Journal
CHEMISTRY OF MATERIALS
Volume 29, Issue 5, Pages 2167-2172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b04859
Keywords
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Funding
- Royal Society [140881]
- U.S. Department of Energy [DE-SC0001717]
- NDSU's Center for Computationally Assisted Science and Technology
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A new mixed anion compound, Na2Fe(C2O4)F-2, has been prepared by hydrothermal synthesis. The crystal structure exhibits infinite chains of corner-linked Fe-II -centered octahedra, with coordination composed of both oxalate and fluoride ligands. This compound exhibits promising reversible lithium and sodium insertion. On extended cycling, Na2Fe(C2O4)F-2 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 and 3.0 V, respectively. This represents arguably the best performance as a prospective cathode material so far observed among oxalates and is comparable to many known iron phosphate-based cathode materials.
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