Patent ID: 6878490

Claim:
A positive electrode active material for secondary lithium and lithium-ion batteries comprising: at least one electron conducting compound existing in a first single phase having the formula LiM 1 x−y {A} y O z wherein M 1 is a transition metal; {A} is represented by the formula Σw i B i wherein B i is an element other than M 1 used to replace the transition metal M 1 and w i is the fractional amount of element B i in the total dopant combination such that Σw i =1; B i is a cation in LiM 1 x−y {A} y O z ; 0.95≦x≦1.05; 0≦y≦x/2; and 1.90≦z≦2.10; and at least one electron insulating and lithium ion conducting lithium metal oxide Li 2 M 2 O 3 existing in a second single phase structurally separate from the first single phase of the compound having the formula LiM 1 x−y {A} y O z , wherein M 2 is at least one tetravalent metal selected from the group consisting of Ti, Zr, and Hf.