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

Hamdi Ben Yahia; Rachid Essehli; Ruhul Amin; Khalid Boulahya; Toyoki Okumura; Ilias Belharouak

doi:10.1016/j.jpowsour.2018.02.021

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

Hamdi Ben Yahia, Rachid Essehli, Ruhul Amin, Khalid Boulahya, Toyoki Okumura, Ilias Belharouak

Electrification and Energy Infrastructur

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

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.

Original language	English
Pages (from-to)	144-151
Number of pages	8
Journal	Journal of Power Sources
Volume	382
DOIs	https://doi.org/10.1016/j.jpowsour.2018.02.021
State	Published - Apr 1 2018

Funding

The authors thank Qatar Foundation for the financial support allocated to the field of energy storage. They also thank the Center for Advanced Materials (CAM) in Qatar University for carrying out experiments.

Keywords

Conductivity
Diffusivity
HRTEM
Nasicon
Phosphosulfate
Sodium batteries

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10.1016/j.jpowsour.2018.02.021

Cite this

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title = "Sodium intercalation in the phosphosulfate cathode NaFe2(PO4)(SO4)2",

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.",

keywords = "Conductivity, Diffusivity, HRTEM, Nasicon, Phosphosulfate, Sodium batteries",

author = "{Ben Yahia}, Hamdi and Rachid Essehli and Ruhul Amin and Khalid Boulahya and Toyoki Okumura and Ilias Belharouak",

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T1 - Sodium intercalation in the phosphosulfate cathode NaFe2(PO4)(SO4)2

AU - Ben Yahia, Hamdi

AU - Essehli, Rachid

AU - Amin, Ruhul

AU - Boulahya, Khalid

AU - Okumura, Toyoki

AU - Belharouak, Ilias

PY - 2018/4/1

Y1 - 2018/4/1

N2 - 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.

AB - 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.

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