Na2Fe(C2O4)F2 : a new iron-based polyoxyanion cathode for Li/Na ion batteries

Yao, Wenjiao; Sougrati, Moulay-Tahar; Hoang, Khang; Hui, Jianing; Lightfoot, Philip; Armstrong, A. Robert

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Date

14/03/2017

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Abstract

A new mixed anion compound, Na2Fe(C2O4)F2 has been prepared by hydrothermal synthesis. The crystal structure exhibits infinite chains of corner-linked FeII-centred octahedra, with coordination composed of both oxalate and fluoride ligands. This compound exhibits promising reversible lithium and sodium insertion. On extended cycling, Na2Fe(C2O4)F2 is capable of reversibly inserting 0.67 Li+ or 0.56 Na+ per formula unit up to 50 cycles at the average discharge voltages of 3.3 V and 3.0 V, respectively. This represents arguably the best performance as a prospective cathode material so far observed amongst oxalates, and is comparable to many known iron phosphate-based cathode materials.

Citation

Yao , W , Sougrati , M-T , Hoang , K , Hui , J , Lightfoot , P & Armstrong , A R 2017 , ' Na 2 Fe(C 2 O 4 )F 2 : a new iron-based polyoxyanion cathode for Li/Na ion batteries ' , Chemistry of Materials , vol. 29 , no. 5 , pp. 2167-2172 . https://doi.org/10.1021/acs.chemmater.6b04859

Publication

Chemistry of Materials

Status

Peer reviewed

DOI

https://doi.org/10.1021/acs.chemmater.6b04859

ISSN

0897-4756

Type

Journal article

Rights

Copyright © 2017 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1021/acs.chemmater.6b04859

Description

W.Y. thanks the Royal Society for the award of a Newton International Fellowship (140881). Work at North Dakota State University (NDSU) was supported by the U.S. Department of Energy Grant No. DE-SC0001717 and by NDSU's Center for Computationally Assisted Science and Technology.

Collections

University of St Andrews Research

URI

http://hdl.handle.net/10023/12699