Patent ID: 9564628
Date: 2017-02-07
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A composite cathode active material comprising at least one large-diameter active material represented by Formula 2 below: and at least one small-diameter active material represented by Formula 6 below: wherein, in Formulae 2 and 6, 1.02≦x≦1.04, 0≦y≦0.9, 0≦z≦0.5, 0≦α≦2, 0.87≦a≦0.92, 0≦b≦0.9, 0≦c≦0.5; M is at least one element selected from the group consisting of aluminum (Al), nickel (Ni), manganese (Mn), chromium (Cr), iron (Fe), magnesium (Mg), strontium (Sr), vanadium (V), and a rare-earth element; and X is an element selected from the group consisting of oxygen (O), fluorine (F), sulfur (S), and phosphorus (P), wherein the content of the transition metal is greater than the content of the lithium content in the small-diameter active material in Formula 6 and the content of the transition metal is less than the content of the lithium content in the large-diameter active material in Formula 2.