Facilitating Sodium-Ion Diffusion in Fe-Doped Co₃O₄ for High-Rate Performance

verfasst von

Yonghuan Fu, Guowei Sun, Rene Lucka, Qijun Song, Franz Renz, Huaping Zhao, Zhijie Wang, Yong Lei

Abstract

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 (Fe_xCo_3-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 bandgap and enlarged ion transport spacing originate in Fe doping. This effectively facilitates the electron and Na-ion (Na⁺) transport during discharge/charge processes, delivering an impressive rate capability of 402.9 mAh g⁻¹ at 3 A g⁻¹. The Fe_xCo_3-xO₄ NPs demonstrate remarkable cycling stability. They maintain a high specific capacity of 786.2 mAh g⁻¹ even after 500 cycles at 0.5 A g⁻¹, with no noticeable capacity fading. When assembled into a Na-ion full cell, a remarkable discharge capacity of 105 mAh g⁻¹ with stable cycling performance is attained. 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.

Organisationseinheit(en)

Institut für Anorganische Chemie

Externe Organisation(en)

Technische Universität Ilmenau
Jiangnan University
Graduate University of Chinese Academy of Sciences

Typ

Artikel

Journal

SMALL

ISSN

1613-6810

Publikationsdatum

28.02.2025

Publikationsstatus

Elektronisch veröffentlicht (E-Pub)

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Biotechnologie, Allgemeine Chemie, Biomaterialien, Allgemeine Materialwissenschaften, Ingenieurwesen (sonstige)

Elektronische Version(en)

https://doi.org/10.1002/smll.202412449 (Zugang: Offen)