Open AccessNa2Fe(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 -
jphys 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 , materials science , hydrothermal circulation , electrode , inorganic chemistry , 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.