TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The radical non-reactive group is 1-20C aliphatic hydrocarbon, 5-20C aromatic hydrocarbon, or 1-20C ester group. The (meth)acrylate ester group is -OC(=O)RnOC(=O)CH=CH2, -OC(=O)RnOC(=O)C(CH3)=CH2, or -OC(=O)Rn-CH=CH2. The radical non-reactive group is -OC(=O)R'n, -OC(=O)RmOR'n, or -OC(=O)RmOC(=O)R'n.n = 1-20;R = (halogenated) alkylene group, (halogenated) arylene group, (halogenated) alkyl arylene group, or (halogenated) aralkylene group;andR' = (halogenated) alkyl group, (halogenated) aryl group, (halogenated) alkylaryl group, or (halogenated) aralkyl group.The molar ratio of (meth)acrylate ester group to the radical non-reactive group is 1:0.01-1:100. The peroxide is isobutyl peroxide, lauroyl peroxide, benzoyl peroxide, m-toluoyl peroxide, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxy-bi-valerate, t-butyl-oxy-neodecanate, di-isopropyl peroxy di-carbonate, di-ethoxy peroxy di-carbonate, bis(4-t-butyl cyclohexyl) peroxy di-carbonate, di-methoxy isopropyl peroxy di-carbonate, di-cyclohexyl peroxy di-carbonate, or 3,3,5-trimethyl hexanoyl peroxide. The peroxide is present at 0.3-5 parts by weight (pbw) based on 100 pbw of polyester (meth)acrylate or its polymer. The polyester polyol is tri-alkylol. The tri-alkylol is tri-methylol, tri-ethylol and tri-propylol, glycerols, or erythritol. The erythritol is penta-erythritol or di-penta-erythritol. The mixing ratio by weight of polyester (meth)acrylate or its polymer to the electrolytic solution is 1:2-1:50. The lithium salt is lithium-phosphorus hexa-fluoride (LiPF6), lithium-bromine tetra-fluoride, lithium-antimony hexa-fluoride, lithium-arsenic hexa-fluoride, lithium tetra-chloride, lithium-carbon-tri fluoro sulfite, lithium-(carbon trifluoro-sulfur dioxide-nitride, lithium-aluminum tetra-oxide, lithium aluminum tetra-chloride, lithium nitride fluorocarbon sulfur dioxide (carbon-fluoro-sulfur dioxide), lithium chloride, or lithium iodide. The organic solvent is ethylene carbonate (EC), gamma-butyrolactone, propylene carbonate, diethyl carbonate (DEC), di-methyl carbonate, methyl ethyl carbonate, diethyl carbonate, vinylene carbonate, butylene carbonate, benzonitrile, acetonitrile, tetrahydrofuran, 2-methyl hydro-furan, dioxolane, 4-methyl dioxolane, N, N-di-methyl formamide, di-methyl acetamide, di-methyl sulfoxide, 1,2-dimethoxy ethane, sulfolane, di-chloroethane, chlorobenzene, nitrobenzene, methyl propyl carbonate, methyl isopropyl carbonate, ethyl butyl carbonate, di-propyl carbonate, di-isopropyl carbonate, di-butyl carbonate, di-ethylene glycol, or di-methyl ether. The fluorinated aromatic hydrocarbon is 2-fluorotoluene, 3-fluorotoluene, and/or 4-fluorotoluene. The lithium battery also comprises separator between cathode and anode. The separator has single or multi-layered structure of polyethylene or polypropylene/polyethylene.Preferred Methods: The method also comprises subjecting the composition coated on the support substrate to heat treatment or ultraviolet radiation. The heat treatment is carried out at 25-110degreesC. EXAMPLE - A mixture of (mol) di-pentaerythritol (1), epsilon-caprolactone (2) and toluene solvent was added to tetra-propyl-titanate catalyst (100 mg) and reacted at 50degreesC to synthesize di-pentaerythritol derivative monomer with some terminal hydroxy groups substituted by pentyl alcohol. Pentaerythritol derivative (1 mol), acrylic acid (4 mol), and butyl carboxylic acid (2 mol) were reacted to obtain polyester hexa-acrylate compound with hydroxy groups. LiPF6 (1.3 mol/L) was dissolved in mixed solvent of EC and DEC (ratio 3:7). Polyester hexa-acrylate compound (1g) and lauroyl peroxide (10 mg) was added to obtain a composition for polymer electrolyte. N-methyl pyrrolidone (50g), polyvinylidene fluoride (PVDF) (3g), C-10 and super-P conductive carbon (3g) were mixed to prepare a slurry. Aluminum foil was coated with slurry to 15mum thick to prepare a cathode. Mezocarbon fiber (90g) and polyvinylidene fluoride (PVDF) (10g) were mixed to produce a slurry. Copper foil was coated with slurry to 170mum thick to form anode. A separator was interposed between cathode and anode, wound and placed into battery case. The composition was injected to the battery case and heated at 70degreesC for 2 hours to perform thermal polymerization to complete lithium secondary battery.