Sodium metal is of interest for high-energy-density batteries, but the lack of large-area ultrathin sodium metal foils hinders research. Here a metre-length, ultrathin (≤50 μm), mechanically strengthened sodium metal foil is fabricated by a roll-to-roll calendaring process with interfacial lubrication and functional modification.
- Mengyao Tang
- Shuai Dong
- Hua Wang