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Layered P2-NaxCoO2 and NaxFeO2 as cathode materials for potassium-ion batteries

Baskar, Senthilkumar and Sada, Krishnakanth and Barpanda, Prabeer (2017) Layered P2-NaxCoO2 and NaxFeO2 as cathode materials for potassium-ion batteries. In: 232nd ECS Meeting, 1 October 2017 through 5 October 2017, National Harbor, pp. 357-364.

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Official URL: https://doi.org/10.1149/08010.0357ecst


Electrochemical intercalation of sodium and potassium-ion in NaxCoO2 and NaxFeO2 was successfully studied in this work. The Na0.84CoO2 and NaxFeO2 were synthesized by solution combustion synthesis technique using urea as fuel. The as-prepared Na0.84CoO2 assumed a hexagonal structure with P63/mmc space group built from slabs of edge-sharing CoO6 octahedra accommodating Na in prismatic sites. Hexagonal platelet-like morphology was observed by SEM and TEM micrography. Firstly, the Na-ion intercalation in P2-type Na0.84CoO2 layered material was examined. The P2-type Na0.84CoO2 exhibited a reversible capacity of 148 mA h g-1 in Na-ion cell. Following, the K-ion (de)intercalation behavior of the material was investigated for the first time. The reversible K-ion (de)intercalation was observed with the high capacity of 71 mA h g-1 at C/10 current rate. Na0.84CoO2 cathode act as a suitable host for K+ intercalation delivering robust cycling, rate capability and Coulombic efficiency. In contrast, NaxFeO2 was found to be electrochemically inactive for K-ion insertion.

Item Type: Conference Paper
Publication: ECS Transactions
Publisher: Electrochemical Society Inc.
Additional Information: The Copyright of this article belongs to the Electrochemical Society Inc.
Keywords: Cathodes; Cobalt compounds; Combustion synthesis; Ions; Iron compounds; Potassium; Secondary batteries; Urea; Coulombic efficiency; Electrochemical intercalations; Hexagonal platelets; Hexagonal structures; Intercalation behavior; Rate capabilities; Reversible capacity; Solution combustion synthesis; Phosphorus compounds
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 24 Jun 2022 06:27
Last Modified: 24 Jun 2022 06:27
URI: https://eprints.iisc.ac.in/id/eprint/73489

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