Composite positive electrode active material for lithium secondary battery and lithium secondary battery comprising electrode including the composite positive electrode active material

A composite positive electrode active material for a lithium secondary battery comprising a compound represented by Formula 1 below and a compound represented by Formula 2 below:

• LiaNixCoyMnzM1-x-y-zO2 Formula 1
• wherein, in Formula 1, M is selected from boron (B), magnesium (Mg), aluminum (Al), chrome (Cr), vanadium (V), titanium (Ti), iron (Fe), zirconium (Zr), zinc (Zn), silicon (Si), yttrium (Y), niobium (Nb), gallium (Ga), tin (Sn), molybdenum (Mo), and tungsten (W), and
• a, x, y, and z satisfy the equations of 1.0≤a≤1.2, 0.0≤x<1.0, 0.1<y≤1.0, 0.0≤z≤1.0, and 0.0≤1-x-y-z≤0.3,
• M1z[M2(CN)6]x.nH2O Formula 2
• wherein, in Formula 2, M1 and M2 are each independently at least one selected from iron (Fe), vanadium (V), manganese (Mn), cobalt (Co), nickel (Ni), and copper (Cu),
• z is in the range of about 2 to about 4,
• x is in the range of about 1 to about 5,
• n is 0 or in the range of about 1 to about 10, and
• the amount of the compound of Formula 2 is in a range of about 0.01 mol % to about 5 mol % based on the total amount of the composite positive electrode active material;
• wherein the composite positive electrode active material comprises particles of the compound of Formula 1, each particle being coated only with a non-continuous coating layer consisting of precipitates of the compound of Formula 2.