Cathode material of lithium cobalt oxide for a lithium ion secondary battery and preparation methods and applications thereof

A cathode material composition for a lithium ion secondary battery, which is characterized by comprising a cathode material of lithium cobalt oxide in a weight fraction of 40% to 100%,

• wherein the cathode material comprises a core material and a coating layer,
• wherein the core material is LixCo(1-y)AyO(2+z), wherein 1.0≤x≤1.11, 0≤y≤0.02, −0.2<z<0.2, and A is one or two or more selected from the group consisting of Al, Mg, Y, Zr and Ti,
• wherein the coating layer is LiaMbBcOd, wherein M is a lithium ion active metal element, which is one or two or more selected from the group consisting of Co, Ni, Mn and Mo;
• and B is an inactive element, which is one or two or more selected from the group consisting of Al, Mg, Ti, Zr, and Y, and 0.95<b+c<2.5, and the molar ratio of Li to the active metal element M is 0.1≤a/b<1, 0.3<b<2, and 1.8<d<4.2.

A positive electrode of a lithium ion battery prepared by a raw material containing a cathode material of lithium cobalt oxide as a cathode active material,

• wherein the cathode material comprises a core material and a coating layer,
• wherein the core material is LixCo(1-y)AyO(2+z), wherein 1.0≤x≤1.11, 0≤y≤0.02, −0.2<z<0.2, and A is one or two or more selected from the group consisting of Al, Mg, Y, Zr and Ti,
• wherein the coating layer is LiaMbBcOd, wherein M is a lithium ion active metal element, which is one or two or more selected from the group consisting of Co, Ni, Mn and Mo;
• and B is an inactive element, which is one or two or more selected from the group consisting of Al, Mg, Ti, Zr, and Y, and 0.95<b+c<2.5, and the molar ratio of Li to the active metal element M is 0.1≤a/b<1, 0.3<b<2, and 1.8<d<4.2.