Transport properties of a new Li+ ion-conducting ormolyte: (SiO2–PEG)–LiCF3SO3
The transport properties of a new fast Li+ ion-conducting sol–gel-derived ormolyte, (SiO2–10 wt% PEG)–[Li/O] LiCF3SO3, with [Li/O] = 0–0.1 (mol/mol), is reported. The composition with [Li/O] = 0.04 exhibited the highest conductivity (σ25 °C = 1 × 10−4 S cm−1), with an enhancement of 103 over the host matrix (SiO2–10 wt% PEG xerogel), and has been found to be the ‘optimum conducting composition’. Direct determination of Li+ ion mobility (μ) and mobile ion concentration (n) revealed that the enhancement was due to the increase in both μ and n. Studies of the variation of σ, μ, and nversus temperature indicated that the system shows Arrhenius-type behavior. The activation energy and energies of migration and formation were evaluated from their respective Arrhenius plots. Measurement of the ion transference number (tion) confirmed that the ions are the sole charge carriers in the system. These results are discussed in the light of existing theories.