Na2Fe(C2O4)(HPO4) : a promising new oxalate-phosphate based mixed polyanionic cathode for Li/Na ion batteries
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The new iron-based mixed polyanionic material Na2Fe(C2O4)(HPO4) has been synthesized by a hydrothermal technique. The compound contains four Na sites with a three-dimensional crystal structure. This compound shows promising reversible Li and Na insertion properties as a cathode material. The redox potentials observed were ~3.2 V (vs Li+/Li) for the Li-ion cell and ~3.1 V (vs Na+/Na) for the Na-ion cell with Fe2+/3+ redox reactions. The reversible electrode operation was found to deliver 71 and 104 mAh g−1 specific capacities in Li and Na half cells, respectively. This present study reveals promising performance from a mixed oxalate-phosphate based polyanionic material and opens up further possibilities for materials discovery.
Pramanik , A , Bradford , A J , Lee , S , Lightfoot , P & Armstrong , R 2021 , ' Na 2 Fe(C 2 O 4 )(HPO 4 ) : a promising new oxalate-phosphate based mixed polyanionic cathode for Li/Na ion batteries ' , Journal of Physics: Materials , vol. 4 , no. 2 , 024004 . https://doi.org/10.1088/2515-7639/abe5f9
Journal of Physics: Materials
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DescriptionThe authors thank EPSRC EP/R030472/1 for financial support.
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