TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Electrolyte: The electrolyte comprising the poly-or oligo-carbonate group is (Ia).Preferred Composition: The electrolyte contains at least one organic solvent which is a carbonate-base compound and at least one inorganic oxide. Preferred Electrolyte Salt: The electrolyte salt is an alkali metal salt, quarternary ammonium salt or a quarternary phosphonium salt.Preferred Method: The polymer compound is obtained by polymerizing polymerizable functional group (II) and/or (III).The solid polymer electrolyte is produced by disposing at least one heat and/or active ray polymerizable compound, the polymerizable functional group and a polymerizable composition containing at least one organic solvent, at least one inorganic oxide on the support, polymerizing the polymerizable composition and subsequently contacting the polymer obtained with an electrolytic solution to impregnate the electrolyte salt.Preferred Compound: The polymerizable compound is (V).m' = 1 or 2;w = 1-10C atomsx = 0-10 EXAMPLE - 40.0 g of Compound (VI) of average molecular weight 800, and 15.5 g of methacryloylxyethyl isocyanate (MOI) were dissolved in 200 ml of thoroughly purified THF in a nitrogen atmosphere. 0.44 g of dibutyltin dilaurate was subsequently added and the resulting solution was reacted at 25degreesEC for 15 hours. A colorless product was obtained. Compound (VIII) was produced by reacting compound (VI) and (MOI) at 1:2. 2 g of compound (VIII), 1.8 g of ethylene carbonate, 4.2 g of methyl carbonate, .60 g of LiP F6 and 0.010 g of 2,4,6-trimethylbenzoyl diphenylphosphene oxide were thoroughly mixed in an argon atmosphere. A photopolymerisable composition having a moisture content of 30 ppm by Karl Fischer method was obtained. The composition was applied on a PET film in an argon atmosphere and irradiated for 10 minutes. The polymer (compound VIII) film impregnated with an EC/EMC-base electrolytic solution and having thickness of 30 mum was obtained. The resulting film had an ion conductivity of 2.5x10-3 S/cm or 0.6x10-3 S/cm at 25degreesEC or -20degreesEC respectively measured by impedance method.