Alicyclic ammonium ionic liquids as lithium battery electrolytes A review

[EN] Ionic liquids are reasonable alternatives to electrolytes used in energy storage devices, such as lithium batteries, both lithium-ion and lithium-metal, given the safety advantages they provide. This is due to the favourable properties they often possess, mainly non­flammability and non­volatility. Candidates with alicyclic ammonium cations exhibit high electrochemical stabilities, especially towards lithium, a unique feature which enables the fabrication of reversible lithium-metal batteries. Recent advances in this field are reviewed herein, with emphasis on two new families of ionic liquids, based on either azepanium or 3­methylpiperidinium cations, and having potential windows around or above 6 V.