Deciphering and Enhancing Rate-Determining Step of Sodium Deposition towards Ultralow-Temperature Sodium Metal Batteries.

ABSTRACT: Achieving high ionic conductivity and stable performance at low temperatures remains a significant challenge in sodium-metal batteries (SMBs). In this study, we propose a novel electrolyte design strategy that elucidates the solvation structure-function relationship within mixed solvent systems. A mixture of diglyme and 1,3-dioxolane was developed to optimize the solvation structure towards superior low-temperature electrolyte. Molecular dynamics simulations and Raman spectra results reveal the solvent-separated ion pairs and contact ion pairs dominated solvation structure in the designed electrolyte, displaying a superior ionic conductivity of 1.78×10^-3 S cm^-1 at -40 °C. Besides, comprehensive kinetic analysis shows Na⁺ transportation in the electrolyte sh

SUBMITTER: Niu Y 

PROVIDER: S-EPMC11833288 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature