PDMS-L has an extremely low ionic conductivity that is below the limit of detection because of the low ion impurity content (σ < 4.8 × 10 -10 S/m). In contrast, the ionic conductivity of LiOTf increases by 5 orders of magnitude, yielding the value of (4.28 ± 0.22) × 10 -5 S/m. Although Mix also shows improved ionic conductivity (σ = (2.51 ± 0.12) × 10 -6 S/m) compared to the pure PDMS, it is only about 6% of the value of LiOTf. Since the same amount of LiOTf salt is added into the PDMS with and without ligand functionalization, the extent of salt ionization determines the ionic conductivity of the material. The significantly increased ionic conductivity of LiOTf compared to Mix demonstrates that the formation of metal-ligand coordination facilitates cation-anion dissociation and therefore improves the ionic conductivity of the PDMS (Figure ).