TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvent: (A) is a fluoroalkyl phosphite. The solvent comprises at least one carbonate (ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate, ethylmethyl carbonate, dimethyl carbonate, butylene carbonate, vinylene carbonate, methylpropyl carbonate, methylbutyl carbonate or ethylbutyl carbonate). The solvent comprises at least one linear carbonate and cyclic carbonate (both (10-90 wt.% )).Preferred Lithium Salt: The lithium salt is lithium hexafluorophosphate (preferred), lithium imide, lithium trifluorosulfonate, lithium hexafluoroarsenate, lithium chlorate, lithium aluminium chloride and lithium tetrafluoroborate. The lithium salt concentration is 0.1-3 (preferably 0.50-2) mol/l. (A) is 1-50 (preferably 15-30) %.Preferred Electrolyte: (I) further comprises an additive (gelling agents, polymers and/or ionically conductive polymers).Preferred Electrodes: The negative electrode comprises a lithium metal or its alloy and carbonaceous materials (graphite, amorphous carbon, activated carbon, carbon fibers, carbon black and mesocarbon) capable of being intercalcated and de-intercalcated with lithium ions. The positive electrode comprises transition metal oxides, transition metal sulfides, conducting polymers, compounds capable of being reversibly polymerized and depolymerized by electrolysis and complexed oxides of lithium and transition metals. The positive electrode comprises manganese dioxide, vanadium pentoxide, molybdenum disulphide, titanium disulphide, polyaniline, polypyrrole, disulfide compounds, lithium cobalt compound (LiCoCO2), lithium (IV) manganate, lithium manganese dioxide or lithium nickel oxide (LiNiO2). The storage device is a cell having a shape of a cylinder, a rectangular prism, a coin or a card. Preferred Definitions:    R1-R3 = difluoromethyl, monofluoromethyl, trifluoromethyl, 2,2-difluoroethyl, 2-fluoroethyl, 2,2,2-trifluoroethyl, 3,3,2,2-tetrafluoroethyl, 3,3,3,2,2-pentafluoroethyl, 2,3,3-trifluoropropyl, 3,3,3,2,2-pentafluoropropyl, 1,1,3,3-tetrafluoro-2-propyl, 1,1,1,3,3,3-hexafluoro-2-propyl, 2,2,3,3,4,4,4-heptafluorobutyl or perfluoro-t-butyl.    SPECIFIC COMPOUNDS - The phosphite is tris(2,2,2-trifluoroethyl phosphite), bis (2,2,2-trifluoroethyl)methyl phosphite, 2,2,2-trifluoroethyldimethyl phosphite, tris(monofluoromethyl)phosphite, tris(2,2-difluoroethyl) phosphite or tris(3,2,2-trifluoropropyl) phosphite.