ZIF-67/Super P modified separator as an efficient polysulfide barrier for high-performance lithium‐sulfur batteries

Lithium‐sulfur battery has been regarded to be one of the most promising electrochemical energy storage devices on account of its high theoretical specific capacity, low cost and non-toxicity. Nevertheless, the practical application is largely hindered by the fast capacity attenuation, which primarily resulted from the shuttle effect of the soluble polysulfides. Herein, a ZIF 67-based separator with ion selective permeation is designed to mitigate the shuttling problem. The ZIF-67/Super P composite hinders the migration of polysulfides, while the high conductive Super P leads to efficient utilization of the trapped polysulfides in the subsequent cycles. The battery based on ZIF-67/Super P-coated separator shows a good initial specific capacity of 1341 mAh g‐1 at 0.2 C with great capacity retention and delivers enhanced rate capability. This work verifies the potential of employing MOF-based composites as the modification materials of separators for high performance lithium‑sulfur batteries.