A one-step deposition method to prepare separators with carbon soot loading for lithium-sulfur battery

Carbon materials are widely used in the modification of lithium-sulfur (Li-S) battery separators. They are generally loaded on the separators by coating and filtration methods, which spend much time and additives. Herein, a one-step deposition method was designed to prepare separators with carbon soot (CS) loading simply and rapidly. The CS-loaded separators could provide a conductive network and enhance electrolyte wettability, and also make the electrochemical redox reactions faster. As a result, the battery could reach an improved specific capacity of 901.3 and 754.1 mAh/g at 0.2C and 1C with low carbon loading and remain 522.1 and 536.8 mAh/g after 100 cycles, respectively, with a capacity retention of 57.9% and 71.2%. This strategy provides a simple and efficient strategy to prepare separators for Li-S batteries and has potential application value in industrial production.