TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Property: The lithium secondary battery formed using the battery has less than 10% of thickness variation rate which is caused by charging to 4.2V and leaving at 90 degrees C for 4 hours.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The negative ion of lithium salt is chosen from fluoride, chloride, bromide, iodide, nitrate, boron fluoride, perchlorate, hexafluorophosphate, and group of formulae: N(CN)2-, (CF3)2PF4-, (CF3)3PF3 -, (CF3)4PF2-, (CF3)5PF-, (CF3)6P-, CF3SO3-, CF3CF2SO3-, (CF3SO2)2N-, (FSO2)2N-, CF3CF2(CF3)2CO-, (CF3SO2)2CH-, (SF5)3C-, (CF3SO2)3C-, CF3(CF2)7SO3-, CF3CO2-, CH3CO2-, SCN-, and (CF3CF2SO2)2N-. Preferred Properties: The electrolyte has potential window of 0.4-5 V, viscosity of less than 50 cP, or 4-30 cP and ionic conductance of 1-10 mS/cm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The amide compound is chosen from N-methoxy methylcarbamate, N-methoxy ethylcarbamate, N-methoxy-N-methyl methylcarbamate, N-methoxy-N-methyl ethylcarbamate, N-methoxy-N-methyl propylcarbamate, N-methoxy-N-methyl butylcarbamate, N-methyl-N-methoxyethyl methoxyethyl carbamate, N-methoxy N-methyl 2,2,2-trifluoroethyl carbamate, N-methoxy N-methyl 2-fluoroethyl carbamate, N-methoxy N-methyl perfluoropropyl carbamate, N-methoxy-N-methyl 2-(perfluorohexyl)ethyl carbamate, N-methoxy-N-methyl 6-(perfluorobutyl)hexyl carbamate, and N-methoxyoxazolidinone. The electrolyte further comprises carbonate-based compound chosen from chain carbonate and cyclic carbonate. The carbonate-based compound is chosen from polypropylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, butylene carbonate, methylpropyl carbonate, ethylpropyl carbonate, dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone, ethyl methyl carbonate, and ( gamma )-butyrolactone. Preferred Composition: The content of carbonate-based compound is 5-200 parts weight with respect to total of 100 parts weight of amide compound and lithium salt. The mole ratio of amide compound and lithium salt is 1-8:1.