LITHIUM SECONDARY BATTERY USING MULTI-COMPONENT SEPARATOR FILM WITH SURFACTANT

摘要

PURPOSE: A secondary lithium battery including a multi-component separator film is provided to increase a battery capacity, to improve rate property and cycle property by remarkably improving the wettability of an electrolyte to an electrode, and to remarkably shortening a manufacturing time of the battery. CONSTITUTION: A secondary lithium battery having a multi-component separator film including a surfactant is a battery in which an anode containing a lithium transition metal compound and a cathode containing carbon are combined with the separator film. The separator film includes polyolefin, a vinylidene fluoride-based polymer, and the surfactant. A method for manufacturing the separator film comprises the following steps: mixing the vinylidene fluoride-based polymer and the surfactant with the polyolefin using a compatibilizerl and extruding and casting the mixture with liquid paraffin into a shape of polyolefin-vinylidene fluoride-based polymer-surfactant.