Patent ID: 7608362

Claim:
A composite cathode active material comprising: at least one large diameter active material selected from the group consisting of LiNi 0.8 Co 0.1 Mn 0.1 O 2 , LiNiO 2 , LiNi 0.9 Co 0.1 O 2 , LiNi 0.8 Co 0.1 Al 0.1 O 2 and mixtures thereof; and at least one small diameter active material comprising a carbon-based material selected from the group consisting of graphite, hard carbon, carbon black, carbon fiber, carbon nanotubes (CNT) and mixtures thereof, 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.