Tailoring hydrogen-bonded networks in polyethylene oxide-based solid-state electrolyte for high solid-state battery performance

In this study, ZnO quantum dots (QDs) and urea are concurrently incorporated into a polyethylene oxide (PEO)-based solid-state electrolyte via a solution casting method. The ZnO QDs effectively diminish the crystalline regions of PEO, while urea establishes an extensive hydrogen-bonded network within the electrolyte. The hydrogen-bonded network not only mitigates the strong coordination between PEO and Li + , but also enhances the mechanical properties of the electrolyte. Based on this, the solid-state electrolyte and its corresponding batteries exhibit remarkable electrochemical performance. At 60 °C, the solid-state electrolyte exhibits an ionic conductivity of 2.54 mS cm −1 . The Li//Li battery demonstrates stable cycling performance over 1900 h, whereas the LiFePO 4 //Li battery maintains cycle stability for 2000 cycles. Furthermore, the LiFePO 4 //Li battery can operate stably at 45 °C, exhibiting excellent electrochemical performance.