Enhancing High-Rate Charge-Discharge Performance of Lithium-Sulfur Batteries Using Carbon Black Interlayer

Abstract

In this study, the cathode was coated with Super P, a low-cost conductive carbon, to simplify the process and reduce cost. Electrodes with different sulfur ratios were assembled into cells to characterize their CV curves and impedances. The S0.6-sp cell shows a high discharge capacity of 600 mAh g-1 at 2 C and 967 mAh g-1 at 0.5 C. These values are 10% and 25% higher, respectively, compared to S0.53 cells with the same carbon-to-sulfur ratio. Afterward, the S0.6-sp cell was disassembled to observe the suppression of the shuttle effect by confirming the appearance of the separator. In addition, through SEM images, electrode structure collapse caused by the Li2S/Li2S2 layer was insignificant.