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. Author manuscript; available in PMC: 2021 Jun 30.
Published in final edited form as: ACS Energy Lett. 2020 Dec 22;6(1):224–231. doi: 10.1021/acsenergylett.0c02461

Figure 4.

Figure 4.

(a) The relationship between the degree of solubility towards lithium polysulfides (Li2S6) and the achievable E/S ratio in a Li-S cell operating completely under solution-mediated pathways. (b) Optical image showing the inability to solvate 1 M Li2S6 in DOL/DME, but the heightened solubility offered through the addition of 0.2 M CH3TFA. (c) The discharge behavior of two Li-S pouch cells operating under a lean E/S ratio of 4.5 μL mg−1, with both formulations also containing 0.2 M LiNO3. An aberrant charge step occurred on Cycle 20 in the CH3TFA-containing cell, after which the upper voltage cutoff was decreased for the remainder of cycling. (d) Discharge and charge behaviors of each pouch cell on Cycle 30.