TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The alkoxyalkyl group-containing amide compound (I) or (II) is chosen from N-methoxyethyl methylcarbamate, N-methoxyethyl-N-methyl methylcarbamate, N-methoxymethyl-N-methyl methylcarbamate, N-methyl-N-methoxyethyl carbamate, N-methyl-N-methoxyethyl methoxymethyl carbamate, N-methoxyethyl caprolactam and N-methoxyethyl oxazolidone. The borane compound is chosen from trimethoxyborane, tris(trifluoroethoxy)borane, tris(heptafluorobutoxy)borane and triphenoxyborane. Preferred Composition: The molar ratio of alkoxyalkyl group-containing amide compound and lithium salt is 1-8:1. The carbonate-type compound is chosen from linear carbonate and cyclic carbonate, preferably polypropylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, butylene carbonate, methylpropyl carbonate, ethylpropyl carbonate, dimethylsulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methylpyrrolidone, ethylmethyl carbonate and/or ( gamma )-butyrolactone. The monomer is vinyl monomer chosen from acetonitrile, methyl methacrylate, methyl acrylate, methyl acrylonitrile, methyl styrene, vinyl ester, vinyl chloride, vinylidene chloride, acrylamide, tetrafluoroethylene, vinyl acetate, methyl vinyl ketone, ethylene and styrene. The anion of lithium salt is chosen from fluoride ion, chloride ion, bromide ion, iodide ion, nitrate ion, tetrafluoroborate ion, perchlorate ion, hexafluorophosphate ion, thiocyanate ion, pentafluoroethyl sulfonyl imide ion, methyl carbonate ion, trifluoromethyl carbonate ion, trifluoromethylsulfonyl carbide ion, hexatrifluoromethyl phosphide ion, trifluoromethyl sulfonate ion, pentafluoroethyl sulfonate ion and bis(trifluorosulfonyl)imide ion.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The electrolyte is polymer electrolyte obtained by polymerizing precursor solution containing monomer, and further contains carbonate-type compound (5-200 parts weight). The polymer electrolyte is further dipped into a polymer chosen from polymethylmethacrylate, polyvinylidene difluoride, polyvinyl chloride, polyethylene oxide and polyhydroxyethyl methacrylate.