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以十六烷基聚乙二醇甲基丙烯酸酯(HPEGM)和甲氧基聚乙二醇甲基丙烯酸酯(MPEGM)为单体,离子液体1-丁基-3-甲基咪唑(BmimBF4)为增塑剂,高氯酸锂(LiClO4)作锂盐,采用自由基溶液聚合法制备凝胶聚合物电解质(PGE)。用红外光谱(FT-IR)、差热分析(DSC)和交流阻抗(AC)等方法对聚合物电解质的结构与性能进行了研究。测试结果表明:离子液体对聚合物基体起到了很好的增塑作用,促进了聚氧化乙烯(PEO)链段的运动,有利于离子传输;当m(HPEGM)∶m(MPEGM)∶m(BmimBF4)=1∶4∶10,n(Li+)∶n(EO)=1∶20时,30℃下,聚合物电解质的离子电导率可达1.10×10-3 S/cm;聚合物电解质膜显示出优良的热稳定性;电化学窗口达4.6V。
Using cetyl polyethylene glycol methacrylate (HPEGM) and methoxypolyethylene glycol methacrylate (MPEGM) as monomers, the ionic liquid 1-butyl-3-methylimidazole (BmimBF4) As a plasticizer, lithium perchlorate (LiClO4) as a lithium salt, the use of free radical polymerization solution prepared gel polymer electrolyte (PGE). The structure and properties of polymer electrolytes were studied by FT-IR, DSC and AC. The results showed that the ionic liquid played a good plasticizing effect on the polymer matrix and promoted the movement of poly (ethylene oxide) (PEO) segment, which was in favor of ion transport. When m (HPEGM): m (MPEGM): m Ionic conductivity of the polymer electrolyte can reach 1.10 × 10 -3 S / cm at 30 ° C with a molar ratio of BmimBF 4 = 1: 4:10 and n (Li +): n (EO) = 1:20; the polymer electrolyte membrane Show excellent thermal stability; electrochemical window up to 4.6V.