TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The electrochemical device further comprises lithium metal oxide cathode(s), porous separator(s), and anode(s).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The catalyst contains boron. It comprises B(C6F5)3 or triethylamine. The solvent comprises toluene. The lithium salt comprises lithium chlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium hexafluorophosphate, LiCF3SO3, Li(CF3SO2)2N, Li(CF3SO2)3C, LiN(SO2C2F5)2), lithium alkyl fluorophosphates, lithium oxalatoborate, lithium bis(chelato)borates, LiPF3(C2F5)3, or LiPF3(CF3)3, LiB(C2O4)2. The lithium bis(chelato)borate has 5-10 (preferably 5-7) membered rings. The network forming polymer comprises poly(alkylene oxide) dialkyl alkyl acrylates of formula: R=C(R')-C(O)-(-OCH2C(X)H2-)n-C-C(O)-C(R")=R.R=1-10C alkylidene;R', R"=H, 1-10C alkyl, and/or 2-12C alkenyl;X=H or Me;n = 1-15.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The electrolyte is a liquid comprising cyclic poly(siloxane-g-ethylene oxide) and alkali metal salt(s); or a solid comprising cyclic poly(siloxane-g-ethylene oxide), alkali metal salt(s) and solidifying polymer(s). The solidifying polymers are network forming polymer or solid polymer. It comprises poly(ethylene oxide) dimethacrylate. The electrolyte is entrapped inside crosslinked polymer networks, or mixed with solid polymers. The solid polymers comprise polyacrylonitrile (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinyl acetate), polystyrene, and/or poly(ethylene oxide) (PEO). The electrolyte further comprises a lithium salt. The molar ratio of (EO)/(Li) is 5-50.Preferred Properties: The poly(siloxane-g-ethylene oxide) has an average molecular weight of less than or equal to20000 g/mol, and dynamic viscosity of less than or equal to10000 cps.Preferred Method: The components are heated to 70-75degreesC. The volatiles removing step comprises heating to 150degreesC and 0.1 torr. EXAMPLE - To 500-mL flask was added D4-H (46.92 g), tri(ethyleneglycol) monomethyl ether (128.22 g), toluene (210 mL), and tris(pentafluorophenyl)boron (0.16 g) under nitrogen atmosphere. The clear solution was heated to 70-75degreesC. The reaction mixture was continuously stirred for 48 hours until the bubbling stopped. After the solvent was removed, the colorless liquid was purified to afford a colorless oil (158.8 g). The obtained eight-membered ring poly(siloxane-g-3 ethylene oxide) and LiN(SO2CF3) were mixed with the ratio of (EO)/(Li) of 32:1. The resulting polymeric electrolyte had an ionic conductivity of 1.13 x 10-4 S/cm at 25degreesC.