Cathode active material for lithium rechargeable battery, manufacturing method thereof and lithium rechargeable battery

A cathode active material for a lithium rechargeable battery comprising a lithium transition metal composite oxide containing Mg or Al atoms,

• the lithium transition metal composite oxide is obtained from a mixture of a lithium compound, a transition metal compound and a metal compound,
• the metal compound containing Mg or Al atoms,
• the metal compound is obtained from a first metal compound and a second metal compound,
• wherein the first metal compound is selected from a halide, a phosphate, a hydrogen phosphate, and a sulfate of Mg or Al, and
• the second metal compound is selected from an oxide, a hydroxide, and a carbonate of Mg or Al,
• wherein Mg or Al atoms are contained in a lithium transition metal oxide, said lithium transition metal oxide being represented by one of the general formulas (1) to (4):
• LixCO1-yMeyO2, wherein Me is a transition metal element selected from Ga, and Zn, x being a number in a range of 0.9≦x≦1.2, and y being a number in a range of 0≦y≦0.05;
• (1)
• LiFePO4;
• (2)
• LiNi0.5Mn1.5O4;
• and (3)
• LiMn2O4, (4)
• and wherein the obtained lithium transition metal composite oxide containing Mg or Al atoms contains a metal oxide of MgO or Al2O3 present on or near the surface of a particle and Mg atoms or Al atoms forming a solid solution with the lithium transition metal composite oxide present inside the particle.