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a E_G2 Beamline Current Adjustion Li2S4 Li2S8/Li2S4 Li2S8 c b 60 E_G2_0.50 M Li S 24 Measurement Interruption - S3 Li2S4 Li2S6 Li2S4 Li2S6 Li2S Li2S d 120 60 2478.8 eV No isosbestic point E_G2 2464 2468 2472 2476 2480 2484 Photon Energy (eV) 0 Potential (V vs. Li/Li+) 180 120 2.940 2.574 2.208 1.841 1.475 1.109 0.7425 0.3763 0.01000 0 40 80 120 180 Discharge capacity (mAh g-1 ) 2.4 2.2 2.0 1.8 2468 2470 2472 2474 2476 2478 2480 2482 Photon Energy (eV) 0 2.2 2.1 2464 2468 E_G2_0.5 M Li2S4 2472 2476 Photon Energy (eV) Isosbestic point 2480 2484 Li2S3 Li2S3 Li2S 2.0 2468 2470 2472 2474 2476 2478 2480 2482 2484 Potential (V vs. Li/Li+) Photon Energy (eV) Figure 4 ǀ Experimental corroboration of the Li2S4-retaining solution pathway. Normalized operando X-ray absorption spectroscopy (XAS) contours at the sulfur K-edge for (a) Li ǀ E_G2 ǀ ECF_Li2S8 (sulfur loading: 6 mg cm-2; applied current density: 0.08 mA cm-2) and (b) Li ǀ E_G2_ Li2S4 ǀ ECF_Li2S8 (sulfur loading: 4.3 mg cm−2; applied current density: 0.04 mA cm-2) upon initial discharge using electrospun carbon fiber (ECF) as the carbon matrix at an E/Scathode ratio of 3.0 mLE gS_cathode−1 and ambient temperature; the corresponding operandodischargecurvesofXASLi-Scellsareshownontheleft. (c-d)thepiling-upXAS spectra for the operando XAS cells of LiǀE_G2ǀECF_Li2S8 and LiǀE_G2_ Li2S4ǀECF_Li2S8 every 40 mAh gs_cathode-1 until the end of discharging. (a) (b) Figure 5 ǀ Application of the Li2S4-retaining solution pathway in a different carbon Page 18 of 24 matrix-ECF. Voltage profiles vs. capacity (a) and cycling capacity retention and coulombic efficiency (b) of Li ǀ E_G2_0.5 M Li2S4 ǀ ECF_Li2S8 cell with a sulfur loading of 6.2 mg cm−2 at an E/Scathode ratio of 3.0 mLE g −1, 0.20 mA cm−2, and 30 °C in the range 1.80–2.45 V. S_cathode 1.590 1.391 1.192 0.9937 0.7950 0.5962 0.3975 0.1987 0.000 0 40 80 120146 -1 Discharge capacity (mAh gs_cathode) s_cathode 2478.8 eV X-ray absorbance X-ray absorbance Discharge capacity (mAh g-1 ) s_ cathode Discharge capacity (mAh g-1 ) s_ cathode Intensity (a.u.) Intensity (a.u.)PDF Image | A lithium-sulfur battery with a solution-mediated pathway
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