TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The polyethylene glycol derivative comprises polyethylene glycol monomethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol monoacrylate or polyethylene glycol diacrylate.Preferred Composition: The gel electrolyte comprises (parts by weight based on 100 parts by weight of the composition): polysiloxane compound or the polysiloxane-polyoxyalkylene (0.1-10), polyethylene glycol derivative (0.4-50), organic solvent containing lithium salt (50-97), ethoxylated trimethylolpropane triacrylate (greater than 0-5) and polymerization initiator(s) (0.1-5).Preferred Method: Curing is performed by thermal polymerization, electron beam polymerization or ultraviolet polymerization.Preferred Condition: The thermal polymerization is performed at 60-100 degreesC.Preferred Material: The separator is formed of a polyethylene sheet and/or a polypropylene sheet.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The polymerization initiator comprises benzophenone, benzoyl peroxide, acetyl peroxide, lauroyl peroxide or azobisisobutyronitrile. The lithium salt comprises lithium trifluoromethane sulfonate or lithium bistrifluoromethanesulfonyl amide. The organic solvent comprises propylene carbonate, ethylene carbonate, dimethyl carbonate, methylethyl carbonate, diethyl carbonate, vinylene carbonate, triglyme, tetraglyme or gamma-butyrolactone.Preferred Composition: The organic solvent comprises lithium salt in amount 4-15, preferably 0.5-3, moles based on 1 liter of the organic solvent).    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The lithium salt can also comprise lithium perchlorate, lithium tetrafluoroborate, lithium hexafluorophosphate (LiPF6) or lithium hexafluoroarsenate.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The electrode assembly is a winding type. The case is a pouch. EXAMPLE - A polysiloxane of formula (I) (0.2 g), polyethylene glycol dimethacrylate (1.8 g), polyethylene glycol monomethacrylate (0.5 g), ethoxylated trimethylolpropane triacrylate (0.5 g), azobisisobutyronitrile (0.1 g) and a solution containing LiPF6 (30 g) and EC/DMC/DEC in a mixture ratio of 3:3:1 were mixed to prepare a gel electrolyte composition. The composition (3 g) was injected into the pouch battery, hermetically sealed and allowed to stand in an oven at 80 degreesC for 4 hours.    R1-O-(CH2)m-(Si(R2R3)-O)n-Si(R2R3)-(CH2)n-O-R4 (I)    m and n = 3;    R1, R2, R3 = methyl;    R4 = CH2=C(CH3)-C(=O).