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Lamellar Ionic Liquid Composite Electrolyte for Wide-Temperature Solid-State Lithium-Metal Battery

机译:Lamellar Ionic Liquid Composite Electrolyte for Wide-Temperature Solid-State Lithium-Metal Battery

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摘要

Electrolytes that can work over a wide temperature range are crucial forsustainableadvanced energy systems. Here, a kind of lamellar ionic liquidcomposite electrolyte (L-ILCE) is explored through confining ionic liquids (ILs)in ordered interlayer nanochannels of 2D vermiculite framework. It is demonstratedthat, within nanochannels, the finely tuned microstructure can inducethe rearrangement and crystallinity of ILs, affording L-ILCE the combinedsuperiorities of liquid electrolyte and solid-state electrolyte. L-ILCE exhibitshigh ionic conductivities (0.09-1.35 × 10~(?3) S cm~(?1) at ?40 to 100 ℃), whereaspolymer and inorganic electrolytes usually lose ionic conduction ability below0 ℃. Additionally, L-ILCE exhibits high transference number (0.89, comparablewith single-ion conductors) and wide electrochemical window (0-5.3 V).LiFePO_4||Li and high-voltage LiNi_(0.8)Mn_(0.1)Co_(0.1)O_2||Li cells assembled fromL-ILCEs exhibit highly stable electrochemical performance in ?20 to 60 ℃.Furthermore, pouch cells (0.1 Ah) exhibit high capacity of 93.8 and 45.0 mAhafter 50 cycles along with capacity retention of 97% and 98% at 60 and?20 ℃, respectively, as well as excellent flexibility and safety. This study offerspromise in the rational design of advanced ion conductors for lithium-basedbatteries with wider operating temperatures.

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