Phase transformation in Na-Fe-S-O quaternary sulfate cathode materials

In last one decade, there have been a resurgence in interest followed by a rigorous research in sodium-ion intercalation chemistry for rechargeable battery application. Though lithium-ion chemistry has been a commercial success and is a lynchpin of the portable electronics era, sodium-ion chemistry...

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Bibliographic Details
Main Authors: Dwibedi, Debasmita, Singh, Shashwat, Pranav, Sai, Barpanda, Prabeer
Format: Conference Proceeding
Language:English
Subjects:
Batteries
Cathodes
Electrode materials
Flux density
Intercalation
Iron sulfates
Lithium
Lithium ions
Organic chemistry
Phase transitions
Rechargeable batteries
Sodium sulfate
Synthesis
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Summary:In last one decade, there have been a resurgence in interest followed by a rigorous research in sodium-ion intercalation chemistry for rechargeable battery application. Though lithium-ion chemistry has been a commercial success and is a lynchpin of the portable electronics era, sodium-ion chemistry can economically address the large-scale stationary rechargeable battery market and offers the exciting avenues of novel intercalation structures, some of which may not exist in their lithium equivalents. To realize the commercially viable large-scale Na-based batteries, the concept of earth abundance should consistently be applied throughout their design. Of significance, compounds constituting Na-Fe-S-O type elements show promising results. In this line, alluaudite structured Na2Fe2(SO4)3 has been reported benchmarking the highest Fe3+/Fe2+ redox potential at 3.8 V (vs. Na) with excellent rate capability and competent energy density. In pursuit of energy-savvy synthesis of this sulfate cathode, this work reports two aqueous based synthesis namely Pechini and spray dry routes. Further, various other Na-Fe-S-O quaternary cathodes along the Na2SO4 and FeSO4 binary phase line and their possible phase transformation have been studied in detail.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5113405