The data of the article“Weakly Solvating Cyclic Ether and Anion–Synergistic Regulation of a Stable Interfacial Layer on Sodium Metal Anodes”

This study proposes a "strong–weak solvent synergy" strategy.The dataset supports for the following conclusions that by introducing a weakly solvating cyclic ether solvent, 1,3-dioxolane (DOL), into strongly polar carbonate solvents, combined with the regulatory effect of PF6– anions, a stable sodium metal anode interface was constructed. The results show that the low binding energy of DOL significantly reduces the interfacial transport barrier of Na+, increasing the ionic conductivity of the electrolyte to 9.31 mS·cm–1 and effectively suppressing dendrite growth. In the NaPF6-based electrolyte system, PF6– anions, with their concentrated LUMO energy level (−0.639 eV), preferentially decompose to form an inorganic-rich SEI layer, exhibiting excellent interfacial stability and cycling performance. The modified electrolyte maintains a wide electrochemical window (~4.21 V) inherent to the carbonate system while significantly reducing the polarization voltage in Na∥Na symmetric cells. A full cell with the Na3V2(PO4)3||Na configuration demonstrates a high capacity retention of 92.1% after 1600 cycles at 2C rate (1C=120 mA·g–1).