Sustainable Aqueous Synthesis and Electrochemical Insights on High-Voltage Sodium Alluaudite Insertion Materials. (25th October 2017)

• Record Type: Journal Article
• Authors: Dwibedi, Debasmita; Baskar, Senthilkumar; Barpanda, Prabeer
• Is Part Of: ECS transactions. Volume 80:Number 10(2017)
• Page Start: 337
• Page End: 342
• Publication Date: 2017-10-25
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/08010.0337ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : The scope of this work is to demonstrate various energy-savvy synthesis routes for alluaudite frameworked high-voltage sodium insertion hosts with generic formula Na(2)Na(1)M(1)M(2)2 (XO4 )3 (M = 3d metals; X= S/ P/ V/ W/ Mo). Here, we have explored two unconventional aqueous routes, namely Pechini and spray drying methods, for SO4 -based alluaudites and solution combustion route PO4 -based alluaudites. Using these sustainable routes, we could achieve the lowest ever synthesis temperature (ca. 200 °C) and the lowest synthesis duration (ca. 6 h) for sulfate class of alluaudites. Further, we have discovered a hitherto unknown electrochemically active NaCoFe2 (PO4 )3 phosphate alluaudite. The electrochemical analyses revealed a reversible (de)sodiation activity providing 80% of net theoretical capacity. Both sulphate and phosphate alluaudites delivered good rate capability and operational stability over 100 cycles maintaining a Coulombic efficiency of 98%.