Soutenance publique de thèse de doctorat en Sciences chimiques - Xikun Zhang

Designing High Performance Sodium-based Dual-ion Battery

Jury

• Dr Luca FUSARO (UNamur), Président
• Prof. Bao-Lian SU (UNamur), Secrétaire
• Prof. Alexandru VLAD (UCLouvain)
• Dr Nikolay TUMANOV (UNamur)
• Prof. Li YU (Wuhan University of Technology)
• Dr Amanda KALE (UNamur)
• Prof. Alain KRIEF (UNamur)

Abstract

Sodium-based dual-ion batteries (SDIBs) have garnered increasing attention as a next-generation energy storage technology, owing to their high operating voltage, cost-effective raw materials, and environmentally friendly characteristics. These features position SDIBs as a compelling alternative to conventional lithium-ion batteries, particularly for large-scale applications. Despite significant progress in improving energy density and cycling stability, several critical challenges remain—most notably, the development of durable electrode materials and the formulation of electrolytes that are both efficient and compatible with the dual-ion mechanism. This thesis provides an overview of SDIBs, which store energy through the simultaneous insertion of sodium ions into the anode and anions into the cathode. This dual-ion mechanism enables high operating voltages but also introduces challenges such as electrode degradation due to volume changes during cycling. To improve performance, the paper emphasizes the importance of selecting and engineering suitable electrode materials. For the anode, introducing cation defects enhances conductivity, surface area, and ion diffusion. For the cathode, pre-intercalation engineering helps maintain structural integrity during repeated charge and discharge cycles. Several SDIB systems are discussed, each demonstrating how careful material design can improve structural stability and electrochemical reversibility. The findings underscore that stable and reversible ion storage in both electrodes is critical for achieving long cycle life and high performance, offering promising insights for the future development of advanced SDIB technologies.

 

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