Protective layer for improving the cycle of Li-S based on high DN salt electrolyte

Abstract

Based on the high theoretical capacity of 1,675 mAh g-1 and the cheap price of anode active material, lithium-sulfur batteries are now drawing attention as a next-generation battery to replace lithium-ion batteries. The battery, which uses sulfur as an cathode active material, has switching reactions between various chemical species during the discharge and charging process. The final discharge product, lithium sulfide, is accumulated by growing the space in which electrochemical reactions can take place within the electrodes, causing electrical short circuits. To solve this problem, we achieved 92$ of the theoretical capacity by replacing the LiTFSI salts with the high Gutmann Donor electrolyte salt (LiBr) that can increase the degree of resolution and mobility in the electrodes of lithium sulfide. However, it shows very low metal stability compared to the existing LiTFSI. Therefore, in this study, the problem of anode is identified when salt with high Gutmann Donor electrolyte salt (LiBr). In addition, ceramic polymer composite protective layer was introduced to compensate for this.