TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Lithium salt is carboxylic acid lithium salt and/or sulfonic acid lithium salt e.g. formic acid lithium salt, lithium acetate, propionic acid lithium salt, butyric acid lithium salt, isobutyric acid lithium salt, valeric acid lithium, isovaleric acid lithium salt, caproic acid lithium salt, enanthoic acid lithium salt, caprylic acid lithium salt, pelargonic acid lithium salt, capric acid lithium salt, lauric acid lithium salt, myristic acid lithium salt, pentadecylic acid lithium salt, lithium palmitate, lithium oleate, linoleic acid lithium salt, lithium oxalate, lactic acid lithium salt, lithium tartrate, maleic acid lithium, fumaric acid lithium salt, malonic acid lithium salt, lithium succinate, malic acid lithium salt, lithium citrate, glutaric acid lithium salt, adipic acid lithium salt, phthalic acid lithium salt, lithium benzoate, poly(2-acrylamide-2-methyl-1-propanesulfonic acid lithium salt), poly(styrene sulfonic acid lithium salt), poly(vinyl sulfonic acid lithium salt), poly(perfluoro sulfonic acid lithium salt), poly((meth) acrylic acid lithium salt), polymaleic acid lithium salt, polyfumaric acid lithium salt, polymuconic acid lithium salt, polysorbic acid lithium salt, poly(acrylonitrile-butadiene-acrylic acid lithium salt) copolymer, poly(tert.-butylacrylate-ethylacrylate-methacrylic acid lithium) copolymer, poly(ethylene-acryl acid lithium salt) copolymer, and/or poly(methylmethacrylate-methacrylic acid lithium salt) copolymer. Boron compound is boron trihalide, boron-trihalide alkyl ether complex, boron-trihalide alcohol complex, and/or boron-trihalide salt e.g. boron trifluoride, boron trifluoride dimethyl-ether complex, boron trifluoride diethylether complex, boron trifluoride di-n-butyl-ether complex, boron trifluoride di-tert.-butyl-ether complex, boron trifluoride tert.-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. Organic solvent is carbonate ester compound, lactone compound, and/or sulfone compound e.g. ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, gamma -butyrolactone, and/or sulfolane. Preferred Parameters: Surface of electrode is contacted with liquid so that amount of lithium bis(oxalate) borate is 5-130x 10-3 mol/m2.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: Electrolyte contains matrix polymer (B) e.g. polyether-based polymer, fluorine-type polymer, such as polyethylene oxide, polypropylene oxide, polyvinyl fluoride, polyvinylidene fluoride, polyvinylidene-fluoride hexafluoropropylene copolymer, polyvinylidene fluoride-hexafluoride acetone copolymer, and/or polytetrafluoroethylene, polyacryl-type polymer, polyacrylonitrile, polyphosphazene, and/or polysiloxane.