超支化聚醚复合聚合物固体电解质的研究

Study on solid polymer electrolyte made of hyperbranched polyethers

以环氧丙醇的自缩合开环聚合(SCROP)制备了超支化聚醚,引入甲基丙烯酰氧基团改性、掺杂LiClO4后制备了光固化聚合物固体电解质。以1H-NMR、13C-NMR、FTIR、DSC、GPC对超支化聚醚及改性结构进行了表征。该超支化聚醚的玻璃化温度Tg为-38·1℃,在与GMA的反应中,27·2%的聚醚羟基与GMA发生了反应。接枝GMA后,玻璃化温度Tg为-37·5℃,GPC测得的重均分子量为5820,分子量分布为1·66;发现LiClO4的用量对电导率有较大影响,当EO/Li+=6时,室温下聚醚固体电解质的离子电导率为1·6×10-5s/cm。

Hyperbranehed polyethers had been synthesized by the polymerization of glycidol and were modified to introducing methacryloxy groups at chain-ends. Solid polymer electrolytes were prepared by photocuring of composites containing the modified hyperbranched polyethers and LiClO4.1 H-NMR.13C-NMR.FTIR.DSC.GPC were used to characterized hyperbranched polyethers and its modified structures. The hyperbranched polyethers had low Tg, -38. 1℃, and in reaction with GMA, 27.2% hydroxy were reacted. The Tg of hyperbranched polyethers grafted with GMA was - 37. 5℃, with Mw =5820, Mw/M, = 1.66, as measured by GPC. It was found that the amount of LiClO4 in the composites had great effects on ion conductivity. The ion conductivity of the electrolytes was 1.6× 10^-5 s/cm at room temperature when O/Li^＋ = 6.