High-voltage solid-state sodium batteries often fail at the cathode–electrolyte interface due to side reactions. An isotropic metal–organic framework epilayer that conformally coats the cathode particles helps prevent side reactions, enabling stable cycling at an unusually high cutoff voltage of 4.2 V (vs Na/Na+), exceeding the typical ~3.9 V (vs Na/Na+) limit for polyethylene oxide-based sodium cells.
- Shengjun Xu
- Francesco Ciucci
