Tuning Anion Composition and Mobility to Balance Ionic Conductivity and Cation Selectivity in Solid Polymer Electrolytes

S/cm) at 100 °C. This enhancement was attributed to a more than 9-fold increase in lithium transference number (0.66 in the ternary blend vs 0.07 in POEM/LiTFSI). Overall, this study highlights the potential for tuning anion composition and mobility to achieve relatively high ionic conductivities and maintain selective cation transport in SPEs, offering a pathway to enable batteries that tolerate elevated temperatures.