TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The lithium salt comprises at least one selected from LiBF4, LiPF6, LiAsF6, LiSbF6, and LiPF3(CF2CF3).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The electrolyte composition further comprises an acrylate monomer of formula CH2=C(R6)-C(=O)-O-R7-R8 (III).R6=H or methyl;R7=1-20C alkylene (optionally substituted by halo, cyano, -OR, -C(=O)R'a, -C(=O)OR'a, -OCO(OR'a), -(X)n-NH2, -C=N(R), -SR'a, -S(=O)R'a, -S(=O)2R'a, -PR'a, 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 2-20C alkylene oxide, 3-30C cycloalkyl, 6-30C aryl, 6-30C aryloxy group, or 6-30C heteroaryl group);R=H, 1-10C alkyl, or 6-20C aryl;X=1-10C alkyl or 1-10C alkoxy;n=0-10;R8=H, fluorine, 1-20C alkyl, or 1-20C fluorinated alkyl;R'a=H, 1-10C alkyl, or 6-20C aryl.Preferred Components: The multi-functional urethane acrylate-based monomer comprises a urethane diacrylate-based monomer of formula (II). The polyethylene oxide repeating unit of the macro azo initiator has a number average molecular weight (Mn) of 200-20000 grams per mole. The macro azo initiator has a number average molecular weight (Mn) of 10000-100000 grams per mole. The multi-functional urethane acrylate-based monomer has a number average molecular weight (Mn) of 250-100000 grams per mole. The acrylate monomer (III) comprises at least one selected from methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, hexyl acrylate, hexyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, 2,2,2-trifluoroethyl acrylate, 2,2,2-trifluoroethyl methacrylate, 2,2,3,3-tetrafluoropropyl acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 1,1,1,3,3,3-hexafluoro isopropyl acrylate, 1,1,1,3,3,3-hexafluoro isopropyl methacrylate, 2,2,3,3,4,4,4-heptafluorobutyl acrylate, 2,2,3,3,4,4,4-heptafluorobutyl methacrylate, 2,2,3,3,4,4,5,5-octafluoropentyl acrylate, 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate, 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl acrylate, 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl methacrylate, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl acrylate, and 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl methacrylate. The organic solvent is a high-dielectric constant (high-k) solvent, a low-boiling point solvent, or a mixed solvent of it. The amount of the macro azo initiator is 0.1-50 wt.% based on a total weight of the electrolyte composition. The amount of the multi-functional urethane acrylate-based monomer is 1-50 wt.% based on a total weight of the electrolyte composition. The amount of the acrylate monomer (III) is 0.1-30 wt.% based on a total weight of the electrolyte composition.n=1-1000;R1, R2, and R3=1-20C alkylene, 5-20C cycloalkylene group, or 6-20C arylene (optionally substituted by halo, cyano, -OR, -C(=O)R'a, -C(=O)OR'a, -OCO(OR'a), -(X)n-NH2, -C=N(R'a), -SR'a, -S(=O)R'a, -S(=O)2R'a, -PR'a, 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 2-20C alkylene oxide, 3-30C cycloalkyl, 6-30C aryl, 6-30C aryloxy, or 6-30C heteroaryl);R=H, 1-10C alkyl, or 6-20C aryl;X=1-10C alkyl, or 1-10C alkoxy;n=0;R4 and R5=H;R1=H, 1-10C alkyl, or 6-20C aryl.Preferred Electrolyte: The block copolymer comprises a repeating unit of formula (IV). The block copolymer further comprises an acrylate of formula -CH2-C((R14)(C(=O)-O-R15-R16))q- (V). The block copolymer comprises a polyethylene oxide group (-CH2CH2O) and a urethane group (-NHCOO). The block copolymer forms a cross-linked network matrix.a=1-2000;b=5-200;p=1-1000;R9, R10, and R11=1-20C alkylene, 5-20C cycloalkylene group, or 6-20C arylene group (all optionally substituted by halo, cyano, -OR, -C(=O)R'a, -C(=O)OR'a, -OCO(OR'a), -(X)n-NH2, -C=N(R'a), -SR'a, -S(=O)R'a, -S(=O)2R'a, -PR'a, 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 2-20C alkylene oxide, 3-30C cycloalkyl, 6-30C aryl, 6-30C aryloxy, or 6-30C heteroaryl);R'a=H, 1-10C alkyl, or 6-20C aryl;q=1-5000;R12 and R13=H;R14=H or methyl;R15=1-20C alkylene (optionally substituted by halo, cyano, or -OR);R16=H, fluorine, 1-20C alkyl, or 1-20C fluorinated alkyl.. EXAMPLE - 1.3M Lithium phosphate hexafluorate was dissolved in a mixed solution (10 ml) of ethylene carbonate (EC), ethylmethyl carbonate (EMC), and diethylene carbonate (DEC) in a volume ratio of 3:2:5, to obtain a solution. A macro azo initiator (2 wt.%) of formula -(C(=O)-CH2CH2-NC((CH3)(CN))=NC((CH3)(CN))-CH2CH2-C(=O)-O-(CH2CH2O)t)m- (VI) having total molecular weight of 20000 and including a polyethylene oxide repeating unit having an Mn of 2000, and a urethane diacrylate monomer (5 wt.%) of formula (VII) below were added to the solution, and an electrolyte composition was prepared.