TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal cation is lithium ion, sodium ion or potassium ion. The anode of the battery comprises lithium iron phosphate, manganese lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium chromium oxide and/or lithium sulfur oxide. The cathode of the battery comprises carbon micro-sphere and graphite, lithium metal, lithium alloy and lithium-titanium oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The polymeric borate lithium salt is of formula (I), preferably 11 boron-containing polymeric lithium salt compounds e.g. of formula (Ia). The non-proton organic solvent is ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, tetrahydrofuran, 2-methyl tetrahydrofuran, methyl formate, ethyl formate, dimethyl ether, triethylene glycol dimethyl ether, tetraethyleneglycol dimethylether, ( gamma )-butyrolactone, dimethyl sulfoxide, sulfolane, dimethyl sulfone, N,N-dimethyl formamide, acetonitrile, dimethyl sulfite and/or sulfurous acid diethyl ester. The ionic liquid is 1-methyl-3-ethyl imidazole tetrafluoroborate, 1-methyl-3-ethyl-imidazole hexafluorophosphate and hexyltrimethyl ammonium bis(trifluoromethanesulfonylimide)    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The high molecular polymer comprises polyvinylidene fluoride, poly(vinylidene fluoride-hexafluoropropylene) copolymer, polyacrylonitrile, polymethyl methacrylate, polyethylene oxide, polyvinyl butyral and/or polychlorotrifluoroethylene.X1-X4=-CH2-, -CH2-CH2-, -CH(R)-CH2-, -CH2-CH(R)-, -CH(O-R)-CH2-, -CH2-CH(O-R)-, -C(=O)- or -CH2-C(=O)-;R=1-5C alkyl or 1-5C fluoroalkyl;Y1=straight chain or branched alkyl group, straight-chain or branched fluoroalkyl, aryl or fluoroaryl;andL1=-(CH2)m-, -(CH2CH2O)m-, -(CH2CH(CH3)O)m- or -(C6H4)m-.Preferred Composition: The content of the polymeric borate lithium salt is 10-80 mass% and the high-molecular polymer is 10-90 mass%.