Conductive carbon has been coated on the surface of LiNi0.5Mn1.5O4 cathode material by the carbonization of sucrose for the purpose of improving the rate performance. The effect of carbon coating on the physical and electrochemical properties is discussed through the characterizations of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), cycling and rate tests. Results demonstrate that the carbon coating can greatly enhance the discharge capacity, rate capability and cycling stability of the LiNi0.5Mn1.5O4 without degrading the spinel structure. The sample modified with 1wt.% sucrose displays the best performance. A large capacity of 130mAhg−1 at 1C discharge rate with a high retention of 92% after 100 cycles and a stable 114mAhg−1 at 5C discharge rate can be delivered. The remarkably improved rate properties of the carbon-coated samples are due to the suppression of the solid electrolyte interfacial (SEI) layer development and faster kinetics of both the Li+ diffusion and the charge transfer reaction.