Abstract

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.

Details

Title
Na2Fe(C2O4)(HPO4): a promising new oxalate-phosphate based mixed polyanionic cathode for Li/Na ion batteries
Author
Pramanik, Atin 1   VIAFID ORCID Logo  ; Bradford, Alasdair J 1   VIAFID ORCID Logo  ; Lee, Stephen L 2   VIAFID ORCID Logo  ; Lightfoot, Philip 1   VIAFID ORCID Logo  ; Armstrong, A Robert 1   VIAFID ORCID Logo 

1  School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, United Kingdom 
2  School of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom 
Publication year
2021
Publication date
Apr 2021
Publisher
IOP Publishing
e-ISSN
25157639
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1088/2515-7639/abe5f9
ProQuest document ID
2512981083
Copyright
© 2021. This work is published under http://creativecommons.org/licenses/by/4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.