Regensburg 2025 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 13: Holistic Structural and Safety Assessment of Lithium-ion and Post-Lithium Cells and their Materials (Experimental Characterisation and Safety Testing)

KFM 13.4: Vortrag

Mittwoch, 19. März 2025, 15:45–16:00, H9

Facilitating Sodium-Ion Diffusion in Fe-Doped Co3O4 for High-Rate Performance — •Yonghuan Fu, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Due to its high theoretical capacity, cobalt oxide (Co3O4) has attracted attention to sodium-ion battery (SIB) anodes. However, its low conductivity and poor rate performance have limited its practical application. This work proposes a co-precipitation doping strategy to synthesize iron-doped Co3O4 nanoparticles (FexCo3-xO4 NPs). Both experimental and theoretical results confirm that iron (Fe) doping at octahedral sites within spinel structures is a critical factor in enhancing rate performance. The decreased band gap and enlarged ion transport spacing originate in Fe doping. This effectively facilitates the electron and Na+ transport during discharge/charge processes, delivering an impressive rate capability of 402.9 mA h g-1 at 3 A g-1. The FexCo3-xO4 NPs demonstrate remarkable cycling stability. They maintain a high specific capacity of 786.2 mA h g-1 even after 500 cycles at 0.5 A g-1, with no noticeable capacity fading. This work provides valuable insights into the functional design of high-rate electrodes, offering a promising approach to addressing the critical challenges faced by sodium anodes.

Keywords: Iron-doped Co3O4; Sodium-ion diffusion; High-rate performance; High electronic conductivity; Transport spacing