FUNCTIONAL SEPARATOR, MANUFACTURING METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

In order to solve the problem caused by leaching of lithium polysulfide, the present invention discloses a functional separator, a method of manufacturing the same, and a lithium secondary battery comprising the same, which can improve the capacity and life of the battery by coating a material capable of reducing lithium polysulfide on the separator surface. The functional separator comprises a base separator; and a redox active polymer-conductive carbon composite layer located on the surface of the base separator.