A leap toward quasi-solid-state chloride-ion batteries with metal-organic frameworks

The development of solid-state electrolytes is a major focus in energy storage, offering improvements in both safety and performance. In chloride-ion batteries (CIBs), where electrode dissolution in liquid electrolytes remains a critical challenge, solid-state alternatives are especially attractive. Herein, we demonstrate for the first time the suitability of a metal-organic framework (MOF) as a solid-state single-ion electrolyte for CIBs. The cationic Al-based MOF MIP-213 ([Al18(μ2-OH)24(OH2)12(mdip)6]6Cl·6H2O) exhibits a chloride ion conductivity of 1.1 × 10–⁶ S cm⁻¹ at 25 °C, is non-flammable, electrochemically stable up to 4.2 V vs Li⁺/Li, and enables single-ion transport in a Li|MIP-213|FeOCl full cell over 100 cycles with Coulombic efficiency >90%, while maintaining structural integrity. These findings position MOFs as promising platforms for designing stable and efficient solid-state batteries.

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