Layered P2-NaxCoO2 and NaxFeO2 as Cathode Materials for Potassium-Ion Batteries. (25th October 2017)

• Record Type: Journal Article
• Authors: Baskar, Senthilkumar; Sada, Krishnakanth; Barpanda, Prabeer
• Is Part Of: ECS transactions. Volume 80:Number 10(2017)
• Page Start: 357
• Page End: 364
• Publication Date: 2017-10-25
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/08010.0357ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Electrochemical intercalation of sodium and potassium-ion in Nax CoO2 and Nax FeO2 was successfully studied in this work. The Na0.84 CoO2 and Nax FeO2 were synthesized by solution combustion synthesis technique using urea as fuel. The as-prepared Na0.84 CoO2 assumed a hexagonal structure with P 6 3/ 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 Na0.84 CoO2 layered material was examined. The P2-type Na0.84 CoO2 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. Na0.84 CoO2 cathode act as a suitable host for K + intercalation delivering robust cycling, rate capability and Coulombic efficiency. In contrast, Nax FeO2 was found to be electrochemically inactive for K-ion insertion.