Jump to main content
Jump to site search

Issue 9, 2018
Previous Article Next Article

Rhombohedral NASICON-type NaxFe2(SO4)3 for sodium ion batteries: comparison with phosphate and alluaudite phases

Author affiliations

Abstract

Sulfate has attracted considerable interest as an anion for cathode materials in lithium and sodium ion batteries because they induce high voltages. Herein, Fe2(SO4)3 in the rhombohedral NASICON phase was examined as a Na-ion cathode. Electrochemical, structural, and theoretical methods were employed. Starting from the charged state, Fe2(SO4)3 can be discharged to near theoretical capacity under very slow GITT experimental conditions. However, the available capacity rapidly dropped under high current. First-principles calculations found that one of the alkali metal sites was metastable and a high diffusion barrier of 0.9 eV for Na+ ion migration was found. The NASICON-type structure, with its open framework, is generally considered a good ionic conductor. However, the small size of SO42− anions limit the site availability and the mobility of Na+ ions in the NASICON phase of Fe2(SO4)3, which accounted for their inferior properties compared with the recently discovered alluaudite polymorph.

Graphical abstract: Rhombohedral NASICON-type NaxFe2(SO4)3 for sodium ion batteries: comparison with phosphate and alluaudite phases

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Sep 2017, accepted on 24 Jan 2018 and first published on 24 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08606G
Citation: J. Mater. Chem. A, 2018,6, 3919-3925
  •   Request permissions

    Rhombohedral NASICON-type NaxFe2(SO4)3 for sodium ion batteries: comparison with phosphate and alluaudite phases

    S. Chung, J. Ming, L. Lander, J. Lu and A. Yamada, J. Mater. Chem. A, 2018, 6, 3919
    DOI: 10.1039/C7TA08606G

Search articles by author

Spotlight

Advertisements