Fig. 3: Electrochemical performance of K-Na/S batteries with 1 M sulfur in catholytes. | Nature Communications

Fig. 3: Electrochemical performance of K-Na/S batteries with 1 M sulfur in catholytes.

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

Fig. 3: Electrochemical performance of K-Na/S batteries with 1 M sulfur in catholytes.

a Cycling of K-Na/BASE/K-Na symmetric cells with carbon black (blue) and without carbon black (orange) at different current densities. b Charge/discharge voltage profiles of 1 M [S] cells in CPL/acetamide eutectic solvent (ES) and TEGDME electrolyte, respectively. The initial composition is Na2S8, with K+ ions passing BASE. c Cycling performance of cells with ES and TEGDME electrolytes at 0.5 mA cm−2. Electrochemical impedance spectroscopy of cells at (d) the fully charged state, and (e) discharged to 598 mAh g−1 sulfur, corresponding to M2S2.8. The range of frequency is 1 MHz – 1 mHz. All tests are done at 75 oC in an oven.

Back to article page