Abstract LiNi0.8Co0.1Mn0.1O2 cathode materials coated with MoO3 were synthesized via drying coating process with low velocity ball milling. The crystal structure and particle morphology of the sample were examined and observed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the surface modification had a little change on the samples and illustrated that the components of the coating layer were MoO3/Li2MoO4. Electrochemical results demonstrated that the MoO3 coated samples exhibited preeminent electrochemical performance compared with the bare samples. Particularly for the 3 wt% MoO3 coated samples, its initial coulombic efficiencies increased from 83.3% to 89.0%. Furthermore, the 3 wt% MoO3 coated samples exhibited the highest capacity retention of 94.8% after 100 cycles at 1 C, and possessed the excellent rate discharge performance at a high current density. The electrochemical impedance spectroscopy and cyclic voltammetric results suggested that the layered MoO3 coating could suppress the augmenter of the charge transfer resistance and stabilize the active material structure during cyclic process.

中文翻译：

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通过锂活性 MoO 3 表面改性提高 LiNi 0.8 Co 0.1 Mn 0.1 O 2 的电化学性能

摘要 采用低速球磨干燥包覆工艺合成了MoO3包覆的LiNi0.8Co0.1Mn0.1O2正极材料。通过X射线衍射、扫描电镜和透射电镜对样品的晶体结构和颗粒形貌进行了检查和观察。结果表明，样品表面改性变化不大，说明涂层组分为MoO3/Li2MoO4。电化学结果表明，与裸样品相比，MoO3 涂层样品表现出卓越的电化学性能。特别是对于 3 wt% MoO3 涂层样品，其初始库仑效率从 83.3% 增加到 89.0%。此外，3 wt% MoO3 涂层样品在 1 C 下循环 100 次后表现出最高的容量保持率为 94.8%，并在高电流密度下具有优异的倍率放电性能。电化学阻抗谱和循环伏安结果表明，层状MoO3涂层可以抑制电荷转移电阻的增强，并在循环过程中稳定活性材料结构。