Recent progress on metal–organic framework-based separators for lithium–sulfur batteries

Abstract

It is of the utmost importance to develop advanced lithium–sulfur battery (LSB) separators with a view to extending the operational lifespan and increasing energy density. At present, commercially available separators are deficient in effective polysulfide trapping agents and intermediate catalysts. Metal–organic frameworks (MOFs), featuring ordered pore structures, diverse metal centers, and tailorable organic ligands, have been recognized as a class of highly promising materials as functional separators for LSBs. Through rational structural regulation, MOF separators are expected to suppress the shuttle effect of polysulfides and accelerate sulfur redox kinetics. In this review, we present a summary of the latest research studies on MOF-based separators for LSBs, with a particular focus on the relationship between the distinctive structural characteristics of MOFs and their functional roles in polysulfide capture, catalytic conversion, and uniform Li⁺ ion flux regulation. This review provides a systemic and in-depth insight into MOF-based separators for LSBs, hoping that this timely and comprehensive review can shed light on the upcoming research horizons of these booming areas.