线性与超支化聚氨酯共聚体系固体电解质的研究

Composite Polymer Electrolytes Based on the Low Cross-Linked Copolymer of Linear and Hyperbranched Polyurethanes

用超支化和线性聚氨酯的低交联共聚物(CHPU)作为聚合物基体,LiClO4为离子源制备了一系列的聚合物固体电解质。DSC分析显示该共聚物比共混物(MHPU)玻璃化转变温度低,红外和Raman光谱显示该共聚物比共混物对盐离子的溶解性能更强,同时该体系比共混物体系有更高的电导率,25℃时CHPU30/LiClO4体系的最佳电导率达到1.5×10-5S/cm。

Low cross-linked copolymer of linear and hyperbranched polyurethane （CHPU） was prepared. The DSC curve shows that the copolymer CHPU30 has a lower Tg than the hybrid of linear and hyperbranched polyurethane MHPU30. The FT-IR spectra of the electrolytes shows that the coordination degree of carbonyl groups with Lithium ion in the copolymer is higher than in the hybrid. Raman spectra indicates that the copolymer can dissolve more lithium salt than the corresponding hybrid polymer electrolytes. The salt aggregates does not appear even at the salt concentration of EO/Li^＋ = 2. At salt concentration EO/Li= 4, the electrolyte CHPU30/LiClO4 reaches its maximum conductivity, 1.51×10^-5S/cm at 25℃. It is also shown that the conductivity keeps increasing with increasing concentration of hyperbranched polyurethane from 10% to 30%.