Patent ID: 8663846
Filing Date: 2014-03-04
Classification: B82Y,H01M,Y02E

Abstract:
1. A composite cathode active material comprising: at least one large diameter active material selected from the group consisting of compounds represented by Formula 1 and compounds represented by Formula 2; and at least one small diameter active material selected from the group consisting of compounds represented by Formula 2, compounds represented by Formula 3, and compounds represented by Formula 4; wherein a ratio of an average particle diameter of the large diameter active material to an average particle diameter of the small diameter active material ranges from about 6:1 to about 100:1, and wherein a pressed density of the composite cathode active material is about 3.2 to about 4.0 g/cm wherein 0.90≦x≦1.1, 0.8≦y≦0.9, 0≦z≦0.5, 0≦α≦2, M is selected from the group consisting of Al, Ni, Mn, Cr, Fe, Mg, Sr, V, rare earth elements and mixtures thereof, and X is selected from the group consisting of O, F, S and P, wherein one of the at least one large diameter active materials is different from at least one of the at least one small diameter materials, and wherein a weight ratio of the at least one large diameter active material to the at least one small diameter active material ranges from about 70:30 to about 80:20.