Preparation and characterization of Li[Ni(x)M(y)Mn(1-x-y)]O2 (x = 0.3, y = 0.2) (M = Mg, in, Gd) as positive electrodes for lithium rechargeable batteries.

Mn-rich layered Li[Ni0.3M0.2Mn0.5]O2 (M = Mg, In, and Gd) cathode active materials were synthesized by a simple sol-gel method and comparative studies of those materials depending on doping elements were carried out.