Original paper
Oxidative decomposition products of synthetic NaFePO4 marićite: nano-textural and electrochemical characterization
Brunet, Fabrice; Crouzet, Camille; Cretu, Sorina; David, Rénald; Courty, Matthieu; Demortière, Arnaud; Recham, Nadir
European Journal of Mineralogy Volume 31 Number 4 (2019), p. 837 - 842
35 references
published: Dec 12, 2019
published online: Sep 17, 2019
manuscript accepted: Jul 23, 2019
manuscript revision received: Jun 30, 2019
manuscript received: Apr 21, 2019
Abstract
Single-phase marićite, NaFePO4, was synthesized from a mixture of monosodium phosphate and iron oxalate at 750 °C and atmospheric pressure. Thermal treatment of synthetic marićite in air led to its oxidative decomposition into Na3Fe23+(PO4)3 NASICON and α-Fe2O3, which started at temperatures slightly below 225 °C. Intergrowth of the two reaction products is found to occur at the nanoscale without identified crystallographic relationship with the marićite precursor. Electrochemical activity of the reaction product is confirmed with the reversible insertion of one Na at 2.55 V versus Na+/Na0.
Keywords
sodium iron phosphate • marićite • sodium-ion batteries • oxidative decomposition • NASICON