zLi(2)SiO(3)@LiNi0.5Mn0.5O2 (z = 0, 0.03, 0.05, 0.08) ("@" means "was coated on the surface of") cathode materials had been successfully prepared via a syn-lithiation strategy. The structure and the electrochemical properties were analyzed systematically. The results of the structural analysis showed that Li2SiO3 was well coated on the surface of the material, and partial of Si4+ was doped into the structure. In addition, the results of the electrochemical measurements suggest that 3 mol% Li2SiO3-coated LiNi0.5Mn0.5O2 electrode has the best electrochemical performance, including the highest capacity, best cycle stability and rate performance. The capacity retention is improved about 24% by 3 mol% Li2SiO3 coating at 60 degrees C. Additionally, all the resistances of the 3 mol% [email protected] cathode material are considerably smaller than that of the un-doped material, which means it has a faster lithium-ion migration rate. This finding is in good agreement with the calculated results. In summary, Li2SiO3 coating and Si4+ doping can lower Li/Ni mixing, increase the structural stability, reduce polarization, decrease the migration resistance and improve the migration rate of the lithium-ion which, in turn, improves the electrochemical properties of LiNi0.5Mn0.5O2. (C) 2017 The Electrochemical Society. All rights reserved.