Patent ID: 8808913

Claim:
A composite positive electrode active material comprising: 80 to 98 parts by weight of a positive electrode active material expressed by the following Chemical Formula 1; 1 to 15 parts by weight of activated carbon; and 1 to 5 parts by weight of carbon black, based on 100 parts by weight of the composite positive electrode active material, wherein a specific surface area of the activated carbon is in a range of 800 m 2 /g to 3000 m 2 /g and a specific surface area of the carbon black is in a range of 1000 m 2 /g to 2000 m 2 /g: x Li 2 MnO 3 -(1− x )LiMO 2 [Chemical Formula 1] where M is one or more selected from the group consisting of magnesium (Mg), nickel (Ni), cobalt (Co), chromium (Cr), aluminum (Al), vanadium (V), iron (Fe), copper (Cu), zinc (Zn), titanium (Ti), strontium (Sr), manganese (Mn), boron (B), and lanthanum (La), and 0<x<1.