Fig. 2: Solubility tests and dissolution mechanisms of disulfides and sulfides in the CPL/acetamide mixed solvent. | Nature Communications

Fig. 2: Solubility tests and dissolution mechanisms of disulfides and sulfides in the CPL/acetamide mixed solvent.

From: Designing electrolytes with high solubility of sulfides/disulfides for high-energy-density and low-cost K-Na/S batteries

Fig. 2: Solubility tests and dissolution mechanisms of disulfides and sulfides in the CPL/acetamide mixed solvent.

a The dissolution behavior of K2Sx (x = 1, 2, 4, 8) in CPL/acetamide at 25 oC. The concentrations of sulfur in all samples are 1.2 M. b Tyndall effect tests for 1.2 M K2S in CPL/acetamide eutectic solvent (ES) and 0.1 M K2S in TEGDME, excluding the possibility of forming colloids in ES. c Solubilities of K2S and K2S2 in ES and TEGDME from 60 oC to 120 oC. d Solubilities of K2S, K2S2, and K2S3 in ES and TEGDME in 75 oC. e Calculated radial distribution function of molecular dynamics (MD) simulations of K2S and K2S2 in ES and TEGDME. The larger peak height in ES indicates stronger bonding between K+ and ES. f Fourier Transform Infrared Spectroscopy (FTIR) spectra of pure ES and 0.2 M/0.4 M K2S in ES. A peak representing K+ – solvent interaction shows up at 1550 cm−1 with an increasing concentration of K2S.

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