Regensburg 2025 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Poster

KFM 14.9: Poster

Wednesday, March 19, 2025, 17:00–18:30, P1

Polycrystalline FeS as ultra-fast charging sodium-ion battery anode — •Zidong Wang and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Fast charging is considered a key development trend and a competitive advantage for sodium-ion battery (SIB) technology. Achieving fast-charging SIBs relies on developing electrode materials that combine high rate performance with excellent capacity retention. While iron sulfide, known for its high theoretical capacity, has shown potential, its fast-charging performance is hindered by poor rate performance due to volume expansion. Conventional approaches, such as compositing with carbon materials or adjusting the cut-off voltage, come with drawbacks*carbon composites reduce volumetric energy density, while cut-off voltage adjustments compromise capacity. Neither approach aligns well with practical applications. To address these challenges, we capitalized on the crystalline structural diversity of iron sulfides and successfully synthesized carbon-free polymorphic FeS. This material achieves high rate performance without relying on carbon additives or cut-off voltage adjustments, marking a significant step forward in SIB development. Impressively, anode demonstrates the best rate performance reported to date at an exceptionally high current density, achieving 236 mAh/g at 50 A/g.

Keywords: sodium-ion batteries; anode; FeS