Lithium-Ion Conductivity of Polymers Based on Sulfonated Polystyrene and Polymethylpentene Intercalated by Organic Solvents

Abstract

Ion-exchange membranes based on polymethylpentene and sulfonated polystyrene with different grafting degrees were obtained. Solvation and mobility of lithium ions depending on the composition of initial organic solvents were studied. The highest ionic conductivity at room temperature (30°C) are obtained for the membranes containing dimethylsulfoxide (σ = 1.31 × 10^–4 S/cm for membrane with GD = 78%). Membranes containing dimethylformamide are characterized by a constant phase composition in a broad temperature range and the highest ionic conductivity at low temperature (σ = 9 × 10^–6 S/cm at–20°C for a polymer with GD = 78%).