Alleviating the surface degradation of Ni-rich cathode materials is desirable to achieve better electrochemical performance. Herein, we report the surface coating of lithium diborate (Li2O-2B2O3) over the Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material and the systematic investigation of its electrochemical properties. The structural and morphological properties were characterized through X-ray diffraction (XRD), high resolution field-emission scanning electron microscopy (HR FE-SEM), and high resolution field-emission transmission electron microscopy (HR FE-TEM). As a cathode material for Li-ion batteries, the 1.0 wt% Li2O-2B2O3 coated NCM811 exhibits better electrochemical properties than the bare NCM811 as well as 0.5 and 2wt% coated electrodes at room and elevated temperatures (60 °C ). The improved electrochemical performance of 1.0 wt% Li2O-2B2O3 coated NCM811 might be due to the optimal coating amount that promotes better ion and electron movement along with prevention of surface degradation.