TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The transmitted salt is lithium salt. The anion of the lithium salt is chosen from fluorine, chlorine, bromine, iodine, nitrate, cyanide (N(CN)2-), tetrafluoroborate, perchlorate, hexafluorophosphate, fluorophosphates ((CF3)2PF4-, (CF3)3PF3-, (CF3)4PF2-, (CF3)5PF- and (CF3)6P-), trifluoromethanesulfonate, difluoromethanesulfonate, fluorocompounds ((CF3SO2)2N-, (FSO2)2N-, CF3CF2(CF3)2CO-, (CF3SO2)2CH-, (SF5)3C-, (CF3SO2)3C-, CF3(CF2)7SO3-, CF3CO2- and (CF3CF2SO2)2N-), acetate or thiocyanate. The lithium secondary battery includes an anode active material layer comprising lithium metal, carbonaceous material and/or metal compound. The cathode layer including the cathode is oxide containing lithium comprising lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide (LiMnO2 and LiMn2O4), lithium nickel cobalt manganese oxide (Li(NiaCobMnc)O2 and Li(Nia1Cob1Mnc1)O4), lithium nickel manganese oxide (LiNi1-yMnyO2), lithium manganese nickel oxide (LiMn2-zNizO4), lithium manganese cobalt oxide (LiMn2-zCozO4), lithium cobalt phosphate and/or lithium iron phosphate, where a, b and c are greater than 0 but less than 1, a+b+c is 1, y is greater than or equal to 0 but less than 1, a1, b1 and c1 are greater than 0 but less than 2, a1+b1+c1 is 2, and z is greater than 0 but less than 2.    TECHNOLOGY FOCUS - METALLURGY - Preferred Components: The metal compound is silicon, germanium, tin, lead, phosphorus, antimony, bismuth, aluminum, gallium, indium, titanium, manganese, iron, cobalt, nickel, copper, zinc, silver, magnesium, strontium and/or barium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The branched alkyl ester compound (I) is isobutyl propionate, isoamyl propionate, isobutyl butyrate and/or isopropyl propionate. The linear alkyl ester compound (II) is methyl propionate, ethyl propionate, propyl propionate, butyl propionate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl butyrate, ethyl butyrate, propyl butyrate and/or butyl butyrate. The organic solvent is chain carbonate, cyclic carbonate ether, ester and/or amide. The chain carbonate is dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, methyl propyl carbonate and/or ethyl propyl carbonate. The cyclic carbonate is ethylene carbonate, polypropylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, vinylene carbonate and/or vinyl ethylene carbonate and their halides. The ether is dimethylether, diethylether, dipropyl ether, methyl ethyl ether, methyl propyl ether and/or ethyl propyl ether. The non-aqueous liquid electrolyte is ring-shaped sulfite, saturation sultone, unsaturation sultone and/or non-ring-shaped sulfone. Preferred Composition: The volume ratio of the branched alkyl ester compound and linear alkyl ester compound is 80:20 to 20:80. Preferred Definitions:    R1,R3,R4=methyl, ethyl, propyl or butyl;and    R2=isopropyl, isobutyl, isopentyl, isohexyl, sec-butyl, sec-pentyl, tert-butyl or tert-pentyl.