CATHODE, MANUFACTURING METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING CATHODE

The present invention relates to a cathode, wherein the cathode comprises a cathode active material layer including a cathode active material, and the crack rate, of the surface part of the cathode active material layer, derived from the following mathematical formula 1 is 5.0-14.2%. [Mathematical formula 1] CR = (CA) / [(PA) + (CA)] In the formula, CR is crack rate (%), CA is crack area, PA is particle area, and the surface part of the cathode active material layer means the area from the layer surface down to a depth of 20 μm. La présente invention concerne une cathode, la cathode comprenant une couche de matériau actif de cathode comprenant un matériau actif de cathode, et le taux de fissure, de la partie de surface de la couche de matériau actif de cathode, dérivé de la formule mathématique 1 suivante est de 5,0 à 14,2 %. [Formule mathématique 1] CR = (CA)/ [(PA) + (CA)] dans la formule, CR est le taux de fissure (%), CA est la surface de fissure, PA est la surface de particule, et la partie de surface de la couche de matériau actif de cathode signifie la zone à partir de la surface de couche jusqu'à une profondeur de 20 µm. 본 발명은 양극에 관한 것으로, 상기 양극은 양극 활물질을 포함하는 양극 활물질층;을 포함하며, 하기 수학식 1로부터 도출되는 상기 양극 활물질층 표면부의 크랙율은 5.0% 내지 14.2%인 것이다. [수학식 1] CR = (CA) / [(PA) + (CA)] 여기서, CR은 크랙율(%)이고, CA는 크랙 영역이며, PA는 입자 영역이고, 상기 양극 활물질층 표면부는 층 표면으로부터 깊이 방향으로 20 ㎛ 까지의 영역을 의미한다.