A Minimal Hybrid-chain Ether Electrolyte Enables Wide-Temperature Sodium-Ion Batteries

Key Points

• This research aims to explore a hybrid-chain ether electrolyte that enhances the performance of sodium-ion batteries (SIBs) across various temperatures.
• Developed a hybrid electrolyte combining short-chain dimethoxyethane and long-chain triglyme.
• Evaluated electrolyte performance at varying temperatures to assess Na+ solvation and interfacial chemistry effects.
• Analyzed freezing point depression to determine electrolyte efficiency.
• The hybrid-chain electrolyte lowered the freezing point below -20°C, improving battery operation in cold conditions.
• Enhanced Na+ solvation and interfacial stability contributed to better battery performance.
• Significant performance improvements noted under thermally challenging conditions.