Cathode including insulation layer on cathode tab and secondary battery including the cathode

A cathode comprising:

• a cathode current collector;
• a cathode tab protruding from the cathode current collector;
• an insulation layer made of an insulating material and coated on the cathode tab, wherein the insulating material comprises any one selected from the group consisting of butyl acrylate, styrene, acrylic acid, hydroxyethyl acrylate, and a styrene-butadiene rubber (SBR), or a mixture of two or more thereof;
• and
• a cathode active material layer, wherein the cathode active material layer is present on the cathode current collector and is present on a portion of the cathode tab,
• wherein the cathode active material layer that is present on a portion of the cathode tab comprises an inclined portion extending from a width of the cathode active material down to the current collector in which a thickness thereof is decreased along a protruding direction of the cathode tab,
• wherein a width of the cathode tab in a direction perpendicular to the protruding direction is less than a width of the cathode current collector in the direction perpendicular to the protruding direction, and
• wherein the insulation layer is coated in an amount of 10% to 90% of a total length of the cathode tab in the protruding direction of the cathode tab from ½ of an inclined length of the inclined portion and has a thickness of 50% to 100% of a thickness of the cathode active material coating portion on the cathode tab.