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, Na 2 V 2 (PO 4 ) 2 O 2 F 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 -1 , providing a new avenue for the development of high-safety and low-cost secondary batteries.