Abstract 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 ℃ to 600 ℃. The well-ordered layered α-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 ℃ 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 ℃.

中文翻译：

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TiO2涂层退火对锂离子电池富镍正极材料LiNi0.8Co0.1Mn0.1O2循环性能的影响

摘要 富镍LiNi0.8Co0.1Mn0.1O2 (NCM811)正极颗粒包覆锐钛矿型TiO2层以提高其循环稳定性。TiO2涂层采用水解法合成，随后在500～600℃的温度范围内进行退火处理。有序的层状 α-NaFeO2 型结构在 TiO2 涂层过程中幸存下来。NCM811 表面覆盖有纳米厚锐钛矿 TiO2 层。控制涂层的退火温度以提高电化学性能。在 600 ℃ 下退火的 TiO2 涂层 NCM811 正极在 0.1 C 的电流速率下循环 100 次后的最佳容量保持率为 104.9%，而原始 NCM811 的容量保持率为 64.1%，而在 500 ℃下退火的涂层样品的容量保持率为 96.7%。