TECHNOLOGY FOCUS - ELECTRONICS - Preferred Battery: The battery comprises cathode containing carbon material capable of occlude-discharging lithium, its alloy or ion, inorganic oxide capable of occlude-discharging lithium, inorganic chalcogenide capable of occlude-discharging lithium or conductive high molecular compound capable of occlude-discharging lithium.Preferred Process: Alternately, the polymerizable composition is arranged on a support and polymerized. Subsequently, the electrolyte salt is impregnated by contacting the obtained polymer with an electrolyte liquid.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Salt: The electrolyte salt is chosen from alkali metal salt, quaternary ammonium salt and quaternary phosphonium salt.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvent: The polymer electrolyte contains an organic solvent chosen from carbonate type compound, and inorganic oxide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The high molecular compound is obtained by reacting heat and/or actinic light polymerizable compound, compound having functional group reactive with the polymerizable compound, and poly or oligo carbonate group. EXAMPLE - Carbonate compound (in g) (60) having mean molecular weight of 1200 and methacryloyl oxy ethyl isocyanate (15.5) were dissolved in tetrahydrofuran (200 ml). Subsequently, dibutyl tin dilaurate (0.44) was added and the contents were reacted at 25 degrees C for 15 hours to obtain a polymerizable compound as a colorless product. The obtained polymerizable compound (2), ethylene carbonate (1.8), ethyl methyl carbonate (4.2), lithium hexafluoro phosphate (0.6) and 2,4,6-trimethyl benzoyl diphenyl phosphine oxide were mixed in argon atmosphere to obtain a photopolymerizable composition. The obtained composition was applied on polyethylene terephthalate film and irradiated with fluorescent lamp for 10 minutes. A polymer film impregnated with ethylene carbonate and ethyl methyl carbonate was obtained. The obtained solid polymer electrolyte film had ionic conductivity of 0.8x10-3 S/cm.