The present application claims the benefit of the European application no. 09171841.1 filed on September 30, 2009, herein incorporated by reference. The present invention relates to a positive active electrode material for lithium secondary batteries, a process for preparing the same, and lithium secondary batteries comprising the same. Non-aqueous electrolyte batteries, such as lithium secondary batteries, also named rechargeable lithium ion batteries, in which material capable of reversible intercalation of lithium ions is used as an electrode material, are known in the art. Such batteries exhibit a higher battery voltage and a higher energy density compared to aqueous type batteries such as lead batteries, nickel-cadmium batteries and nickel-hydrogen batteries. Lithium secondary batteries also have no memory effect and do not contain the poisonous metal elements mercury, lead, and cadmium. Said batteries are used in many applications, amongst which as supply electric sources for portable electronics, such as notebooks, laptops, mobile phones etc. Said batteries are also growing in popularity for defense, automotive and aerospace applications, due to their high energy density. There is thus a need for lithium secondary batteries having a high performance, especially a high energy density and a high battery voltage, but also a good thermal stability and good cycle characteristics, i.e. a good reversibility of the lithium-insertion and -deinsertion processes of positive and negative active materials. As positive active electrode materials for use in lithium secondary batteries, it is known to use, among others, mixed oxides of lithium and other metals, such as LiCo02, LiMn204, LiMn02, LiNiOa, LiNii.xCox02 (0