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Sodium-sulfur (Na-S) batteries are promising energy storage systems for renewable energy sources which redeem an intermittent energy source. This study reports the effects of the Na[SO3CF3] fraction in an inorganic Na[SO3CF3]-Cs[N(SO2CF3)2] ionic liquid electrolyte (x(Na[SO3CF3]) = 0.2, 0.3, and 0.4) on the performance of Na-S batteries. Measurements of physicochemical and electrochemical properties demonstrated that decrease in the Na[SO3CF3] fraction decreases viscosity and increases ionic conductivity and the solubility of polysulfides into the ionic liquid, which contributes to the enhanced capacity in the low potential region during discharging.

Automated summary

This study investigates the effects of the Na[SO3CF3] fraction in an inorganic Na[SO3CF3]-Cs[N(SO2CF3)2] ionic liquid electrolyte on the performance of Na-S batteries. The results suggest that reducing the Na[SO3CF3] fraction improves the viscosity, ionic conductivity, and solubility of polysulfides, leading to enhanced capacity in the low potential region during discharging.