Multifunctional MOF‐Based Separator Materials for Advanced Lithium–Sulfur Batteries

Abstract

Despite the high theoretical specific capacity of 1675 mAh g−1, lithium–sulfur batteries (LSBs) are still far away from wide commercialization due to the poor sulfur/Li2S electroconductivity and the polysulfides shuttle effect. In order to alleviate the active materials shuttling, separators in LSBs are required to guarantee the fast lithium‐ion transfer as well as the strong polysulfides immobilization. Therefore, various functional materials have been employed to modify the separator to achieve this goal. Among them, metal–organic frameworks (MOFs) with easy morphology design and high ionic or electronic conductivity have been widely investigated. This review summarizes the recent advances of MOF‐based interlayer for LSBs separator functionalization. Original MOFs, MOF derivatives, and MOF composites are included in this discussion. The mechanism of the enhancement of the electrochemical performance of each modified separator is explicated. Furthermore, the prospect of this promising area is provided.

Function-directed design of battery separators based on microporous polyolefin membranes

“…Transition metal phosphides, 53 carbon materials, 54 metal-organic frameworks (MOFs) and their derivatives 55,56…”

Thiol-Containing Metal–Organic Framework-Decorated Carbon Cloth as an Integrated Interlayer–Current Collector for Enhanced Li–S Batteries

“…As a representative organic–inorganic hybrid material fabricated from organic ligands and metal nodes, metal–organic frameworks (MOFs) have great potential as the interlayer of Li–S batteries because of their regular topological network, large specific surface area, and tunable pore diameter. ,− More importantly, a rich combination of organic linkers and metal centers leads to MOFs of various functionalities for different applications. − For example, Tian et al reported a highly oriented MOF membrane and demonstrated that it can be used as an interlayer to suppress polysulfide shuttling . Qi et al used a Ti-MOF coating layer as a chemical barrier to capture polysulfides .…”

Holistic Design Consideration of Metal–Organic Framework-Based Composite Membranes for Lithium–Sulfur Batteries

“…Despite the improved cycling performance of Li–S batteries by using MOF-modified separators, − the trapped LiPS species within the MOF pores are difficult to reutilize for subsequent cycling because of the insulating nature of most MOFs, thereby leading to an irreversible loss of the cycling capacity. , To overcome this issue, researchers have mixed MOFs with conductive materials to provide electron pathways, so that the trapped LiPS species in the separator can be more effectively reutilized during the repeating charging/discharging process. − Although many of the previous studies attribute the improved performance to the physical/chemical blocking and trapping effect of MOFs toward LiPS species, ,, the underlying mechanism of how each component and their interplay in the composite influences the battery performance is still unclear.…”