A composition for solid polymer electrolyte which comprises a polyether polymer and an electrolyte salt compound soluble in the polyether polymer; wherein said polyether polymer is either (1) a polyether polymer having a toluene insoluble content of not larger than 5 weight %, or (2) a polyether polymer having a Mooney viscosity of 3 to 190, which has been prepared by applying a shearing force under heated conditions using an extruder to a polyether polymer having a Mooney viscosity of 10 to 200 so that the Mooney viscosity is reduced by 5 or more. This composition exhibits good film-forming property, and gives a solid polymer electrolyte exhibiting good and uniform ionic conductivity, and having high mechanical strength and surface smoothness. The solid polymer electrolyte is suitable for batteries and capacitors, especially for a lithium ion secondary battery.
一种固体聚合物电解质组合物,包括聚醚聚合物和可溶于聚醚聚合物的电解质盐化合物;其中所述聚醚聚合物是(1)
甲苯不溶物含量不大于 5 重量%的聚醚聚合物,或(2)门尼粘度为 3 至 190 的聚醚聚合物,其制备方法是使用挤压机在加热条件下对门尼粘度为 10 至 200 的聚醚聚合物施加剪切力,使门尼粘度降低 5 或更多。这种组合物具有良好的成膜性能,可制成固体聚合物电解质,离子导电性好且均匀,机械强度高,表面光滑。这种固体聚合物电解质适用于电池和电容器,尤其适用于
锂离子二次电池。