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Areal capacity ( mAh cm-2) a3.20 1 2 3 b0.6 1.99 2.28 2.06 Li E_G2_0.5 M Li2S4 ACFC 2.22 2.45 2.45 Li E_G2_0.5 M Li2S4 ACFC 2.8 2.4 2.0 1.6 0 c 2000 1600 1200 800 400 800 1200 1600 0.4 0.2 0.0 -0.2 -0.4 -0.6 1.8 d 2000 2.0 2.2 2.4 Potential (V vs. Li/Li+) 2.6 2.8 Specific capacity (mAh g-1) s C E a v g =9 9 . 8 % CEavg=96.9 % Li E_G2_0.50 M Li2S4ACFC at 0.075C Li E'_G2_1.50 M Li2S4ACFC at 0.075C CEavg=99.7% CEavg=95.8 % LiE_G2_0.50 M Li2S4ACFC 0.075 C 0.300 C 0 20 40 60 80 100 Cycle number 80 1600 60 40 1200 20 0 800 0 10 20 30 40 50 Cycle number 100 100 80 60 40 20 0 Figure 1 ǀ A new Li2S4-dictated pathway under lean electrolyte conditions. (a) A typical discharge/charge curve of Li ǀ E_G2_0.50 M Li2S4 ǀ ACFC cell after initial cycles at 0.075 C and 30 °C; (b) PCGA trace of LiǀE_G2_0.5 M Li2S4ǀACFC at 30 °C. Retention degree of Li2S4 is tuned in the bulk electrolytes using various discharge rates for E_G2_0.5 M Li2S4 (c) and the same low discharge rate of 0.075C in different concentrations of Li2S4 (d); Fig. 1a is the 9th cycle curve of the Li-S cell in Fig. 1c at 0.075C. Microporous activated carbon fiber cloth (ACFC) was used as a model material to study electrolyte dependence of the sulfur reduction pathway under lean electrolyte conditions. Different concentrations of Li2S4 were prepared in E_G2 (1 M LiTFSI_0.3 M LiNO3 in G2) and Eꞌ_G2 (1 M LiTFSI_0.9 M LiNO3 in G2). Page 15 of 24 Coulombic efficiency (%) Coulombic efficiency (%) Specific capacity (mAh g-1) s + Potential (V) vs. Li/Li Specific capacity (mAh g-1) s Q (mAh)PDF Image | A lithium-sulfur battery with a solution-mediated pathway
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