articleJournal of the American Chemical SocietyApr 21, 2025Closed access

Unlocking Phase Purity of Sodium Iron Sulfate for Low-Cost and High-Performance Sodium-Ion Batteries

CLChangyu LiuKCKean ChenFLFumin LiAZAlong ZhaoPLPing Liu

Wuhan University · Henan Academy of Sciences · +1 more institution

PubMed
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Abstract

The alluaudite-type sulfate Na2Fe2(SO4)3 has gained significant attention as a promising cathode material for sodium-ion batteries (SIBs). However, the inevitable formation of impurities during synthesis and the irreversible structural distortion caused by Fe–Na exchange during electrochemical reactions severely hinder its electrochemical performance. Herein, we tackle these challenges by engineering an enlarged Fe–Fe distance in the lattice through partial PO43– substitution. This strategic modification significantly alleviates the Coulombic repulsion between Fe ions and effectively prevents Fe-migration during the electrochemical reaction. Moreover, the unique ion state within the structure ensures enhanced…

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45
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Authors

8

Topics & keywords

Topics
Keywords
  • Chemistry
  • Sodium
  • Ion
  • Phase (matter)
  • Sulfate
  • Sodium sulfate
  • Inorganic chemistry
  • Organic chemistry
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