Fluoride scavengeable Sb 2 O 3 -functionalized poly(imide) separators for prolonged cycling of lithium-ion batteries.

Nanosize-controlled antimony oxides (Sb 2 O 3 ) that can effectively scavenge fluoride species in a cell are incorporated into a PI separator to regulate its porous structure. The incorporation of the Sb 2 O 3 layer onto the PI separator surface prevents the internal short circuit and efficiently removes fluoride species via chemical scavenging reactions, thereby resulting in stable cycling behaviors upon cycling.