Patent ID: 7547492

Claim:
Lithium cobalt oxide comprising: a mixture of lithium cobalt oxide particles (A) and lithium cobalt oxide particles (B); wherein the lithium cobalt oxide particles (A) are composed of uniformly monodisperse particles, which refers to particles present independently of each other, and the lithium cobalt oxide particles (A) have an average particle diameter in a range of 5 to 30 μm; the lithium cobalt oxide particles (B) are composed of an aggregation of primary particles forming a secondary particle, and the secondary particles have an average particle diameter in a range of 0.1 to 10 μm; and wherein a tap density of the mixture of the lithium cobalt oxide particles (A) and the lithium cobalt oxide particles (B) is at least 1.7 g/cm 3 , and a pressed density of the mixture of the lithium cobalt oxide particles (A) and the lithium cobalt oxide particles (B) is 3.5 to 4.0 g/cm 3 .