As illustrated in Figures and, the polysulfide spectra can be characterized by two prominent peaks. First, a robust absorption feature at 2471.5 eV (hereby denoted as "preedge peak") and a more pronounced absorption feature at 2473.3 eV (hereby denoted as "main peak"), reminiscent of the well-known "white line" peak observed in elemental sulfur. Figures S22A and S22B consistently unveil a discernible pre-edge pattern, where an elevated pre-edge peak at 2471.5 eV corresponds to a shorter chain order of polysulfides. This pattern persists regardless of the presence of BNC, spanning Li2S8 to Li2S4 solutions. Conversely, Figure reveals a significant alteration in the pre-edge range due to an excessive concentration of BNC, signifying a substantial change in the SRR caused by an overreaction between BNC and polysulfides.