CeO 2 coating to improve the performance of Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2

The Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 coated with CeO 2 has been fabricated by an ionic interfusion method. Both the bare and the CeO 2 -coated samples have a typical layered structure with R-3m and C2/m space group. The results of XRD and TEM images display that the CeO 2 coating layer on the precursor could enhance the growth of electrochemically active surface planes ((010), (110), and (100) planes) in the following ionic interfusion process. The results of galvanostatic cycling tests demonstrate that the CeO 2 -coated sample has a discharge capacity of 261.81 mAh g −1 with an increased initial Coulombic efficiency from 62.4 to 69.1% at 0.05 °C compared with that of bare sample and delivers an improved capacity retention from 71.7 to 83.4% after 100 cycles at 1 °C (1 °C = 250 mA g −1 ). The results of electrochemical performances confirm that the surface modification sample exhibits less capacity fading, lower voltage decay, and less polarization.