Ionic-liquid Functionalized Metal-organic Framework and Its High Performance Solid Electrolyte for Lithium-ion Conduction

Abstract

Herein, we report a new type solid-state electrolyte based on MOF matrix and Li+ ionic liquid. By covalent bonding the Li+ ionic liquids (MIMS·LiTFSI) on the stable UiO-67 framework, the obtained crystallineILLi-MOF material exhibited high ion conductivities within the wide temperature range (30 oC 1.62 × 10-3 S cm-1, 110 oC 1.26 × 10-2 S cm-1) and efficient Li+ transport (tLi+ = 0.88) [MIMS: 1-(1-mthyl-3-imidazolio) propane-3-sulfonate), LiTFSI: lithium bis(trifluoromethane sulfonyl)imide]. Characterization and control experiment showed the ordered structure of ionic-liquid moiety (MIMS·LiTFSI) arranged along the infinite channel with the ultramicropore (< 1 nm) in the MOF well accounted for the high and efficient target Li+ transfer. Also，such two in one strategy endows such crystalline electrolyte with the merits such as umflammalbe property, stable and unleakage desired.