Abstract: An electrolytic composition including at least one lithium salt of formula (A) wherein Rf represents a fluorine atom, a nitrile group, an optionally fluorinated or perfluorinated alkyl group having from 1 to 5 carbons, an optionally fluorinated or perfluorinated alkoxy group having from 1 to 5 carbons or an optionally fluorinated or perfluorinated oxa-alkoxy group having from 1 to 5 carbons; and the following solvent mixture: ethylene carbonate, ?-butyrolactone, and methyl propanoate. Also, to the use of the compositions in Li-ion batteries.

Abstract: An electrolytic composition including at least one lithium salt of formula (A) wherein Rf represents a fluorine atom, a nitrile group, an optionally fluorinated or perfluorinated alkyl group having from 1 to 5 carbons, an optionally fluorinated or perfluorinated alkoxy group having from 1 to 5 carbons or an optionally fluorinated or perfluorinated oxa-alkoxy group having from 1 to 5 carbons; and the following solvent mixture: ethylene carbonate, ?-butyrolactone, and methyl propanoate. Also, to the use of the compositions in Li-ion batteries.

Abstract: The present invention relates to ionic liquids comprising, as cation, a specific phosphonium cation, as anion, a formate anion, which can be used, alone or as a mixture, to constitute electrolytes for energy storage devices.

Abstract: A method is provided for developing a hybrid supercapacitor. The method includes the use of a lithium salt of the electrolyte to carry out the intercalation/insertion of the lithium at the negative electrode but by greatly increasing the concentration of lithium ions of the electrolyte order to subsequently accept a depletion. As the depletion in ions has an impact on the conductivity, the amount and the concentration of the electrolyte are chosen in order to make it possible to accept this depletion white retaining a conductivity of the electrolyte compatible with a powerful system for storage of energy. A portion of the Li+ ions present in the electrolyte is used to form the passivation layer and the compound for intercalation/insertion Li˜0.5C6 at the negative electrode.

Abstract: The invention relates to electrolytic compositions comprising: at least one coordination complex comprising lithium and one or several ligands thereof, this (these) ligand(s) corresponding to a phenate compound comprising at least one trifluoromethyl group; and at least one carbonate solvent.

Abstract: The invention relates to a method for developing a hybrid supercapacitor, said method including: at least a step of assembling together a negative electrode, made of at least one non-porous carbon material, and a positive electrode, made of at least one porous carbon material, said electrodes being separated from each other by means of at least one separator impregnated with a liquid electrolyte containing at least one lithium salt dissolved in at least one solvent; and then at least one first charging step, wherein said method is characterized in that: a) the lithium-ion concentration in the liquid electrolyte, before the first charging step, is greater than or equal to 1.

Abstract: This invention relates to an electrolytic composition comprising at least one organic solvent in which one or several non-lithiated ionic salts are dissolved, characterised in that an ionic liquid is added to this electrolytic composition. Application to energy storage devices.

Abstract: The present invention relates to ionic liquids comprising, as cation, a specific phosphonium cation, as anion, a formiate anion, which can be used, alone or as a mixture, to constitute electrolytes for energy storage devices.

Abstract: The invention relates to a lithium hexafluorophosphate solvate usable for the preparation of high purity lithium hexafluorophosphate.This solvate of lithium hexafluorophosphate and pyridine complies with the formula:Li(C.sub.5 H.sub.5 N)PF.sub.6and is prepared by a process comprising the following stages:a) preparation of pyridinium hexafluorophosphate of formula C.sub.5 H.sub.5 NHPF.sub.6 by the neutralization of hexafluorophosphoric acid HPF.sub.6 with pyridine andb) conversion of the pyridinium hexafluorophosphate into solvate LiPF.sub.6, C.sub.5 H.sub.5 N by exchange with a lithium compound chosen from among lithium hydroxide, lithium alkoxides and alkyl-lithiums.The LiPF.sub.6 can be regenerated from the solvate by vacuum decomposition.