Na2Fe(C2O4)(HPO4): a promising new oxalate-phosphate based mixed polyanionic cathode for Li/Na ion batteries. (25th February 2021)

• Record Type: Journal Article
• Authors: Pramanik, Atin; Bradford, Alasdair J; Lee, Stephen L; Lightfoot, Philip; Armstrong, A Robert
• Is Part Of: JPhys materials. Volume 4:Number 2(2021)
• Publication Date: 2021-02-25
• Subjects: Na2Fe(C2O4)(HPO4) -- oxalate-phosphate mixed polyanion -- sodium-ion battery -- lithium-ion battery -- cathode; Solid state physics -- Periodicals; Materials science -- Periodicals; 530.41
• DOI: 10.1088/2515-7639/abe5f9
• Languages: English
• ISSNs: 2515-7639

Abstract

Abstract: The new iron-based mixed polyanionic material Na2 Fe(C2 O4 )(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 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.