Organically modified silica-supported ionogels electrolyte for high temperature lithium-ion batteries
Abstract A new solid-state ionogel electrolyte was synthesized using a silane coupling agent (SCA) that can spontaneously form a porous network to confine an ionic liquid electrolyte (ILE). We found that epoxy groups grafted on silica can promote the ionic dissociation of a lithium salt and ionic liquid. The ionogel with the optimal molar ratio (ILE/SCA=0.75) exhibited excellent thermal stability, a wide redox stability window, and ionic conductivity of 1.91×10 −3 Scm −1 at 30°C, which is higher than that of the pure IL electrolyte. The developed ionogel improved the operating temperature of batteries from room temperature to at least 90°C. Furthermore, the good compatibility of the ionogel with a LiFePO 4 cathode and Li 4 Ti 5 O 12 anode indicates that it can be used as an electrolyte for full battery systems. More importantly, the SCA was employed as an organosilica precursor to synthesize a new solid-state ionogel electrolyte. This new ionogel electrolyte with high stability and capacity represents a considerable advance in solid-state electrolytes for lithium-ion batteries. Highlights Epoxy group modified silica-supported ionogel as a novel solid-state electrolyte for lithium batteries. The scaffold offers both a rigid framework of ordered inter-connected mesoporous and direct ion transport pathway features. Epoxy groups grafted can promote the ionic dissociation of a lithium salt and IL. Li/LiFePO 4 and Li/Li 4 Ti 5 O 12 solid-state battery displayed high cycling stability. Graphical abstract [DISPLAY OMISSION]
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