Porous Organic Polymer-Coated Permselective Separator Mitigating Self- Discharge for Lithium-Sulfur Batteries
Lithium-sulfur battery (Li–S) is considered as a futuristic energy storage system owing to its high theoretical energy density, environmental benignity, and relatively low cost. However, the practical applications of Li–S batteries are still hampered by the insulating nature of elemental sulfur and capacity degradation resulting from the lithium polysulfide shuttling (LiPSs). Herein, we demonstrate the use of porous organic polymer-coated Celgard 2320 (POP- CG) separator as permselective membrane that is capable of not only delivering higher discharge capacity but also preventing the self-discharge of Li-S cell beyond 116 h which is superior to earlier reports. This coated membrane not only offered higher discharge capacity but also exhibited superior wettability and thermal stability. The enhanced electrochemical properties of the lithium-sulfur cell are mainly attributed to the coated -POP on the separator which effectively confines polysulfides by chemical interactions.