Designing fluorine-free electrolytes for stable sodium metal anodes and high-power seawater batteries via SEI reconstruction

F-free, cost-effective 1 M NaBH 4 /glyme electrolytes induce SEI reconstruction, which converts the native oxide layer on sodium metal to a NaH-based SEI layer. With 1 M NaBH 4 /DEGDME, we achieved long-term cycling, high-power seawater batteries.