Performance of LiM0.05Co0.95O2 Cathode Materials in Lithium Rechargeable Cells When Cycled up to 4.5 V

Lithium cobalt oxides doped with metal ions of the type LiM0.05C0.95O2 (M = Sn, Cr, Bi, and Zr) have been synthesized using a solid-state technique, and X-ray diffraction and SEM patterns have been evaluated. High stable capacities of ∼155 mAh/g at C/5 were obtained with Zr-doped LiCoO2 when cycled up to 4.5 V and have not been reported previously.