Exploring ionic liquid-laden metal-organic framework composite materials as hybrid electrolytes in metal (ion) batteries

Abstract

This review focuses on the combination of metal-organic frameworks (MOFs) and ionic liquids (ILs) to obtain composite materials to be used as solid electrolytes in metal-ion battery applications. Benefiting from the controllable chemical composition, tunable pore structure and surface functionality, MOFs offer great opportunities for synthesizing high-performance electrolytes. Moreover, the encapsulation of ILs into porous materials can provide environmentally benign solid-state electrolytes for electrochemical devices. Due to the versatility of MOF-based materials, in this review we also explore their use as anodes and cathodes in Li- and Na-ion batteries. Finally, solid IL@MOF electrolytes and their implementation into Li and Na batteries have been analyzed, as well as the design and advanced manufacturing of solid IL@MOF electrolytes embedded on polymeric matrices.

Ionic Liquid-Laden Zn-MOF-74-Based Solid-State Electrolyte for Sodium Batteries

“…Metal-organic frameworks (MOFs) are three-dimensional porous crystalline structures based on the union of different metal ions/aggregates through organic ligands. Benefiting from high surface area, controllable functionality and modularity, MOFs offer great prospects to manipulate the physicochemical properties and electrochemical response of solid-state electrolytes in high-energydensity batteries, in addition to constituting suitable structures to investigate the mechanisms of ionic conduction and structure-property relationships [12][13][14][15][16]. These inherently insulating three-dimensional structures are capable of adsorbing conductive species of lithium/sodium ions or inorganic fillers to engineer solid-state composite electrolytes.…”

Recent progress and perspectives on metal–organic frameworks as solid-state electrolytes for lithium batteries

“…Ionic liquids (ILs) are a kind of molten salts composed of cations and anions with low flammability and high electrochemical and chemical stability. 75 Because This journal is © The Royal Society of Chemistry 2024 of well-defined crystalline frameworks, MOFs can achieve hostguest interactions by the inserting guest ions or molecules. When the IL was completely encapsulated in the MOF pores, ''free flowing'' dry powder of IL@MOFs was obtained.…”

“…The unique properties of IL@MOFs not only renew the prospects of augmenting the safety and wide-temperature durability of the SSEs but also suppress lithium dendrite growth (details can be found in Table 5). 75 Fujie et al 76 proposed an IL (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, EMI-TFSA) incorporated within ZIF-8 to form a host-guest system for the first time in 2014 (Fig. 8a).…”

“…The unique properties of IL@MOFs not only renew the prospects of augmenting the safety and wide-temperature durability of the SSEs but also suppress lithium dendrite growth (details can be found in Table 5). 75…”

MOF-modified dendrite-free gel polymer electrolyte for zinc-ion batteries

“…[44][45][46] The tunable porous structure and high specic surface area of MOFs provide an ideal structure for ionic conductivity, so MOFs can enhance the ionic conductivity performance of electrolytes and promote the migration and transport of ions in electrolytes. [47][48][49] Therefore, they can be used as inorganic llers in combination with polymer matrices to improve the low-temperature conductivity of gel polymer electrolytes. Meanwhile, inorganic particles not only inhibit polymer crystallinity and form ion transport pathways at the interface or within the polymer electrolytes; they also compensate for the degradation of mechanical properties caused by low polymer crystallinity.…”