Fig. 4: Observation of K2Sx particles in cathode side of K-Na/S batteries. | Nature Communications

Fig. 4: Observation of K2Sx particles in cathode side of K-Na/S batteries.

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

Fig. 4: Observation of K2Sx particles in cathode side of K-Na/S batteries.

a, b Scanning Electron Microscope (SEM) imaging and Energy Dispersive Spectroscopy (EDS) spectrum results of carbon paper from cells after the first cycle with 1 M [S] CPL/acetamide eutectic solvent (ES) (a) and TEGDME (b). c, d X-ray Absorption Near Edge Structure (XANES) mapping of sulfur element for carbon paper from cells after 1 or 10 cycles with ES (c) and TEGDME (d). e, f Operando optical microscope imaging of catholyte at room temperature in (e), ES where no precipitation is observed even at the end of discharge and (f), TEGDME where precipitation starts to appear in the middle of discharge. Precipitates are marked by red dashed circles. [S] in the catholyte and temperature are 1 M and 75 oC, respectively, for (a–d), and 0.5 M and 25 oC, respectively, in (e) and (f).

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