A modified polybenzimidazole (mPBI) was synthesized to tame the polysulfides (PS) shuttling in Li–S batteries via dual actions. As a binder, the mPBI mechanically and chemically offers strong electrode integrity and high sulfur loading, inhibits sulfur loss and prolongs lifespan for sulfur electrode. As a functional agent, the mPBI builds a shield onto the separator to block PS migration so as to further suppress the PS shuttling. This strategy confers an excellent performance of 750 mAh g−1 (or 5.2 mAh cm−2) after 500 cycles at C/5 for the resultant Li–S battery with an ultralow capacity fading rate of 0.08% per cycle.
- Gaoran Li
- Can Wang
- Shanqing Zhang
