TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The cathode active material comprises amorphous carbon. The lithium metal phosphate is lithium iron phosphate having olivine crystalline structure of formula: Li1+aFe1-xM'x(PO4-b)Xb, where M' is aluminum, magnesium, nickel, cobalt, manganese, titanium, gallium, copper, vanadium, niobium, indium, zinc or yttrium, and x is 0-0.5. The lithium iron phosphate having olivine crystalline structure is coated with conductive carbon. The concentration of lithium salt in the electrolyte is 0.5-3 M. The lithium salt is chosen from lithium chloride, lithium bromide, lithium iodide, lithium perchlorate, lithium tetrafluoroborate, lithium boron chloride (LiB10Cl10), lithium hexafluorophosphate, lithium trifluoromethanesulfonate, lithium trifluorroacetate, lithium hexaflouroarsenate, lithium hexafluroantimonate, lithium aluminum chloride, lithium bis(trifluoromethylsulfonyl)imide, lithium trifluoromethanesulfonate, lithium methanesulfonate, lithium tetraphenylborate, and imide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The glyme-based solvent is chosen from ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether and triethyleneglycol diethylether, preferably diethylene glycol dimethyl ether. The ether-based solvent is chosen from tetrahydrofuran, 2-methyltetrahydrofuran, dimethoxyethane and dibutyl ether. The content of glyme-based solvent is 25:75-65:45 based on total volume of nonaqueous solvent. The ratio of volume of ether-based solvent and glyme-based solvent (A) with respect to volume of carbonate type solvent is 15:85-85:15 based on total weight of electrolyte. The electrolyte comprises further comprises a carbonate-type solvent comprising linear carbonate and cyclic carbonate. The linear carbonate is chosen from dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, methyl propyl carbonate and ethyl propyl carbonate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The cyclic carbonate is chosen from ethylene carbonate, polypropylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate and 2,3-pentylene carbonate. The ratio of cyclic carbonate and linear carbonate is 1:4-4:1 with respect to total content of carbonate-type solvent.