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Effects of Ion Fraction in an Inorganic Ionic Liquid Electrolyte on Performance of Intermediate-Temperature Operating Sodium-Sulfur Batteries (Supporting Information)

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posted on 2023-03-30, 07:11 authored by Di WANG, Jinkwang HWANG, Keigo KUBOTA, Kazuhiko MATSUMOTO, Rika Hagiwara

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.

Funding

Liquid sodium metal secondary battery using solid-liquid two-phase electrolyte

Japan Society for the Promotion of Science

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Corresponding author email address

k-matsumoto@energy.kyoto-u.ac.jp

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© 2023 The Author(s).

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