowledge the invaluable contributions of Manon Berthault and Jean-François Colin, my supervisors, for their continuous guidance and encouragement.
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