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Design and Investigation of Cathode Materials for Rechargeable Calcium Ion Batteries by Da TIE -
Jeudi 13/03/2025 à 16h30 - Auditoire BARB12 - Place Sainte Barbe - 1348 Louvain-la-Neuve -
Calcium-ion batteries (CIBs) have gained increasing attention as a promising alternative to lithium-ion batteries (LIBs) due to the abundance, low cost, and favorable redox potential of calcium. However, the practical application of CIBs remains limited by the lack of high-performance cathode materials and challenges associated with sluggish calcium-ion diffusion and high polarization. This thesis investigates the design, synthesis, and electrochemical evaluation of novel cathode materials for CIBs, focusing on CaCoSO, amorphous iron fluorophosphate, and layered NaV0.5Ti0.5S2. Each of these materials presents unique advantages and challenges in calcium storage.
CaCoSO exhibits irreversible electrochemical activity, which is closely related to its structural stability. The underlying side reactions in CIBs are thoroughly investigated to understand their impact on electrochemical performance. In contrast, amorphous iron fluorophosphate is further explored as a cathode material with improved structural resilience and long-term stability. Additionally, layered NaV0.5Ti0.5S2 is studied for its potential to facilitate calcium intercalation while minimizing phase transitions that often degrade performance. Comparative electrochemical studies highlight key factors influencing calcium storage, including ion diffusion barriers, structural integrity, and electrolyte compatibility.
Despite progress, calcium storage in cathode materials still faces fundamental obstacles, particularly in achieving high-capacity retention and efficient charge transfer. This thesis provides insights into the underlying mechanisms governing calcium-ion intercalation and outlines strategies to improve cathode performance, such as optimizing material composition and exploring alternative synthesis methods. The findings contribute to the ongoing development of CIBs and offer a foundation for future research aimed at overcoming the remaining challenges in calcium-based energy storage systems.
Jury members :
Prof. Alexandru Vlad (UCLouvain)(Supervisor)
Prof. Eric Gaigneaux (UCLouvain) (Chairperson)
Prof. Jean-François Gohy (UCLouvain) (Secretary)
Prof. Yann Garcia (UCLouvain)
Prof. Yaroslav Filinchuk (UCLouvain)
Prof. Jiajia Chen (Xiamen University, China)
Prof. Mesfin Haile Mamme (Vrije Universiteit Brussel)
Pay attention : the public defense of Da TIE will also take place in the form of a videoconference
