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<p>Owing to the natural abundance of sodium, sodium-ion batteries (SIBs) serve as a more cost-effective option compared with lithium-ion batteries (LIBs), while offering comparable energy storage capabilities. This study presents the compositional optimizations, structural characterizations, and electrochemical performance of a new mixed sodium (Na) superionic conductor (NASICON)-type polyanionic material, NaFe<sub>2</sub>PO<sub>4</sub>(SO<sub>4</sub>)<sub>2</sub> (NFPS). Subsequently, the introduction of Ni<sup>2+</sup> doping serves to simultaneously improve the structural integrity and electronic conductivity of the material, leading to a collective enhancement of the sodium-ion diffusion channels. The Ni<sup>2+</sup>-incorporated phase, NaFe<sub>1.92</sub>Ni<sub>0.08</sub>PO<sub>4</sub>(SO<sub>4</sub>)<sub>2</sub>, exhibits faster Na<sup>+</sup> diffusion, resulting in superior rate and cycling performance versus NFPS. After 80 cycles at 25&#xa0;mA&#xa0;g<sup>−1</sup>, NFPS-Ni<sub>0.08</sub> maintains a discharge capacity of 58.7&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup>, outperforming undoped NFPS by 20%.</p>

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Improved Electrochemical Reaction of Ni2+-Incorporated NaFe2PO4(SO4)2 as a Cathode Material for Sodium-Ion Batteries

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Yao Liu,
  • Yilei Sun,
  • Haixia Wang,
  • Zeda Meng,
  • Jae Doc Na,
  • Won-Chun Oh

摘要

Owing to the natural abundance of sodium, sodium-ion batteries (SIBs) serve as a more cost-effective option compared with lithium-ion batteries (LIBs), while offering comparable energy storage capabilities. This study presents the compositional optimizations, structural characterizations, and electrochemical performance of a new mixed sodium (Na) superionic conductor (NASICON)-type polyanionic material, NaFe2PO4(SO4)2 (NFPS). Subsequently, the introduction of Ni2+ doping serves to simultaneously improve the structural integrity and electronic conductivity of the material, leading to a collective enhancement of the sodium-ion diffusion channels. The Ni2+-incorporated phase, NaFe1.92Ni0.08PO4(SO4)2, exhibits faster Na+ diffusion, resulting in superior rate and cycling performance versus NFPS. After 80 cycles at 25 mA g−1, NFPS-Ni0.08 maintains a discharge capacity of 58.7 mA h g−1, outperforming undoped NFPS by 20%.