Annealing effects of TiO2 coating on cycling performance of Ni-rich cathode material LiNi0.8Co0.1Mn0.1O2 for lithium-ion battery

Annealing effects of TiO2 coating on cycling performance of Ni-rich cathode material LiNi0.8Co0.1Mn0.1O2 for lithium-ion battery
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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

DOI:
10.1016/j.matlet.2020.127418
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发表时间:
2020-04
期刊:
影响因子:
3
通讯作者:
Xu Yanhui
Xu Yanhui
中科院分区:
材料科学3区
文献类型:
--
作者:
Zhao Shunyu;Zhu Yutao;Qian Yucheng;Wang Nengneng;Zhao Meng;Yao Jinlei;Xu Yanhui

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在富镍LiNi0.8Co0.1Mn0.1O2(NCM811)正极颗粒上涂覆锐钛矿TiO2层以提高其循环稳定性。 TiO2涂层是通过水解法和随后的500℃至600℃退火处理合成的。有序的层状 α-NaFeO2 型结构在 TiO2 涂层过程中得以保留。纳米厚的锐钛矿型TiO2层覆盖在NCM811的表面。控制涂层的退火温度以提高电化学性能。在 600℃ 退火的 TiO2 涂层 NCM811 阴极在 0.1 C 的电流倍率下循环 100 次后显示出 104.9% 的最佳容量保持率,而原始 NCM811 的容量保持率为 64.1%,在 500℃ 退火的涂层样品为 96.7%。
Ni-rich LiNi0.8Co0.1Mn0.1O2(NCM811) cathode particles were coated with anatase TiO2layer to improve its cycle stability. The TiO2coating 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 TiO2coating process. The nanothick anatase TiO2layer 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 ℃.
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