Another notable observation is the increase of sulfur intensity in cathodes from the 1st cycle to 25th cycle in both electrolytes, with higher intensity in the baseline compared to the 0.01 M BNC-containing electrolyte. This can be attributed to the sluggish kinetics in the baseline, leading to the formation of unreacted insoluble polysulfides (Li2S2/Li2S) and the accumulation of isolated sulfur on the cathode surface. The lower sulfur intensity on the cathodes in the 0.01 M BNC containing electrolyte further supports this, reflecting a mutual outcome of improved kinetics and moderate sulfur depletion.