Strategic Additive Design for Optimizing Sodium-Ion Battery Performance

Le résumé fourni par la source

Sodium-ion batteries (SIBs) have gained significant attention as a cost-effective alternative to lithium-ion batteries (LIBs) due to the greater abundance and availability of sodium in the Earth's crust. Additionally, SIBs offer several advantages over LIBs, including an improved operating temperature range, faster charging capabilities—leveraging the enhanced kinetics of Na⁺ storage in hard carbon anodes—and the ability to be fully discharged and stored at zero volts, simplifying transportation and reducing the risk of thermal runaway. Despite these benefits, SIBs are limited by their lower energy density compared to LIBs, necessitating further research to enhance their performance. Achieving energy capacities comparable to LIBs requires the use of higher-voltage cathodes; however, this introduces instability within the electrolyte, highlighting the need for extensive research into SIB electrolytes and their optimization. In this poster presentation, I will discuss the influence of various additives on the electrochemical performance of SIBs. Due to the disordered structure and uneven surface of hard carbon anodes, low initial coulombic efficiency (ICE) has emerged as a major challenge, as passivation leads to irreversible capacity loss during the first cycle. By incorporating different additives at varying concentrations to facilitate the formation of a stable, thin solid electrolyte interphase (SEI), ICE can be improved, resulting in a higher reversible sodium capacity. Furthermore, the composition and concentration of these additives play a crucial role in SEI formation, directly impacting the cycling stability of the cell. An SEI with low impedance enhances Na⁺ transport, minimizes sodium ion loss, and ensures high capacity retention over long-term cycling. Through a strategic analysis of various additives and their concentrations, this study aims to deepen the understanding of additive behaviors, ultimately guiding the development of optimized electrolytes that enhance SEI stability on both the anode and cathode, leading to improved overall SIB performance.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.