低分子增塑聚环氧乙烷固体电解质研究

THE STUDY OF PLASTICIZATION FOR POLY (ETHYLENE OXIDE) SOLID ELECTROLYTES WITH LOW MOLECULES

采用低分子量聚乙二醇(PEG)和碳酸丙烯酯(PC)作增塑剂,对聚环氧乙烷复合物(PEO-LiClO_4)高分子固体电解质进行了研究,以改善固体电解质的离子导电性。用交流阻抗法、透射电镜、X-射线衍射和差示扫描量热等手段,对固体电解质膜的结构和性能进行了分析。实验表明,增塑使聚醚的结晶度下降,导电率提高。采用18.9%-31.9%(mol)的PEG(分子量为200～400)并配17.6%～26.0%(mol)的PC增塑效果最好,得到室温电导率为10^(-2)Ω^(-1)m^(-1)的聚环氧乙烷固体电解质膜。组装成全固态锂电池性能良好。

The plasticization of solid polymer electrolytes have been investigated with low molecular poly(ethylene glycol) and propylene carbonate against poly(ethylene oxide) complexes (PEO-LiClO_4), The aim of this work is to improve the conductivity. The complex impedence, TEM, x-ray diffraction and DSC are used to study the structures and properties. The information obtained indicates that the addition of plasticizers makes the amorphous phase and conductivity increase. The complexes, to which are added 18.9% to 31.9% (mol) PEG (mol.wt.200～400) and 17.6% to 28.8% (mol) PC, exhibit good conductivity (10^(-2)Ω^(-1)m^(-1)) at room temperature. The solid polymer electrolytes are used in all solid state lithium batteries and show promising features.