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Sodium intercalation in the phosphosulfate cathode NaFe2(PO4)(SO4)2

Authors :
Khalid Boulahya
Hamdi Ben Yahia
Ruhul Amin
Rachid Essehli
Ilias Belharouak
Toyoki Okumura
Source :
Journal of Power Sources. 382:144-151
Publication Year :
2018
Publisher :
Elsevier BV, 2018.

Abstract

The compound NaFe2(PO4)(SO4)2 is successfully synthesized via a solid state reaction route and its crystal structure is determined using powder X-ray diffraction data. NaFe2(PO4)(SO4)2 phase is also characterized by cyclic voltammetry, galvanostatic cycling and electrochemical impedance spectroscopy. NaFe2(PO4)(SO4)2 crystallizes with the well-known NASICON-type structure. SAED and HRTEM experiments confirm the structural model, and no ordering between the PO4−3 and SO4−2 polyanions is detected. The electrochemical tests indicate that NaFe2(PO4)(SO4)2 is a 3 V sodium intercalating cathode. The electrical conductivity is relatively low (2.2 × 10−6 Scm−1 at 200 °C) and the obtained activation energy is ∼0.60eV. The GITT experiments indicate that the diffusivity values are in the range of 10−11-10−12 cm2/s within the measured sodium concentrations.

Details

ISSN :
03787753
Volume :
382
Database :
OpenAIRE
Journal :
Journal of Power Sources
Accession number :
edsair.doi...........d440c756a225b12a8ed7693018743dce
Full Text :
https://doi.org/10.1016/j.jpowsour.2018.02.021