Facilitating Sodium-Ion Diffusion in Fe-Doped Co3O4 for High-Rate Performance
- authored by
- 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 (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 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 FexCo3-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.
- Organisation(s)
-
Institute of Inorganic Chemistry
- External Organisation(s)
-
Ilmenau University of Technology
Jiangnan University
University of the Chinese Academy of Sciences (UCAS)
- Type
- Article
- Journal
- SMALL
- ISSN
- 1613-6810
- Publication date
- 28.02.2025
- Publication status
- E-pub ahead of print
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Biotechnology, General Chemistry, Biomaterials, General Materials Science, Engineering (miscellaneous)
- Electronic version(s)
-
https://doi.org/10.1002/smll.202412449 (Access:
Open)
