TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: 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. 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. 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 concentration of lithium salt in the electrolyte is 0.5-3 M.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The ester solvent is chosen from methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, gamma -butyrolactone, gamma -valerolactone, gamma -carprolactone, delta -valerolactone and epsilon -carprolactone, preferably methyl propionate and/or ethyl propionate. The ratio of methyl propionate and ethyl propionate is 10:90-90:10 with respect to total content of ester solvent.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The carbonate-type solvent further comprises linear carbonate chosen from dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, methylpropyl carbonate and ethylpropyl carbonate, and cyclic carbonate 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 content of carbonate.