Senthilkumar, B and Murugesan, C and Sada, K and Barpanda, P (2020) Electrochemical insertion of potassium ions in Na4Fe3(PO4)2P2O7 mixed phosphate. In: Journal of Power Sources, 480 .
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Abstract
Potassium-ion batteries (KIBs) can offer high-voltage performance and energy density similar to lithium-ion batteries with the added advantages of elemental abundance, materials economy, and efficient K+ intercalation due to smaller radius of solvated ions. This nascent field offers ample room to exploit open framework polyanionic compounds as efficient cathode materials. Due to similar ionic size, Na-based compounds can be employed as suitable cathodes for KIBs. In this work, iron-based mixed phosphate Na4Fe3(PO4)2P2O7 is demonstrated as a robust 3.0 V cathode for potassium-ion batteries. The in-situ carbon coated nanoscale Na4Fe3(PO4)2P2O7 cathode delivers a discharge capacity of ~120 mAh g�1 (i.e., 94 of its theoretical capacity) with excellent capacity retention and rate kinetics. With its three-dimensional open framework having multiple alkali sites, Na4-xFe3(PO4)2P2O7 undergoes a solid-solution Fe3+/Fe2+ redox mechanism acting as an efficient host for K+ (de)insertion. It forms the best Fe-based phospho-polyanionic cathode for potassium-ion batteries. A full cell comprising Na4-xFe3(PO4)2P2O7 cathode and graphite anode demonstrates the potential future application in KIBs. It marks the first demonstration of Na-based mixed polyanionic phosphates as insertion hosts for KIBs, which can be extended to various polyanionic insertion materials. © 2020 Elsevier B.V.
Item Type: | Journal Article |
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Publication: | Journal of Power Sources |
Publisher: | Elsevier B.V. |
Additional Information: | The copyright of this article belongs to Elsevier B.V. |
Keywords: | Cathodes; Ions; Lithium-ion batteries; Potassium; Sodium compounds, Capacity retention; Discharge capacities; Electrochemical insertion; Elemental abundance; Future applications; Insertion materials; Redox mechanism; Theoretical capacity, Iron compounds |
Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
Date Deposited: | 22 Sep 2020 07:14 |
Last Modified: | 22 Sep 2020 07:14 |
URI: | http://eprints.iisc.ac.in/id/eprint/66510 |
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