Abstract: An ionic liquid-based composition for protecting lithium metal anodes in a lithium-based electrochemical energy storage system, comprising a polymerizable ionic liquid (or ionic liquid monomer), the cation or the anion of which carries at least one polymerizable function, a non-polymerizable ionic liquid, an ionic liquid of the “crosslinker” type, the cation or the anion of which carries at least two polymerizable functions, and a lithium salt. This composition is then coated and polymerized onto a metallic lithium surface and serves as protection layer. The ionic liquid-based polymer composition coated as such on the lithium surface, even if it is swelling with liquid electrolyte, protects the lithium against a constant electrolyte consumption and formation of unstable solid-electrolyte interphase (SEI), which is continuously forming on a bare lithium surface. The growing of dendrites is retarded with such ionic liquid-based polymer composition protection.

Abstract: A method for making an electrode for an ionic liquid-based supercapacitor comprising two electrodes (anode, cathode) separated by an ionic polymer electrolyte separator, comprising: a step for making a carbon paste resulting from mixing carbon materials, ionic liquids and a binder, so as to obtain an active material for the electrode at room temperature, and a step for forming the electrode from mechanically processing the active material. A supercapacitor comprising a stack of a cathode electrode, an electrolyte separator and an anode electrode, the cathode and anode electrodes being electrically connected to current collectors, wherein the electrolyte separator comprises a polymer with an ionic liquid and the electrodes comprise a carbon-based active material mixed with an ionic liquid electrolyte and a binder.

Abstract: A photochromic composition that is liquid at 20° C. and includes (a) at least one photochromic dye and (b) an ionic solvent selected from (b)(i) room-temperature ionic liquids (RTIL), (b)(ii) ionic liquid mixtures that are liquid at room temperature, and (b)(iii) room-temperature liquid mixtures of at least one ionic liquid and at least one organic solvent that is miscible therewith. The use of said photochromic composition in optical devices such as ophthalmic lenses is also described.

Abstract: A photochromic composition that is liquid at 20° C. and includes (a) at least one photochromic dye and (b) an ionic solvent selected from (b)(i) room-temperature ionic liquids (RTIL), (b)(ii) ionic liquid mixtures that are liquid at room temperature, and (b)(iii) room-temperature liquid mixtures of at least one ionic liquid and at least one organic solvent that is miscible therewith. The use of said photochromic composition in optical devices such as ophthalmic lenses is also described.