J. Mater. Sci. Technol. ›› 2025, Vol. 227: 315-321.DOI: 10.1016/j.jmst.2024.11.075

• Research article • Previous Articles    

Electronic coupling effect optimized FeOOH nanosheets to enable high-performance Ni-Fe battery

Fan Yanga, Ruiwang Zhanga, Xunwei Jia, Shiwei Lina,*, Xihong Lub,*   

  1. aState Key Laboratory of Marine Resource Utilization in South China Sea & School of Materials Science and Engineering, Hainan University, Haikou 570228, China;
    bThe Key Lab of Low-carbon Chem & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2024-10-08 Revised:2024-11-18 Accepted:2024-11-21 Online:2025-01-23
  • Contact: *E-mail addresses: linsw@hainanu.edu.cn (S. Lin), luxh6@mail.sysu.edu.cn (X. Lu).

Abstract: Aqueous rechargeable Ni-Fe batteries exhibit unique advantages in large-scale energy storage thanks to their affordability, safety, and reliability. However, their limited energy density and Coulombic efficiency stem from unfavorable OH- adsorption capability and low electrochemical activity of Fe sites, result in electrode kinetic delays for Fe anodes. Here, we report Mn and S co-modified FeOOH (MSFF) nanosheets as an advanced anode in Ni-Fe batteries, synthesized from a facile one-step surface-redox-etching method at room temperature. Based on the strong electronic coupling effect between Mn and S atoms, such MSFF anode presents fast electron transport capability, enhanced OH--adsorption capability, and redox reactivity. Specifically, the MSFF anode can achieve a high areal capacity of 2 mAh cm-2 at 10 mA cm-2, which retains a staggering 96 % of the initial capacity after undergoing 9000 cycles at a higher current density of 30 mA cm-2. In addition, the assembled Ni-Fe battery can provide a capacity of 0.85 mAh cm-2 at 16 mA cm-2, significantly outperforming most recently reported aqueous rechargeable batteries. This work may offer an innovative and feasible approach for modulating the local electronic structure of high-performance Ni-Fe battery electrode materials.

Key words: Electronic coupling effect, Mn, S co-modified FeOOH, Fe anode, Ni-Fe battery