TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: In the device, the anode and cathode are separated from each other by a porous separator. The cathode is a lithium metal oxide cathode. The anode is a carbon or lithium metal anode.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkali metal salt is a lithium salt, preferably lithium-bisoxalatoborate, lithium difluoro(oxalate)borate, lithium perchlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, lithium triflate, lithium bistrifluoromethylsulfonyl imide, lithium tris(trifluoromethanesulfonyl) methane, lithium bisperfluoroethylsulfonyl imide, lithium alkyl fluorophosphates or a mixture of two or more of the above components.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The stabilizing additive is (I) or (II). The concentration of the additive in the electrolyte is 0.0005-50 wt.%. The polar solvent is ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dipropyl carbonate, bis(trifluoroethyl) carbonate, bis(pentafluoropropyl)carbonate, trifluoroethyl methyl carbonate, pentafluoroethyl methyl carbonate, heptafluoropropyl methyl carbonate, perfluorobutyl methyl carbonate, trifluoroethyl ethyl carbonate, pentafluoroethyl ethyl carbonate, heptafluoropropyl ethyl carbonate, perfluorobutyl ethyl carbonate, fluorinated oligomers, dimethoxyethane, triglyme, dimethylvinylene carbonate, tetraethyleneglycol, dimethyl ether, polyethylene glycols, sulfones, butyrolactone or a mixture of two or more of the above solvents. Preferred Definitions:    R1-R3 = CH3, C2H5, n-propyl, isopropyl, n-butyl, sec-butyl, tert.butyl, vinyl, 2-propenyl, 3-butenyl, acetylenyl, 2-propynyl or 3-butyryl;    R4, R5 = R1 or H; and    n = 1-4 (for (IIIa)) or 0 or 1 (for (IIIb-IIIe)).    SPECIFIC COMPOUNDS - The use of 12 compounds (I) is specifically claimed e.g. 1,3,5-trimethyl-(1,3,5)triazinane-2,4,6-trione of formula (Ia), 1,3,5-trivinyl-(1,3,5)triazinane-2,4,6-trione, 1,3,5-triethynyl-(1,3,5)triazinane-2,4,6-trione, 1,3,5-triallyl-(1,3,5)triazinane-2,4,6-trione and 1,3,5-tri-prop-2-ynyl-(1,3,5)triazinane-2,4,6-trione. The use of 9 compounds (II) is specifically claimed e.g. 3-oxa-bicyclo(3.1.0)hexane-2,4-dione of formula (IIa), 3-oxa-bicyclo(3.2.0)heptan-2,4-dione, 3-oxa-bicyclo(3.2.0)hept-6-ene-2,4-dione, tetrahydro-cyclopenta(c)furan-1,3-dione and 4,6a-dihydro-3aH-cyclopenta(c)furan-1,3-dione.    EXAMPLE - Typical electrolyte comprised of: 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (1 wt.%); 1.2 M of lithium hexafluorophosphate; and ethylene carbonate and ethyl methyl carbonate in a weight ratio of 3:7.