Fabrication of a PEO-PVDF blend based polymer composite electrolyte with extremely high ionic conductivity via the addition of LLTO nanowires

In this study, fast ionic conductor electrospun Li0.33La0.55TiO3 (LLTO) nanowires were added to the PEO-PVDF blend electrolyte. We then investigated the effect of nanowire diameter and weight percentage on ionic conductivity, mechanical properties, and electrolyte performance. The results indicated that polymer composite electrolytes containing 88 nm diameter nanowires exhibited a higher ionic conductivity than those containing 161 nm or 238 nm diameter nanowires. By adding LLTO nanowires with a diameter of 238 nm, the electrochemical potential window increased to at least 4.87 V. The stability of composite polymer electrolytes containing nanowires with a diameter of 88 nm was greater than that of composite polymer electrolytes containing nanowires with a diameter of 238 nm. By adding 8 wt% LLTO nanowires with a diameter of 88 nm to the PEO-PVDF blend electrolyte, the thermal stability and ionic conductivity increased to 450 °C and 6.02 mS.cm−1, respectively.