Stepped Channels Integrated Lithium–Sulfur Separator via Photoinduced Multidimensional Fabrication of Metal–Organic Frameworks

Abstract

Multidimensional fabrication of metal-organic frameworks (MOFs) into multilevel channel integrated devices are in high demanded for Li-S separators.S uchs eparators have advantages in pore-engineering that might fulfill requirements such as intercepting the diffusing polysulfides and improving the Li + /electrolyte transfer in Li-S batteries.H owever,most reported works focus on the roles of MOFs as ionic sieves for polysulfides while offering limited investigation on the tuning of Li + transfer across the separators.Ap hotoinduced heat-assisted processing strategy is proposed to fabricate MOFs into multidimensional devices (e.g., hollow/ Janus fibers,d ouble-or triple-layer membranes). Fort he first time,at riple-layer separator with stepped-channels has been designed and demonstrated as ap owerful separator with outstanding specific capacity (1365.0 mAh g À1 )a nd cycling performance (0.03 %fading per cycle from 100 th to 700 th cycle), which is superior to single/double-layer and commercial separators.T he findings may expedite the development of MOF-based membranes and extend the scope of MOFs in energy-storage technologies.

Hydroxylated Multi‐Walled Carbon Nanotubes Covalently Modified with Tris(hydroxypropyl) Phosphine as a Functional Interlayer for Advanced Lithium–Sulfur Batteries

“…The lithium surface corresponding to the intercalation constructed by physical mixing of THPP and CNT‐OH shows slight corrosion (Figure 5e). Interestingly, the interlayer prepared by grafting the organic small molecule THPP onto CNT‐OH has a dense and smooth surface morphology corresponding to Li (Figure 5f), which indicates that there is almost no corrosion due to the formation of the stable SEI layer [27b] . The above results strongly verify that reasonable intercalation design effectively inhibita the shuttle effect of polysulfide and induces the formation of a stable SEI layer, thus reducing the formation of lithium dendrites.…”

Rational Design of MOF-Based Materials for Next-Generation Rechargeable Batteries

“…Consequently, the B/2D MOF-Co can simultaneously regulate the Li stripping and plating behavior and migration of polysulfides, thus achieving the safety and life of Li-S batteries. Recently, Gao et al [48] fabricated a MOF-based triple-layer kind of separator with stepped channels through the combination of multidimensional various MOFs and functional polymers. This MOF/polymer triple-layer separator with stepped channels can inhibit polysulfides shuttling, promote the efficient transfer of Li + /electrolyte, and suppress Li-S battery polarization.…”

Progress and Prospect of Organic Electrocatalysts in Lithium−Sulfur Batteries

“…The sulfur host, as the modifier additive, was introduced to be a robust framework for constructing electron/Li + conduction channels in Li-S batteries so as to alleviate large volume expansions (Zhao et al, 2019), deposit insoluble Li 2 S 2 /Li 2 S sediments (Zhang S. et al, 2021), and limit the migration and permeation of LiPSs into the electrolyte (Yan et al, 2019). Considering the existence of sulfur species, the host plays pivotal roles in regulating the adsorption and transformation of LiPSs.…”

“…Here, the polymers, such as polydimethylsiloxane (PDMS), polyethylene glycol (polyethylene glycol), or cellulose with polar functional groups (Si-O, C-O-C, or -OH) (Suriyakumar et al, 2018), were proved to inhibit the shuttle effect of LiPSs. Gao et al designed a three-layer separator (Gao et al, 2021) with stepped channels by the preparation of MOFs (Zr-, Cu-, Zn-, and Ce-based MOFs) into various organic polymers. In comparison, they confirmed the smallest contact/electrochemical impedance of the three-layer structured separators, which shows faster electronic transfers at the electrode/electrolyte interface.…”