Improved Interfacial Property of Na3V2(PO4)3@C Cathode: Application of NaODFB-Based Ether Electrolyte in Sodium-Ion Batteries

Abstract Sodium-ion batteries are considered as one of the most promising energy storage technologies that may replace lithium-ion batteries in the future. NaODFB, a new chelated sodium salt with the specific structural, has not been widely concerned by researchers. In this work, the compatibility of different NaODFB-based ether electrolytes in half-cell/full-cell systems with Na3V2(PO4)3 (NVP) cathode materials was compared. The correlation between the electrochemical performance of NVP@C/Na half cells in NaODFB-based ether electrolytes and the composition of the cathode electrolyte interface (CEI) film on the electrode surface was analyzed by electrochemical tests and other characterizations to better understand the important role of NaODFB-based ether electrolytes in the formation of the CEI film on the electrode material surface. This research provides a novel idea for the industrial design of Na-ion battery electrolyte and has significant guidance for the application of NaODFB in Na-ion battery.