SEPARATOR AND SECONDARY BATTERY INCLUDING THE SAME

The present invention relates to a separator and a secondary battery including same, the separator comprising a porous substrate and a conductive layer arranged on the porous substrate, wherein the conductive layer comprises a carbon nanotube structure in which a plurality of single-walled carbon nanotube units are coupled to each other side by side, and the carbon nanotube structure has an average particle diameter of 2-500 nm.