TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compounds: The lithium salt may have fluoride (F-), chloride (Cl-), bromide (Br-), iodide (I-), nitrate (NO3-), tetrafluoroborate (BF4-), perchlorate (ClO4-), or thiocyanate (SCN-) as anion. The metal or metal oxide is tungsten oxide (WO3), molybdenum oxide (MoO3), lithium chromate (LiCr3O8), lithium vanadate (LiV3O8), titanium sulfide (TiS2), or oxides of formula LixTi5/3-yLyO4 having a spinel type structure.L = Group 2-16 element except Ti and O;x = 4/3 - 7/3; andy = 0 - 5/3.Preferred Property: The metal or metal oxide has a potential versus lithium potential (Li/Li+) of greater than or equal to1 V.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The amide group-containing compound is acetamide, urea, methyl urea, caprolactam, valerolactam, trifluoroacetamide, methyl carbamate, or formamide. The lithium salt may have N(CN)2-, RSO3-, RCOO-:PF6, (CF3)2PF4-, (CF3)3PF3-, (CF3)4PF2-, (CF3)5PF-, (CF3)6P-, (CF3SO3-)2, (CF2CF2SO3-)2, (CF3SO3)2N-, CF3CF2(CF3)2CO-, (CF3SO2)2CH-, (SF5)3C-, (CF3SO2)3C-, CF3(CF2)7SO3-, CF3CO2-, CH3CO2-, or (CF3CF2SO2-)2N as anion. The eutectic mixture is a cyclic lithium-containing compound of formula (1).R1 = H, 1-20C alkyl, alkylamine, alkenyl, aryl, or allyl;R2 = H, halo, 1-20C alkyl, alkenyl, aryl, or allyl;X = H, O, C, N, or S, provided that when X=H, then R2=null;Y = anion capable of forming a salt with lithium; andn = 0-10, provided that when n=greater than 1, then X=C, O, N or S.The electrolyte may be a liquid-type electrolyte using the eutectic mixture alone.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The electrolyte may be a gel polymer-type electrolyte formed by polymerization of an electrolyte pre-gel comprising the eutectic mixture and monomers capable of forming a gel via polymerization. The electrolyte pre-gel further comprises a polymerization initiator or a photoinitiator. The electrolyte may comprise a polymer or gel polymer impregnated with the eutectic mixture. The polymer is polymethyl methacrylate, polyvinylidene difluoride, polyvinyl chloride, polyethylene oxide, or polyhydroxyethyl methacrylate.Preferred Composition: The electrolyte pre-gel comprises the eutectic mixture (x), the monomers capable of forming a gel polymer (y) and the polymerization initiator (z) in a weight ratio of x:y:z, where x is 0.5-0.95, y is 0.05-0.5 and z is 0.00-0.05, provided that x+y+z=1.Preferred Monomers: The monomer is a vinyl monomer, preferably (meth)acrylonitrile, methyl (meth)acrylate, methyl styrene, vinyl ester, vinyl chloride, vinylidene chloride, acrylamide, tetrafluoroethylene, vinyl acetate, methyl vinyl ketone, ethylene, styrene, para-methoxystyrene, or para-cyanostyrene. EXAMPLE - Lithium titanate (Li3/4Ti5/3O4) having a potential against lithium potential of 1.5 V as an anode active material, artificial graphite and binder were mixed in a weight ratio of 94:3:3 and N-methylpyrrolidone was added to the resultant mixture to provide a slurry which was applied onto copper foil and then dried at 130degreesC for 2 hours to provide an anode. Purified acetamide (5 g) and Li(CF3SO2)2N (6 g) were stirred at room temperature under nitrogen for 12 hours to provide a eutectic mixture (11 g). The eutectic mixture had electrochemical window of 0.7-4.4 V. The eutectic mixture, 2-hydroxyethyl methacrylate monomer and azobisdimethyl valeronitrile as a heat polymerization initiator were mixed in a weight ratio of 8:2:0.01. The resultant mixture was allowed to polymerize at 55degreesC for 1 hour to form a gel polymer electrolyte. A secondary battery comprising cathode, anode, separator and eutectic mixture electrolyte was obtained.