TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The poly(ethyleneoxide)siloxane is compound (Ib), (Ic) or (Id) (preferably 2-(2-(2-(2-methoxy)ethoxy)ethoxy)ethoxy trimethyl silane). The crosslinking agent is a compound of formula R9-CH=C(R10)-C(=O)-(O-CH2-CH-X)n-CH2-C(=O)-C(R11)=CH-R12 (VII). The monofunctional monomeric compound is a compound of formula R13-(O-CH2-CH-X)n-CH2-C(=O)-C(R14)=CH-R15 (VIII). At least one salt is a lithium salt selected from LiClO4, LiBF4, LiAsF6, LiPF6, Li(PF2(C2O4)2), Li(PF4(C2O4)), Li(CF3SO3), Li(N(CF3SO2)2), Li(C(CF3SO2)3), Li(N(SO2C2F5)2), lithium alkyl fluorophosphate, Li(B(C2O4)2) and/or Li(BF2(C2O4)). The radical reaction initiator is a thermal initiator and/or photoinitiator. The thermal initiator is an azo compound, peroxide compound, and/or bismaleimide. The photoinitiator is 1-hydroxyl-phenyl-ketone, benzophenone, 2-hydroxyl-2-methyl-1-phenyl-propanone, 2-hydroxyl-1-(4-(2-hydroxy)phenyl)-2-methyl-1-propanone, methylbenzoylformate, oxy-phenyl-acetic acid 2-(2-oxo-2-phenyl-acetoxy-ethoxy)-ethyl ester, oxy-phenyl-acetic 2-(2-hydroxy-ethoxy)-ethyl ester, alpha , alpha -dimethoxy- alpha -phenylacetophenone, 2-benzyl-2-(dimethylamino)-1-(4-(4-morpholinyl)phenyl)-1-propanone, diphenyl (2,4,6-trimethylthio)phenyl)-phosphine oxide, phosphine oxide, phenyl bis(2,4,6-trimethyl benzoyl), bis( eta -5-2,4-cyclopentadien-1-yl)bis(2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl)titanium and/or iodonium(4-methylphenyl)-(4-(2-methylpropyl)phenyl)-hexafluorophosphate.R9-R12=T1;X=H, methyl or ethyl;n=1-15;R13=1-12C alkyl;R14 and R15=T1.    TECHNOLOGY FOCUS - POLYMERS - Preferred Electrolyte: The electrolyte (E1) comprises the poly(ethyleneoxide)siloxane (5-95 wt.%), crosslinking agent (5-60 wt.%), and monofunctional monomeric compound (10-50 wt.%), where the wt.% is calculated on the total weight of the at least one poly(ethyleneoxide)siloxane, the at least one crosslinking agent, the at least one monofunctional monomeric compound, the at least one salt, and the at least one radical reaction initiator. The electrolyte (E1) further comprises a siloxanyl carbonate co-solvent (preferably 1-(1-trimethylsiloxanylethyl)ethylene carbonate) and at least one electrode stabilizing additive, which is oxidized or polymerized on the surface of positive electrodes, or is reduced or polymerized on the surface of negative electrodes. The electrolyte (E1) is incorporated into a porous medium selected from a polyolefin separator, polyolefin nonwoven type separator, or polycarbonate microporous membrane. Preferred Definitions:    PEO1-PEO4=groups of formulae -O-(CH2-CH2-O-)n-R7 (IIIa) or -(CH2)m-O-(CH2-CH2-O-)n-R7 (IIIb);    R7=T1 or -(CH2)q-(1,3)dioxolan-2-one (substituted on 4 position by R8);    R8=T1;    m=1-8;    n=0-20;and    q=0-8.    EXAMPLE - A gel electrolyte comprising poly(ethyleneglycol)dimethacrylate (20 wt.%), poly(ethylene glycol) ethyl ether methacrylate (20 wt.%), siloxane electrolyte e.g. Li(B(C2O4)2) (59.7 wt.%) and benzoylperoxide (0.3 wt.%) was prepared. The siloxane electrolyte was dissolved in a mixture of 2-(2-(2-(2-methoxy)ethoxy)ethoxy)ethoxy trimethyl silane and 1-(1-trimethylsiloxanyl-ethyl)-ethylene carbonate (3:2 wt.%). The gel electrolyte was carried out for determination of cyclic voltammogram, and showed a wide voltage window up to 4.5 Volts vs Li+/Li.