Recent advances in functional modification of separators in lithium–sulfur batteries

Practical applications of lithium-sulfur (Li-S) batteries are greatly limited by rapid capacity attenuation caused by polysulfide shuttling. Functional modification of separators has been proved to be an efficient strategy to restrain the polysulfide shuttling. Herein, we present a short overview of the recent advances in the development of multi-functional separators, and provide an outlook on the promising approaches for the construction of reliable Li-S batteries.