TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: (I) is 3-fluoroanisole, 3-chloroanisole, 3-bromoanisole, 4-fluoroanisole, 4-chloroanisole, 4-bromoanisole, 2,4-difluoroanisole, 3,5-difluoroanisole, and/or 3-chloro-5-fluoroanisole. The sulfone-based compound is formulae (2)-(4).R2-S(O)2-R3 (2)R2, R3 = primary, secondary or tertiary alkyl group, alkenyl group or aryl group.The sulfone-based compound is preferably methyl sulfone, vinyl sulfone, phenyl sulfone, benzyl sulfone, tetra methylene sulfone, and/or butadiene sulfone. (I) is added at 0.1-5 wt.%. The poly(ester)(metha)acrylate is polymer derived from (polyester) polyol with at least three hydroxyl group. A portion of the whole of the hydroxyl groups is substituted with (metha)acrylate ester is substituted with group having no radical reactivity. The (polyester) polyol is tri alkylol, glycerol, or erythritol. The (meth)acrylate ester is -OC(=O)(CH2)nOC(=O)CH=CH2, or -OC(=O)(CH)nOC(=O)C(CH3)=CH2.n = 1-20The group with out radical reactivity is -OC(=O)(CH2)3, -OC(=O)Ar, -OC(=O)(CH2)nOC(=O)(CH2)NOC(=O)CH=CH2, or -(C=O)CH=CH2.Ar = (substituted) aromatic hydrocarbon.The (meth)acrylate ester is used at a mole ratio of 1:0.01-1:100. The electrolyte also comprises organic peroxide. The organic peroxide is used at 0.3-5 parts by weight on the basis of 100 parts by weight at poly(ester)(meth)acrylate. The organic peroxide is isobutyl peroxide, lauroyl peroxide, benzoyl peroxide, m-toluoyl peroxide, t-butylperoxy-2-ethyl hexanoate, t-butyl peroxy bibarate, t-butyl-oxy-neo-decanate, di isopropyl peroxy di carbonate, di ethoxy peroxy di carbonate, bis-(4-t-butylcyclohexyl)peroxy di carbonate, di methoxy isopropyl peroxy di carbonate, di-cyclo-hexyl-peroxy di carbonate, or 3,3,5-trimethyl hexanoyl peroxide. The lithium salt is LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiCF3SO3, Li(CF3SO2)2N, LiC4F9SO3- , LiSbF6, LiAlO4, LiAlCl4, LiN(CxF2x+1SO2)(C- yF2y+1SO2) (wherein x and y are natural numbers), LiCl, and LiI.x, y = natural number.The lithium salt is used at 0.6-2M. The non-aqueous solvent is carbonate, ester, ether, or ketone. The carbonate is di methyl carbonate, diethyl carbonate, di propyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, propylene carbonate (PC), or butylene carbonate. The electrolyte comprises mixed solvent of cyclic carbonate and chain carbonate. The electrolyte comprises mixed solvent of carbonate solvent and aromatic hydrocarbon solvent. The aromatic hydrocarbon solvent is compound of formula (7).R4 = 1-10C alkyl;andq = 1-6.The aromatic hydrocarbon is benzene, fluoro benzene, toluene, tri-fluoro-toluene, or xylene. The carbonate solvent and aromatic hydrocarbon solvent are mixed at volume ratio of 1:1-30:1. The composition for polymer also comprises base catalyst.Preferred Methods: The method also comprises heat-treating or ultraviolet radiating the solid polymer electrolyte to polymerized the poly(ester)(meth)acrylate or polymer poly(ester)(meth)acrylate at 40-110 degrees C. EXAMPLE - Di-penta-erythritol (1 mole) and epsilon-caprolactone (2 mole) were added to toluene solvent, tetra-propyl-titanate catalyst (0.01 wt.%) was added and reaction was carried out at 50 degrees C to synthesize a di-penta-erythritol monomer. A portion of hydroxyl group was substituted with epsilon-caprolactone, di-penta-erythritol moiety (1 mole), acrylic acid (4 mole), ad butyl carbonic acid were reacted to obtain polyester hexa-acrylate compound where four OH of the monomer were substituted with -OC(=O)(CH2)5OC(=O)CH=CH2 and two OH were substituted with -OC(=O)(CH2)3CH3. Ethylene carbonate/ethyl methyl carbonate/PC/fluoro-benzene were mixed at volume ratio of 30/55/5/10 to prepare organic mixed solvent. LiPF6 (1.15M) was added to the solvent and electrolyte additive with chloro anisole (3 wt.%) and polyester hexa-acrylate compound was added to the solution to prepare the electrolyte.