KFe(C2O4)F: a fluoro-oxalate cathode material for Li/Na-ion batteries

Atin Pramanik, Alexis G. Manche, Megan T. Smeaton, Moulay-Tahar Sougrati, Philip Lightfoot, Anthony Robert Armstrong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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The iron-based polyanionic fluoro-oxalate material, KFe(C2O4)F (KFCF), has been synthesized by hydrothermal methods. This compound shows promising reversible lithium and sodium insertion properties as a cathode material. The material delivered a first-cycle discharge capacity of 120 mAh g-1 at ∼3.3 V (Li+/Li) and 97.4 mAh g-1 at ∼3.0 V (Na+/Na) in LIB and NIB, respectively. Stable cycling performance was observed in both cases. The involvement of reversible Fe2+/Fe3+ redox was confirmed by ex-situ Mössbauer spectroscopy supported by first-principles calculations. This study reveals promising performance from a mixed oxalate-fluoride based polyanionic material thereby opening up further possibilities for materials discovery in the design of new electrode materials.
Original languageEnglish
Article numbere202300192
Number of pages8
Issue number14
Early online date26 Jun 2023
Publication statusPublished - 17 Jul 2023


  • Cathode materials
  • Electrochemistry
  • Na-ion/Li-ion
  • Oxalate
  • Rechargeable battery


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