Annealing effects of TiO_2 coating on cycling performance of Ni-rich cathode material LiN_(0.8)Co_(0.1)Mn_(0.1)O_2 for lithium-ion battery

摘要

Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode particles were coated with anatase TiO2 layer to improve its cycle stability. The TiO2 coating was synthesized by the hydrolyzation method and subsequent annealing treatment ranging from 500 t to 600 degrees C. The well-ordered layered alpha-NaFeO2-type structure survives in the TiO2 coating process. The nanothick anatase TiO2 layer coveres on the surface of NCM811. The annealing temperature of coating was controlled to improve the electrochemical performances. The TiO2-coated NCM811 cathode annealed at 600 t demonstrates the optimal capacity retention of 104.9% after 100 cycles at the current rate of 0.1 C, in contrast to 64.1% of pristine NCM811 and 96.7% of the coated sample annealed at 500 degrees C. (C) 2020 Elsevier B.V. All rights reserved.