BINDER COMPOSITION, SEPARATOR INCLUDING BINDER FORMED FROM THE BINDER COMPOSITION, LITHIUM BATTERY INCLUDING THE SEPARATOR, AND METHOD OF PREPARING THE BINDER COMPOSITION

摘要

A separator for a battery, a battery, and a method of preparing a graft copolymer for a binder, the separator including a porous substrate; a coating layer on at least one surface of the porous substrate, the coating layer including an inorganic oxide; and a binder between the porous substrate and the inorganic oxide or between adjacent particles of the inorganic oxide, the binder including a graft copolymer, wherein the graft copolymer has a backbone of a polyvinylidene fluoride-based polymer or a polyvinylidene fluoride-based copolymer, and a pendant chain grafted to the backbone, the pendant chain including a hydrophilic repeating unit, and fluorine atoms in the backbone of the graft copolymer are partially substituted with at least one of chlorine, bromine, or iodine.

主权项

1. A separator for a battery, the separator comprising:
a porous substrate; a coating layer on at least one surface of the porous substrate, the coating layer including an inorganic oxide; and a binder between the porous substrate and the inorganic oxide or between adjacent particles of the inorganic oxide, the binder including a graft copolymer, wherein: the graft copolymer has:
a backbone of a polyvinylidene fluoride-based polymer or a polyvinylidene fluoride-based copolymer, anda pendant chain grafted to the backbone, the pendant chain including a hydrophilic repeating unit, and fluorine atoms in the backbone of the graft copolymer are partially substituted with at least one of chlorine, bromine, or iodine.