TECHNOLOGY FOCUS - POLYMERS - Preferred Electrolyte: The gel polymer electrolyte comprises 0.2 to 1.5 parts of electrolyte, 50 to 250 parts of organic solvent, and 0.5 to 25 parts of inorganic filling material based on 100 parts of polymer by weight. It comprises 0.3 to 1.2 parts of electrolyte, 50 to 250 parts of organic solvent, and 0.5 to 15 parts of inorganic filling material based on 100 parts of polymer by weight. The particle size of the inorganic filling material is 0.1 to 100 microns. The particle size of the inorganic filling material is 0.1 to 50 microns. The polymer is one or more of homopolymer or copolymer of the monomers of vinylidene fluoride, methyl methacrylate, acrylonitrile, butyl acrylate, methyl acrylate, butyl methacrylate, methacrylic acid phenyl methyl ester, acenaphthylene, vinyl pyridine, acrylamide, methyl vinyl ether, ethenyl ethanoate, hexafluoropropylene and vinyl pyrroline; the electrolyte is one or more of Lithium Hexafluorophosphate (LiPF6), Lithium tetrafluoroborate (LiBF4), Lithium perchlorate (LiClO4), Lithium bis(oxalato)borate (LiBOB), Lithium bis(trifluoromethanesulfonyl)imide (LiN(SO2CF3)2), lithium trifluoromethanesulfonate (LiCF3SO3), lithium bis(perfluoroethylsulfonyl)imide (LiN(SO2CF2CF3)2); the organic solvent is one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and vinylene carbonate. The polymer is one or more of homopolymer or copolymer of the monomers of acrylonitrile, methyl methacrylate, vinylidene fluoride, hexafluoropropylene and methacrylic acid phenyl methyl ester, or the mixture of the homopolymers and/or the copolymers; the electrolyte is LiPF6 and/or LiBF4; the organic solvent is the mixture of ethylene carbonate, diethyl carbonate and ethyl methyl carbonate, and the volume ratio of the diethyl carbonate to the ethyl methyl carbonate to the ethylene carbonate is 1:(1 to 2):(1.5 to 3). Preferred Battery: In the polymer battery, the content of the gel polymer electrolyte is 2.9 to 4.1 g/A.hour. Preferred Method: In preparing polymer battery, the concentration of the electrolyte is 0.2 to 1.5 parts, that of the organic solvent is 50 to 250 parts, and that of the inorganic filling material is 0.5 to 25 parts based on 100 parts of polymer by weight. The polymerizing condition is as follows: the temperature is 30 to 150 degrees C, the pressure is 0.01 to 0.5 MPa, the time is 0.5 to 20 hours. The particle size of the inorganic filling material is 0.1 to 100 microns. The polymer is one or more of vinylidene fluoride, methyl methacrylate, acrylonitrile, butyl acrylate, methyl acrylate, butyl methacrylate, methacrylic acid phenyl methyl ester, acenaphthylene, vinyl pyridine, acrylamide, methyl vinyl ether, ethenyl ethanoate, hexafluoropropylene and vinyl pyrroline; the electrolyte is one or more of LiPF6, LiBF4, LiClO4, LiBOB, LiN(SO2CF3)2, LiCF3SO3, LiN(SO2CF2CF3)2; the organic solvent is one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and vinylene carbonate. The concentration of the gel polymer electrolyte is 2.9 to 4.1g/A.hour.