| 摘要 |
PURPOSE: A gel-type polymer electrolyte, a lithium battery employing the electrolyte and their preparation methods are provided, to improve the ion conductivity and the organic electrolyte solution protecting property at a room and high temperature. CONSTITUTION: The gel-type polymer electrolyte comprises 10-60 wt% of a product obtained by the cross-linking reaction of polyethylene glycol and an epoxy compound; 10-70 wt% of a softening agent polymer; 20-90 wt% of an organic electrolyte solution which comprises a lithium salt and an organic solvent and is mixed with the cross-linked product uniformly; and optionally 5-40 wt% of a ceramic filler. Preferably the softening agent polymer is at least one selected from the group consisting of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, poly(vinyl chloride), polysulfone, polymethacrylate, polyolefin, polyethylene oxide, polyurethane, poly(vinyl alcohol) and polyacrylonitrile; the organic solvent is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, tetrahydrofuran and γ-butyrolactone; the lithium salt is selected from the group consisting of LiAsF6, LiPF6, LISCN, LIClO4, LiBF4, LiCF3SO3, LiN(CF3SO2)2 and LiC(CF3SO2)3; and the ceramic filler is at least one selected from the group consisting of silica, alumina, lithium aluminate and zeolite.
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