A series of electrochemical spinel compounds, LiCr x Ni0.5−x Mn1.5O4 (x=0, 0.1, 0.3), are synthesized by a sol–gel method and their electrochemical properties are characterized in the voltage range of 3.5–5.2V. Electrochemical data for LiCr x Ni0.5−x Mn1.5O4 electrodes show two reversible plateaus at 4.9 and 4.7V. The 4.9V plateau is related to the oxidation of chromium while the 4.7V plateau is ascribed to the oxidation of nickel. The LiCr0.1Ni0.4Mn1.5O4 electrode delivers a high initial capacity of 152mAhg−1 with excellent cycleability. The excellent capacity retention of the LiCr0.1Ni0.4Mn1.5O4 electrode is largely attributed to structural stabilization which results from co-doping (chromium and nickel) and increased theoretical capacity due to substitution of chromium.