Enabling high-performance all-solid-state hybrid-ion batteries with a PEO-based electrolyte.

All-solid-state hybrid-ion batteries exhibiting a synergistic Na/Li de/intercalation mechanism were designed and assembled, by using modified PEO-based solid polymer electrolyte, NaV(PO)OF cathode, and Li metal anode. The batteries exhibited a high average working voltage of 3.88 V, and an energy density of 432.37 W h kg, providing a new avenue for the development of high-safety and low-cost secondary batteries.