Effect of TiO2-coating on the electrochemical performances of LiCo1/3Ni1/3Mn1/3O2

A novel method to improve the cycling performance of LiCo1/3Ni1/3Mn1/3O2 in lithium-ion batteries by TiO2-coating with all ill Situ dipping and hydrolyzing method was presented in this Work. The microstructure of the TiO2-coated LiCo1/3Ni1/3Mn1/3O2 was characterized by XRD, SEM and TEM, and their electrochemical performances were evaluated by EIS and galvonostatic charge-discharge test. SEM and TEM images show that the TiO2 are pasted on the surface of the LiCo1/3Ni1/3Mn1/3O2 with nano-size. The XRD patterns indicate that the crystal structure of the TiO2-coated LiCo1/3Ni1/3Mn1/3O2 shows no obvious change compares with the bare material. The TiO2-coated LiCo1/3Ni1/3Mn1/3O2 possesses improved cycle performance and rate capability. The capacity retention of 1.0 wt.% TiO2-coated material is more than 99.0% after 12 cycles at 3.0C while that of the bare sample is only 86.6%. The capacity of coated material at 5.0C remains 66.0% of the capacity at 0.2C, while that of the bare LiCo1/3Ni1/3Mn1/3O2 is only 31.5%. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved,