Na2Fe(C2O4)(HPO4): a promising new oxalate-phosphate based mixed polyanionic cathode for Li/Na ion batteries | Zendy

Atin Pramanik | Zendy; Alasdair J. Bradford | Zendy; Stephen Lee | Zendy; Philip Lightfoot | Zendy; A. Robert Armstrong | Zendy

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Na₂Fe(C₂O₄)(HPO₄): a promising new oxalate-phosphate based mixed polyanionic cathode for Li/Na ion batteries

Author(s) -

Atin Pramanik,

Alasdair J. Bradford,

Stephen Lee,

Philip Lightfoot,

A. Robert Armstrong

Publication year - 2021

Publication title -

journal of physics materials

Language(s) - English

Resource type - Journals

ISSN - 2515-7639

DOI - 10.1088/2515-7639/abe5f9

Subject(s) - oxalate , redox , cathode , iron phosphate , ion , phosphate , inorganic chemistry , hydrothermal circulation , materials science , electrode , chemistry , chemical engineering , organic chemistry , engineering

The new iron-based mixed polyanionic material Na 2 Fe(C 2 O 4 )(HPO 4 ) 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 Fe 2+/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.

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