Abstract:
Four different PBAs, namely Na2Ni[Fe(CN)6], Na2VOx[Fe(CN)6], Na2Cr[Fe(CN)6], and NaXMn[Mn(CN)6] were prepared by electrochemical deposition and characterized. The Na-intercalation mechanisms were studied in-depth using electrochemical impedance spectroscopy. A hypothetical model for the mechanism in aqueous and non-aqueous media was proposed and verified for different intercalation systems. Model battery systems based on PBA electrodes were optimized, and their battery performances were tested.