Coating TiO2 on lithium-rich Li1.2Mn0.54Ni0.13Co0.13O2 material to improve its electrochemical performance

In this paper, the sol-gel method was used first to obtain the layered cathode material Li1.2Mn0.54Ni0.13Co0.13O2, and then the nanoparticles of TiO2 were coated samples in via a wet chemical process. Finally, a systematic study of the different amounts of TiO2 materials coated was carried out. XRD and SEM analysis showed that these materials after TiO2 coating have a good layered structure and regular morphology, respectively. Experiments such as XPS and TEM showed that the TiO2 nanoparticles were evenly distributed on the surface of the particles, and no substantial changes were made to each transition metal elements. Through electrochemical testing, when the TiO2 coating amount is equal to 1.0%, the first discharge-specific capacity reaches 276.5 mAh/g at 0.1 C, and the Coulomb efficiency is also as high as 80.8%. Compared with the uncoated sample, when the coating amount is 1.0%, the TiO2 coating suppresses the lack of surface oxygen and makes the structure more stable. The electrochemical performance of the material has been significantly improved.