abstract |
The separator according to the present invention is mainly composed of inorganic particles and a binder resin, and can be used as a free standing type separator that does not include a separator substrate such as a polymer resin film, and has an effect that no heat shrinkage problem occurs. In addition, the separator of the present invention improves the crystallinity of the binder resin by stretching, thereby increasing the tensile strength, and has a low dimensional change rate due to impregnation of the electrolyte solution. |