Sodium-ion batteries are often seen as the sustainable successor to lithium—but a new twist is emerging. This episode dives into solvent co-intercalation, a phenomenon where solvent molecules infiltrate the cathode alongside sodium ions. Far from being a flaw, this could be a new lever for tuning redox properties, phase behavior, and cycle life in SIBs.

Feature paper:

https://doi.org/10.1038/s41563-025-02287-7Article