TECHNOLOGY FOCUS - POLYMERS - Preferred Prepolymer: The prepolymer for epoxy resin formation is given by formula (I).n = 2-100.Preferred Composition: The molar ratio of the prepolymer and the amine in the electrolyte, is 1:1-5:1. The ratio of the total mass of prepolymer and amine to the total mass of lithium salt and organic solvent, is 1:1-1:20. Preferred Assembly: The winding type or pouch type electrode assembly is used. Preferred Separator: The separator is polyethylene or polypropylene separator. Preferred Process: Mixture of the prepolymer, amine, lithium salt and organic solvent are injected into the case. The thermal polymerization of the prepolymer and the amine is performed at 70-200degreesC to form the gel-form electrolyte.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Amine: The amine is given by formula (II). Preferred Organic Solvent: The organic solvent is propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate and/or vinylene carbonate.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Lithium Salt: The lithium salt is lithium perchlorate (LiClO4), tetrafluoro boric acid lithium (LiBF4), hexafluoro phosphoric acid lithium (LiPF6), trifluoro methane sulfonic acid lithium (LiCF3SO3) and/or lithium bis trifluoromethane sulfonyl amide (LiN2(CF3SO2)). EXAMPLE - (In grams) Polyvinylidene fluoride (15) was dissolved in 600 ml acetone. LiCoO2 (470) and super P (carbon group electroconductive agent) (15) were added and mixed for 5 hours to form a cathode active material. The obtained material was coated and dried to form a cathode electrode plate of thickness 147 mum. Polyvinylidene fluoride (50) was dissolved in 600 ml acetone. Oxalic acid (1) and carbon fiber (449), were added and mixed for 5 hours to form an anode active material. The active material was coated and dried to form an anode electrode plate of thickness 178 mum. A polyethylene separator having thickness of 18 mum and width of 5.25 cm was used as separator. The separator was provided between the cathode and the anode electrode plates and wound by jelly roll system to form an electrode assembly in the form of pouch. Prepolymer (3) (having weight average molecular weight of 2000) and amine (1) were mixed with solution of hexafluoro phosphoric acid lithium (12) comprising ethylene carbonate and propylene carbonate in volume ratio of 1:1. The obtained mixture (6) as electrolyte was injected into the pouch battery, and the battery was sealed. The sealed battery was left at 85degreesC for 2 hours. The battery had high reliability and safety.