LiNi0.5Mn0.5-xTixO2 series was prepared by a simple solid state method using MnO2, TiO2 and nickel carbonate basic as the starting materials. Its structural and electrochemical characteristics were also studied and compared with those prepared by the spray dry method. As Ti content increases, the degree of cation mixing increases and the structure of compound transforms gradually from a layered structure to a disordered rock salt structure. There are two plateaus in the initial charge curve for compounds with x < 0.3. One is around 4.0 V and the other is around 4.6 V. Both the initial charge and discharge capacities decrease as Ti content increases. Compounds with x < 0.3 exhibit good cyclic performance at room temperature. (C) 2004 Elsevier B.V. All rights reserved.