K2Fe(C2O4)2: an oxalate cathode for Li/Na ion batteries exhibiting a combination of multielectron cation and anion redox

Atin Pramanik, Alexis G. Manche, Moulay Tahar Sougrati, Alan Chadwick, Philip Lightfoot*, Robert Armstrong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The development of multielectron redox-active cathode materials is a top priority for achieving high energy density with long cycle life in the next-generation secondary battery applications. Triggering anion redox activity is regarded as a promising strategy to enhance the energy density of polyanionic cathodes for Li/Na-ion batteries. Herein, K2Fe(C2O4)2 is shown to be a promising new cathode material that combines metal redox activity with oxalate anion (C2O42–) redox. This compound reveals specific discharge capacities of 116 and 60 mAh g–1 for sodium-ion batterie (NIB) and lithium-ion batterie (LIB) cathode applications, respectively, at a rate of 10 mA g–1, with excellent cycling stability. The experimental results are complemented by density functional theory (DFT) calculations of the average atomic charges.
Original languageEnglish
Pages (from-to)2600-2611
Number of pages12
JournalChemistry of Materials
Volume35
Issue number6
Early online date13 Mar 2023
DOIs
Publication statusPublished - 28 Mar 2023

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