Off-Stoichiometry in Alluaudite-Type Sodium Iron Sulfate Na2+2xFe2-x(SO4)3 as an Advanced Sodium Battery Cathode Material

Gosuke Oyama; Shin ichi Nishimura; Yuya Suzuki; Masashi Okubo; Atsuo Yamada

doi:10.1002/celc.201500036

Off-Stoichiometry in Alluaudite-Type Sodium Iron Sulfate Na_2+2xFe_2-x(SO₄)₃ as an Advanced Sodium Battery Cathode Material

Gosuke Oyama, Shin ichi Nishimura, Yuya Suzuki, Masashi Okubo, Atsuo Yamada^*

^*Corresponding author for this work

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

103 Citations (Scopus)

Abstract

An alluaudite-type sodium iron sulfate has recently been discovered as a 3.8V cathode material for low-cost, high-power, and efficient sodium-ion batteries. To optimize the composition of the alluaudite phase and to explore further compounds, we have carefully surveyed the Na₂SO₄-FeSO₄ binary system. Solid-state reactions at a moderate temperature of 623K produce two stable phases: 1)vanthoffite-structured Na₆Fe(SO₄)₄ and 2)alluaudite-type Na_2+2xFe_2-x(SO₄)₃ with a certain non-stoichiometry. The possible compositional and structural flexibilities demonstrated in this work inspire further improvement of the alluaudite-type sodium metal sulfates for advanced sodium-ion batteries.

Original language	English
Pages (from-to)	1019-1023
Number of pages	5
Journal	ChemElectroChem
Volume	2
Issue number	7
DOIs	https://doi.org/10.1002/celc.201500036
Publication status	Published - 2015 Jul 15
Externally published	Yes

Keywords

Alluaudite
High-voltage cathode
Nonstoichiometric compounds
Sodium iron sulfate
Sodium-ion batteries

ASJC Scopus subject areas

Catalysis
Electrochemistry

Access to Document

10.1002/celc.201500036

Cite this

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title = "Off-Stoichiometry in Alluaudite-Type Sodium Iron Sulfate Na2+2xFe2-x(SO4)3 as an Advanced Sodium Battery Cathode Material",

abstract = "An alluaudite-type sodium iron sulfate has recently been discovered as a 3.8V cathode material for low-cost, high-power, and efficient sodium-ion batteries. To optimize the composition of the alluaudite phase and to explore further compounds, we have carefully surveyed the Na2SO4-FeSO4 binary system. Solid-state reactions at a moderate temperature of 623K produce two stable phases: 1)vanthoffite-structured Na6Fe(SO4)4 and 2)alluaudite-type Na2+2xFe2-x(SO4)3 with a certain non-stoichiometry. The possible compositional and structural flexibilities demonstrated in this work inspire further improvement of the alluaudite-type sodium metal sulfates for advanced sodium-ion batteries.",

keywords = "Alluaudite, High-voltage cathode, Nonstoichiometric compounds, Sodium iron sulfate, Sodium-ion batteries",

author = "Gosuke Oyama and Nishimura, {Shin ichi} and Yuya Suzuki and Masashi Okubo and Atsuo Yamada",

note = "Publisher Copyright: {\textcopyright} 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.",

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AU - Oyama, Gosuke

AU - Nishimura, Shin ichi

AU - Suzuki, Yuya

AU - Okubo, Masashi

AU - Yamada, Atsuo

PY - 2015/7/15

Y1 - 2015/7/15

N2 - An alluaudite-type sodium iron sulfate has recently been discovered as a 3.8V cathode material for low-cost, high-power, and efficient sodium-ion batteries. To optimize the composition of the alluaudite phase and to explore further compounds, we have carefully surveyed the Na2SO4-FeSO4 binary system. Solid-state reactions at a moderate temperature of 623K produce two stable phases: 1)vanthoffite-structured Na6Fe(SO4)4 and 2)alluaudite-type Na2+2xFe2-x(SO4)3 with a certain non-stoichiometry. The possible compositional and structural flexibilities demonstrated in this work inspire further improvement of the alluaudite-type sodium metal sulfates for advanced sodium-ion batteries.

AB - An alluaudite-type sodium iron sulfate has recently been discovered as a 3.8V cathode material for low-cost, high-power, and efficient sodium-ion batteries. To optimize the composition of the alluaudite phase and to explore further compounds, we have carefully surveyed the Na2SO4-FeSO4 binary system. Solid-state reactions at a moderate temperature of 623K produce two stable phases: 1)vanthoffite-structured Na6Fe(SO4)4 and 2)alluaudite-type Na2+2xFe2-x(SO4)3 with a certain non-stoichiometry. The possible compositional and structural flexibilities demonstrated in this work inspire further improvement of the alluaudite-type sodium metal sulfates for advanced sodium-ion batteries.

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KW - Nonstoichiometric compounds

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