| abstract |
A composite positive electrode active material, a preparation method thereof, a positive electrode comprising the composite positive electrode active material, and a lithium battery comprising the positive electrode, the composite positive electrode active material is represented by formula 1, wherein, in formula 1, M is zirconium (Zr), aluminum ( Al), Rhenium (Re), Vanadium (V), Chromium (Cr), Iron (Fe), Gallium (Ga), Silicon (Si), Boron (B), Ruthenium (Ru), Titanium (Ti), Niobium ( Nb), molybdenum (Mo), magnesium (Mg) or platinum (Pt), 1.1≤a≤1.3, b+c+d+e≤1, 0≤b≤0.3, 0≤c≤0.3, 0<d≤ 0.6 and 0≤e≤0.1, wherein, through the interdiffusion of lithium and metal atoms, the composite cathode active material has a uniform distribution of lithium excess regions and a uniform degree of disorder of metal cations, and the metal cations are at the atomic scale. It has a disordered and irregular arrangement on it. Formula 1 Li a Ni b Co c Mn d Me O 2 . |