Li7La3Zr2O12 Ceramic Nanofiber-Incorporated Solid Polymer Electrolytes for Flexible Lithium Batteries

A solid polymer electrolyte (SPE) with one-dimensional Li-ion channels has been constructed by incorporating Li7La3Zr2O12 (LLZO) nanofibers within a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/ionic liquid (IL) matrix. Owing to the successive Li-ion transport pathways constructed by means of one-dimensional LLZO nanofibers, the fabricated SPE containing 15 wt % LLZO nanofibers exhibited an improved ionic conductivity (6.5 × 10–3 S cm–1) at room temperature (RT) and a wide electrochemical window (5.3 V vs Li/Li+). The SPE possesses excellent flexibility ensuring enhanced mechanical strength and distinctly resists Li dendrite crossover. Finally, both SPE-based half and full cells afforded impressive electrochemical properties. All of the favorable results demonstrated that the developed SPE is a promising safer and high-performance electrolyte for application in flexible solid-state Li batteries.