New Electrochemical Systems for Sodium-Ion Batteries

Abstract Two new electrochemical systems have been developed for sodium-ion batteries with a positive electrode based on manganese-doped sodium iron phosphate (NaFe 0.5 Mn 0.5 PO 4 ) and a negative electrode based on a CoGe 2 P 0.1 nanostructure, as well as with a positive electrode based on iron-doped sodium vanadophosphate (Na 3 V 1.9 Fe 0.1 (PO 4 ) 3 ) and a negative electrode based on a CoGe 2 P 0.1 nanostructure. The results of cycling of battery models showed that the energy density of the NaFe 0.5 Mn 0.5 PO 4 /CoGe 2 P 0.1 and Na 3 V 1.9 Fe 0.1 (PO 4 ) 3 /CoGe 2 P 0.1 electrochemical systems is ~165 and 167 W h/kg, respectively.