TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The component (A) is lithium carboxylate and/or lithium sulfonate, or lithium formate, lithium acetate, lithium propionate, lithium butyrate, lithium isobutyrate, lithium valerate, lithium isovalerate, lithium caproate, lithium enanthoate, lithium caprylate, lithium pelargonate, lithium caprate, lithium laurate, lithium myristate, lithium pentadecylate, lithium palmitate, lithium oleate, lithium linoleate, lithium oxalate, lithium lactate, lithium tartrate, lithium maleate, lithium fumarate, lithium malonate, lithium succinate, lithium malate, lithium citrate, lithium glutarate, lithium adipate, lithium phthalate, lithium benzoate, lithium poly(2-acrylamide-2-methyl-1-propanesulfonate), lithium poly(styrene-sulfonate), lithium poly(vinyl sulfonate), lithium poly(perfluoro sulfonate), lithium poly((meth)acrylate), lithium polymaleate, lithium polyfumarate, lithium polymuconate, lithium polysorbate, lithium poly(acrylonitrile-butadiene-acrylate)copolymer, lithium poly(t-butylacrylate ethylacrylate methacrylate)copolymer, lithium poly(ethylene-acrylate)copolymer, and/or lithium poly(methylmethacrylate methacrylate)copolymer. The component (C) is boron trifluoride, boron trifluoride dimethyl-ether complex, boron trifluoride diethylether complex, boron trifluoride di-n-butyl-ether complex, boron trifluoride di-t-butyl-ether complex, boron trifluoride t-butyl methyl ether complex, boron trifluoride tetrahydrofuran complex, boron trifluoride methanol complex, boron trifluoride propanol complex, boron trifluoride phenol complex and/or boron trifluoride piperidinium. The component (D) is ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, ( gamma )-butyrolactone and/or sulfolane. The content of component (E) is 0.2-13 %mass with respect to total content of the electrolyte.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The electrolyte further comprises matrix polymer (B).    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The component (B) is polyethylene oxide, polypropylene oxide, polyvinyl fluoride, polyvinylidene fluoride, polyvinylidene-fluoride hexafluoropropylene copolymer, polyvinylidenefluoride hexafluoride acetone copolymer, polytetrafluoroethylene, polyacrylonitrile, polyphosphazene, and/or polysiloxane.