极性基改性的梳形聚醚固体电解质

在作为双离子导体基质的梳形聚醚链结构中引入适量的极性基团,可显著改善其锂盐复合物的离子导电性。含不同极性基的共聚单体提高其电导率的效果为:MAn>AN>AM>ECH。在单离子导体中,极性基不仅抑制结晶和促进盐的离解,而且能增大体系的相容性,从而使电导率提高约一个数量级。大分子链间的相互作用因极性增强而增大,使梳形聚醚从脆弱的蜡状固体转变为弹性体。

SOLID ELECTROLYTES OF COMB-POLYETHERS MODIFIED WITH POLAR GROUPS

Through copolymerization, various polar groups were introduced onto the main chain of comb-polyethers and improve bi-ion conduction property of their lithium salt complexes obviously in the following order :MAn>AN>AM>ECH. In single-ion conductors .polar groups not only retard oligoether-crystallization and promote salt-dissociation in polymer media as they do in bi-ion.conductors, but also enhance the homogeneity of the matrix, thus cationic conductivity is improved in the pavorable morphology by an order of magnitude, the existence of polar groups also intensified the interaction between macromolecular chains and result in rise of 7, as well as im provement of mechanical property. As a consequence, the comb-polyether materials change from the original wax-like solid or viscous flow into the current elastomer .which keeps a shear modu lus between 2000 and 300mN/mm2 in a wide temperature range.