Na2Fe(C2O4)F2 : a new iron-based polyoxyanion cathode for Li/Na ion batteries
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A new mixed anion compound, Na2Fe(C2O4)F2 has been prepared by hydrothermal synthesis. The crystal structure exhibits infinite chains of corner-linked FeII-centred octahedra, with coordination composed of both oxalate and fluoride ligands. This compound exhibits promising reversible lithium and sodium insertion. On extended cycling, Na2Fe(C2O4)F2 is capable of reversibly inserting 0.67 Li+ or 0.56 Na+ per formula unit up to 50 cycles at the average discharge voltages of 3.3 V and 3.0 V, respectively. This represents arguably the best performance as a prospective cathode material so far observed amongst oxalates, and is comparable to many known iron phosphate-based cathode materials.
Yao , W , Sougrati , M-T , Hoang , K , Hui , J , Lightfoot , P & Armstrong , A R 2017 , ' Na 2 Fe(C 2 O 4 )F 2 : a new iron-based polyoxyanion cathode for Li/Na ion batteries ' Chemistry of Materials , vol 29 , no. 5 , pp. 2167-2172 . DOI: 10.1021/acs.chemmater.6b04859
Chemistry of Materials
Copyright © 2017 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1021/acs.chemmater.6b04859
W.Y. thanks the Royal Society for the award of a Newton International Fellowship (140881). Work at North Dakota State University (NDSU) was supported by the U.S. Department of Energy Grant No. DE-SC0001717 and by NDSU's Center for Computationally Assisted Science and Technology.
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