Patent ID: 8394534

Claim:
A positive electrode active composition for a lithium ion battery comprising a layered lithium metal oxide composition approximately represented by the formula xLi 2 MnO 3 .(1−x)LiNi u+Δ Mn u−Δ Co w A y O 2 , x is at least about 0.03 and no more than about 0.21, wherein the absolute value of Δ is no more than about 0.3, 2u+w+y is approximately equal to 1, w is in the range from 0 to 1, u is in the range from 0.225 to 0.5 and y is no more than about 0.1, with the proviso that both (u+Δ) and w are not zero, wherein an optional fluorine dopant can replace no more than about 10 mole percent of the oxygen and a stabilization coating, wherein the composition exhibits an irreversible capacity loss of no more than about 45 mAh/g with charging to 4.6V and discharging to 2V.