ChemInform Abstract: Kroehnkite‐Type Na2Fe(SO4)2·2H2O as a Novel 3.25 V Insertion Compound for Na‐Ion Batteries.

Abstract The title compound is prepared by drying an aqueous solution of Na 2 SO 4 , FeSO 4 , and an optional addition of ascorbic acid at 70—80 °C, followed by further drying of the obtained white powder at 70 °C for 1 h.