SEPARATOR FILM COATING MATERIAL FOR SECONDARY BATTERY AND MANUFACTURING METHOD OF SEPARATOR FILM USING THIS AND SEPARATOR FILM THEREFROM AND SECONDARY BATTERY USING THE SAME

摘要

PURPOSE: A separator film coating material for a secondary battery, a manufacturing method of a separator film using thereof, the separator film, and the secondary battery are provided to improve the thermal property and safety of the separator film and to extend the lifetime of the battery. CONSTITUTION: A manufacturing method of a separator film coating material for a secondary battery comprises the following steps: dissolving 0.01~0.04wt% of polyvinylidene fluoride-hexafluoropropylene copolymer into 1~1.2wt% of acetone solvent(S100); adding 0.01~0.05wt% of ethanol(S104); adding 0.01~0.1wt% of nano inorganic particles and obtaining a liquid polymer composite by stirring the previous mixture(S106). A separation film of the secondary battery is manufactured by spraying the separator film coating material on a separator substrate including a micro porous structure and heating the material to evaporate the acetone solvent and ethanol.