TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Electrolyte: The electrolyte is obtained by solidifying a composition containing anionic monomer, cationic monomer and non-ion dissociative polymerizable monomer which is compatible with the ionic monomers, by heat-processing. The anionic monomer has a polymerizable functional group and a counter-cation which consists of alkali metal ion such as lithium ion, sodium ion and potassium ion. The cationic monomer has a polymerizable functional group and a counter-anion chosen from halogen-containing anion, mineral acid anion and organic acid anion. The organic acid anion is chosen from RSO3- and RCO2-, where R is alkyl, allyl, alkenyl, aralkyl, aralkenyl, alkoxy alkyl, acyloxy alkyl, sulfo alkyl or aryl group or aromatic heterocyclic residue. The anionic monomer has anionic functional groups such as carboxyl, sulfoxyl, phosphoxyl and/or bis alkyl sulfonimide group, preferably sulfoxyl group. The cationic monomer has cationic functional group such as ammonium group, oxonium group, sulfonium group and/or phosphonium group, preferably ammonium group. The ionic compound consists of an alkali metal salt and/or alkaline earth metal salt.Preferred Anion: The halogen-containing anion and mineral acid anion are chosen from phosphorus hexafluoride anion (PF6-), chlorate anion (ClO4-), trifluoromethanesulfonate anion (CF3SO3-), C4F9SO3-, boron fluoride anion (BF4-), (CF3SO3)2N-, (C2F5SO3)2N-, (CF3SO2)3C-, arsenic fluoride anion (AsF6-), sulfate ion (SO42-) and nitrate ion (NO3-), preferably PF6-, ClO4-, CF3SO3-, C4F9SO3-, BF4-, (CF3SO3)2N- or (C2F5SO3)2N-. EXAMPLE - Diallyl dimethyl ammonium chloride (in g) (8.08) was dissolved in 14 mL of distilled water. A mixture containing bis(trifluoromethane sulfonate) imide lithium salt (14.36) dissolved in distilled water (20 mL), was added at room temperature. Stirring was performed for 3 hours, followed by liquid separation. The aqueous phase was extracted and washed using distilled water. The molten salt phase was dried under reduced pressure in the presence of diphosphorus pentoxide, to obtain diallyl dimethyl ammonium-bis(trifluoromethane sulfonate) imide (cationic monomer).    The cationic monomer (0.4064), recrystallized p-styrene sulfonic acid lithium salt (anionic monomer) (0.1902), N,N-dimethyl acrylamide (0.1982), ethylene glycol dimethacrylate (0.0911) and lithium hexafluorophosphate (0.1519) were mixed and stirred for 1 day. The viscous solution was degassed and benzoyl peroxide (0.006) was added and stirred. The solution was heated at 80degreesC after stirring for 40 minutes, to obtain a solid polymer electrolyte. The electrolyte had excellent electroconductivity, moldability, flexibility, mechanical strength and ageing stability.